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nist-gov/www.nist.gov/ncnr/nicesoftware/nice-help/trajectory-guide/3-trajectory-reference/file-rule
Scott Williams 4063bef310 Initital commit.
2025-03-05 18:59:57 +00:00

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<h1 class="nist-page__title">File Rule</h1>
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<h2>Basics&nbsp;&nbsp;</h2>
<p>Trajectories&nbsp;perform 3 core tasks:&nbsp;</p>
<ol>
<li>Visit a series of instrument states. Each state can be comprised of motor positions, temperatures, etc.&nbsp;</li>
<li>Perform a count at each state&nbsp;</li>
<li>Store the results&nbsp;</li>
</ol>
<p>Trajectories allow you to&nbsp;configure&nbsp;how step 3 (store the results) is performed. In particular:&nbsp;</p>
<ul>
<li>When data files are created.</li>
<li>How data files are named.</li>
<li>How data is arranged within/across data files.</li>
</ul>
<p>Additionally,&nbsp;NICE can write data to multiple formats simultaneously. Two common&nbsp;formats&nbsp;are:&nbsp;</p>
<ul>
<li>column&nbsp;–&nbsp;A tabular&nbsp;text&nbsp;format.</li>
<li>NEXUS&nbsp;–&nbsp;A common neutron scatter format for organizing data. NICE uses the&nbsp;Hierarchical Data Format (HDF)&nbsp;binary flavor.&nbsp;</li>
</ul>
<blockquote>
<p>NOTE: Trajectories do not allow you to configure&nbsp;active writers (which data formats are written), but this is changeable and is described here:&nbsp;<a href="https://www.nist.gov/ncnr/nicesoftware/nice-help/writers">Writers</a>.</p>
</blockquote>
<p>Each data format is governed by a “writer” (a small python program) which is responsible for the details of how data is written.&nbsp;Users can&nbsp;describe&nbsp;how they want writers to store&nbsp;a trajectory’s&nbsp;data by providing “hints” in the form of&nbsp;“file rules” (specified by&nbsp;setting special variables).&nbsp;For example, a user&nbsp;could provide a hint by setting the&nbsp;variable&nbsp;<em>fileName</em>&nbsp;=&nbsp;“myfile”, which would result in the&nbsp;NEXUS writer producing the&nbsp;<em>myfile.nxs.&lt;INT&gt;</em>&nbsp;file&nbsp;and the column writer producing the&nbsp;<em>myfile.&lt;INT&gt;</em>.&nbsp;file, where&nbsp;<em>&lt;INT&gt;</em>&nbsp;represents a unique&nbsp;3-letter&nbsp;instrument tag.&nbsp;</p>
<blockquote>
<p>NOTE: Setting filename directly is&nbsp;NOT&nbsp;a wise idea. This is explained in more detail&nbsp;in <strong>Example 1</strong>.&nbsp;</p>
</blockquote>
<p>At&nbsp;various&nbsp;times, while a&nbsp;trajectory&nbsp;is&nbsp;executing&nbsp;each point (move&nbsp;+&nbsp;count) it broadcasts the instrument state, counts and sends trajectory variables to each active writer.&nbsp;Unlike other trajectory variables, file rules are&nbsp;expressions, which are defined once and&nbsp;automatically&nbsp;re-evaluated per point,&nbsp;before data is sent to each writer.&nbsp;Understanding available file rule variables and using more complex formulas will allow you&nbsp;to&nbsp;arrange and distribute data across files in any desired&nbsp;manner. For simplicity, we&nbsp;will&nbsp;focus solely on the&nbsp;output of the&nbsp;NEXUS&nbsp;writer&nbsp;in the examples below, but the concepts discussed extend to all writers/formats.&nbsp;&nbsp;</p>
<h3>Example 1&nbsp;</h3>
<p>Here is a trajectory which visits the following temperatures:&nbsp;[100,125,150,175,200]. At each&nbsp;iteration, the trajectory&nbsp;goes through&nbsp;two polarization states [UP,&nbsp;DOWN]&nbsp;for a total of 10 points.&nbsp;At each point, we will count for&nbsp;fixed period of&nbsp;5 seconds.&nbsp;&nbsp;</p>
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<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2020/03/20/1.png?itok=qaevPYHp" data-media-id="575621">
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<figcaption class="nist-image__caption"></figcaption>
</figure>
<p><span><span><span><span><span><span>We set the&nbsp;<em>fileName&nbsp;</em>expression&nbsp;to be “TestingH20”, which evaluates to the fixed value “TestingH20” at every point. Not surprisingly, all data points are written to one data file named&nbsp;“TestingH20”:&nbsp;</span></span></span></span></span></span></p>
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</figure>
<p><span><span><span><span><span><span>While this looks like a reasonable scheme,&nbsp;if you rerun the same trajectory,&nbsp;<em>fileName</em>&nbsp;will still evaluate to&nbsp;the same&nbsp;“TestingH20<em>”&nbsp;</em>name, causing the writers to&nbsp;deal with possible name collisions.&nbsp;</span></span></span></span></span></span></p>
<p><span><span><span><span><span><span>To improve&nbsp;this scheme, we can change the&nbsp;<em>fileName&nbsp;</em>expression to be:&nbsp;</span></span></span></span></span></span></p>
<blockquote>
<p><span><span><span><span><em><span><span>fileName&nbsp;=&nbsp;“</span></span></em><span><span>TestingH20</span></span><em><span><span>”&nbsp;+&nbsp;fileNum</span></span></em>&nbsp;</span></span></span></span></p>
</blockquote>
<p><span><span><span><span><span><span>where&nbsp;<em>fileNum</em>&nbsp;is a special variable&nbsp;that&nbsp;can be attached to the end of the file name.&nbsp;It&nbsp;automatically increments&nbsp;every time a&nbsp;trajectory&nbsp;is run</span></span><span><span>.</span></span></span></span></span></span></p>
<p><span><span><span><span><span><span>Every time we run the same trajectory, a data&nbsp;file will be generated with a new name:&nbsp;the provided name&nbsp;<em>“</em>TestingH20<em>”</em>&nbsp;followed&nbsp;by an incrementing integer:&nbsp;</span></span></span></span></span></span></p>
<blockquote>
<p><span><span><span><span><em><span><span>TestingH20</span></span></em><em><span><span><span>1</span></span></span></em><em><span><span>.nxs</span></span></em>&nbsp;</span></span></span></span></p>
<p><span><span><span><span><em><span><span>TestingH20</span></span></em><em><span><span><span>2</span></span></span></em><em><span><span>.nxs</span></span></em>&nbsp;</span></span></span></span></p>
<p><span><span><span><span><em><span><span>TestingH20</span></span></em><em><span><span><span>&lt;i&gt;</span></span></span></em><em><span><span>.nxs</span></span></em>&nbsp;</span></span></span></span></p>
</blockquote>
<p><span><span><span><span><span><span>After all this, it turns out you’ll get similar behavior&nbsp;if you simply don’t&nbsp;use&nbsp;<em>fileName&nbsp;</em>at all! The reason is that NICE provides several defaults:&nbsp;</span></span></span></span></span></span></p>
<ul>
<li><span><span><span><span><span><em><span><span>fileName&nbsp;=&nbsp;filePrefix&nbsp;+&nbsp;fileNum</span></span></em>&nbsp;</span></span></span></span></span></li>
<li><span><span><span><span><span><em><span><span>filePrefix&nbsp;=&nbsp;trajNam</span></span></em><span><span>e&nbsp;</span></span></span></span></span></span></span></li>
<li><span><span><span><span><span><em><span><span>trajName&nbsp;= &lt;the&nbsp;base&nbsp;name of the trajectory file being run&gt;</span></span></em>&nbsp;</span></span></span></span></span></li>
</ul>
<blockquote>
<p><span><span><span><span><span><span><span>NOTE: Technically&nbsp;<em>fileName</em>&nbsp;= "</span></span></span><strong><span><span><span>String(filePrefix) + String(fileNum)</span></span></span></strong><span><span><span>"&nbsp;</span></span></span><span><span>which effectively concatenates&nbsp;<em>filePrefix</em>&nbsp;and&nbsp;<em>fileNum</em>&nbsp;(formally defaults to&nbsp;"sprintf('%s%d',filePrefix,fileNum)").&nbsp;</span></span></span></span></span></span></p>
</blockquote>
<p><span><span><span><span><span><span>So, if&nbsp;you don’t&nbsp;specify any rules whatsoever,&nbsp;running the same trajectory&nbsp;(stored as&nbsp;<em>test.trj</em>)&nbsp;would&nbsp;generate the following data files:&nbsp;</span></span></span></span></span></span></p>
<blockquote>
<p><em><span><span><span><span><span><span>test1.nxs&nbsp;</span></span></span></span></span></span></em></p>
<p><em><span><span><span><span><span><span>test2.nxs&nbsp;</span></span></span></span></span></span></em></p>
<p><em><span><span><span><span><span><span>test&lt;i&gt;.nxs&nbsp;</span></span></span></span></span></span></em></p>
</blockquote>
<blockquote>
<p><span><span><span><span><span><span>NOTE: It’s at discretion of each writer to decide what to do about file name collision. The NEXUS writer avoids collisions by modifying&nbsp;the&nbsp;original file name; It appends character sequence <em>&lt;_Ai&gt;</em> where&nbsp;i&nbsp;represents an increment of how many times the file with this name has been stored on disk.</span></span>&nbsp;</span></span></span></span></p>
</blockquote>
<p><span><span><span><span><span><span>Example:</span></span>&nbsp;</span></span></span></span></p>
<blockquote>
<p><span><span><span><span><em><span><span>TestingH20.nxs</span></span></em>&nbsp;</span></span></span></span></p>
<p><span><span><span><span><em><span><span>TestingH20_A1.nxs</span></span></em>&nbsp;</span></span></span></span></p>
<p><span><span><span><span><em><span><span>TestingH20_A2.nxs</span></span></em>&nbsp;</span></span></span></span></p>
</blockquote>
<p><span><span><span><span><span><span>Other writers might append data to the same file, so it’s wise to not rely on this.</span></span>&nbsp;</span></span></span></span></p>
<h3><span><span><span><span><strong><span><span>Example 2</span></span></strong>&nbsp;</span></span></span></span></h3>
<p><span><span><span><span><span><span>Let’s now concentrate on how we can organize data&nbsp;within a running&nbsp;trajectory.&nbsp;Let’s reuse our&nbsp;original trajectory from <strong>Example 1</strong>,&nbsp;which visits the following temperatures [100,125,150,175,200] and at each iteration goes through two polarization states [UP,&nbsp;DOWN],&nbsp;for a total of 10 points.</span></span></span></span></span></span></p>
<p><span><span><span><span><span><span>What if a user wants each measurement to go into a separate file based on the&nbsp;temperature&nbsp;value?&nbsp;This can be accomplished by setting&nbsp;<em>filePrefix&nbsp;</em>to the following&nbsp;expression:&nbsp;</span></span></span></span></span></span></p>
<blockquote>
<p><span><span><span><span><em><span><span>filePrefix&nbsp;</span></span></em><span><span>= "temp<em>_" +</em></span></span><em>&nbsp;</em><em><span><span>temp</span></span></em><em>&nbsp;</em><em><span><span>+</span></span></em><em>&nbsp;"_</em><em><span><span>"</span></span></em></span></span></span></span></p>
</blockquote>
<p><span><span><span><span>If we assume&nbsp;<em>fileNum&nbsp;</em>had reached 4 before the trajectory was run, then <em>fileNum</em> would be incremented to 5. The output would&nbsp;include 5 different files&nbsp;based on temp&nbsp;value.</span></span></span></span></p>
<figure class=" nist-image--lightbox nist-image" role="group">
<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2020/03/20/3.png?itok=V05bEuCB" data-media-id="575631">
<img alt="filerule3" height="186" loading="lazy" src="/sites/default/files/images/2020/03/20/3.png" typeof="foaf:Image" width="403">
</div>
<figcaption class="nist-image__caption"></figcaption>
</figure>
<p><span><span><span><span><span><span>It’s important to note that&nbsp;our files were named using the&nbsp;desired&nbsp;value&nbsp;<em>temp</em>, as&nbsp;evaluated&nbsp;in the trajectory, and&nbsp;<strong>NOT</strong>&nbsp;the&nbsp;value of&nbsp;temperature that was&nbsp;achieved. This&nbsp;is generally preferred as it </span></span><span>results in consistent and predictable file names.&nbsp;</span></span></span></span></span></p>
<p><span><span><span><span><span>It’s also important to note that&nbsp;even though&nbsp;device and node names are not case sensitive,&nbsp;variable&nbsp;names&nbsp;in trajectories are.<em>&nbsp;</em>When&nbsp;users&nbsp;manipulate the “temp” device in a trajectory,&nbsp;that name essentially becomes a variable in&nbsp;the JavaScript&nbsp;engine.&nbsp;JavaScript&nbsp;is <strong>case-sensitive</strong>, and users must use consistent capitalization, or the results will be unpredictable.&nbsp;</span></span></span></span></span></p>
<h3><span><span><span><span><strong><span>Example 3</span></strong></span></span></span></span></h3>
<p><span><span><span><span><span>The NEXUS&nbsp;writer allows for&nbsp;storage of several&nbsp;scans in the same file&nbsp;as separate entries defined by&nbsp;<em>entryName</em>.&nbsp;If unspecified, then&nbsp;</span><em><span>entryName</span></em>&nbsp;defaults to an&nbsp;empty&nbsp;string <span>in the editor. The writer would then store all the data under a default entry named "entry".</span></span></span></span></span></p>
<p><span><span><span><span><span><span>Let’s&nbsp;redefine the above trajectory to store the points in&nbsp;five&nbsp;files,&nbsp;with each file containing&nbsp;two&nbsp;entries based&nbsp;on the polarization&nbsp;state: “UP” or “DOWN”.&nbsp;</span></span></span></span></span></span></p>
<p><span><span><span><span><span><span>Here is an example of the&nbsp;desired&nbsp;NEXUS hierarchy&nbsp;for one file:</span></span></span></span></span></span></p>
<ul>
<li><em><span><span><span><span><span><span>temp_150_5.nxs&nbsp;</span></span></span></span></span></span></em>
<ul>
<li><span><span><span><span><span><span>DOWN&nbsp;&nbsp;</span></span></span></span></span></span></li>
<li><span><span><span><span><span><span>UP&nbsp;&nbsp;</span></span></span></span></span></span></li>
</ul>
</li>
</ul>
<p><span><span><span><span><span><span>Here is how the expressions would be set up to achieve this:&nbsp;</span></span></span></span></span></span></p>
<figure class=" nist-image--lightbox nist-image" role="group">
<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2020/03/20/4.png?itok=YhW5RYbM" data-media-id="575636">
<img alt="filerule4" height="188" loading="lazy" src="/sites/default/files/images/2020/03/20/4.png" typeof="foaf:Image" width="402">
</div>
<figcaption class="nist-image__caption"></figcaption>
</figure>
<blockquote>
<p><span><span><span><span><em><span><span>filePrefix&nbsp;</span></span></em><span><span>= "temp_" + temp + "_"&nbsp;</span></span></span></span></span></span></p>
<p><span><span><span><span><em><span><span>entryName</span></span></em><span><span>=&nbsp;<em>frontPolarization&nbsp;&nbsp;</em></span></span></span></span></span></span></p>
</blockquote>
<blockquote>
<p><span><span><span><span><span><span>NOTE:&nbsp;While inspired by NEXUS, all writers can observe the&nbsp;<em>entryName</em>&nbsp;rule and it is at each writer’s discretion what is done with it. Some writers may use the rule, while others may ignore it. Please see the section on </span></span></span></span></span></span><a href="https://www.nist.gov/ncnr/nicesoftware/nice-help/writers">Writers</a><span><span><span><span><span><span> for more&nbsp;details.&nbsp;&nbsp;</span></span></span></span></span></span></p>
</blockquote>
<h3><span><span><span><span><strong><span><span>Example 4</span></span></strong></span></span></span></span></h3>
<p><span><span><span><span><span><span>As demonstrated in the previous example, a trajectory can move a node like <em>temp</em>&nbsp;through a series of desired values and further use these desired values in formulas and file expressions. However, what if we want to use a node’s current value in the file name? We cannot do that because trajectories cannot access the “live” value of a node as it changes during the </span></span><span>trajectory’s execution. What is available to trajectories is a snapshot of initial node states, as they were,&nbsp;right before the trajectory started execution. These values can be accessed via the&nbsp;<em>start</em>&nbsp;prefix (formally&nbsp;</span><span>known as <em>live</em>)&nbsp;followed by the full node name (for example:&nbsp;<em>start.lakeshore340.primaryNode</em>). &nbsp;</span></span></span></span></span></p>
<p><span><span><span><span><span>Let’s&nbsp;revisit the&nbsp;trajectory we’ve <span>been using in the past several examples and make a few changes.&nbsp;Firstly, let’s name our files based on the sample we’re using, rather than simply making it&nbsp;“temp”. This assumes the current sample has already been configured and has a been given a name (the current sample’s name is stored in the node&nbsp;<em>sample.name)</em>.&nbsp;</span></span></span></span></span></span></p>
<p><span><span><span><span><span><span>We’ll change the </span></span><span>rule for&nbsp;filePrefix&nbsp;to be:&nbsp;</span></span></span></span></span></p>
<blockquote>
<p><span><span><span><span><em><span>filePrefix&nbsp;</span></em><span>=&nbsp;<em>start.sample</em><span><em>.name</em> + "_temp_" + <em>temp</em> + "_"&nbsp;</span></span></span></span></span></span><span><span><span><span>&nbsp;</span></span></span></span></p>
</blockquote>
<figure class=" nist-image--lightbox nist-image" role="group">
<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2020/03/20/5.png?itok=Nhsi6uo2" data-media-id="575646">
<img alt="filerule5" height="187" loading="lazy" src="/sites/default/files/images/2020/03/20/5.png" typeof="foaf:Image" width="396">
</div>
<figcaption class="nist-image__caption"></figcaption>
</figure>
<h3><span><span><span><span><strong><span><span>Example&nbsp;5</span></span></strong></span></span></span></span></h3>
<p><span><span><span><span><span>In the previous examples we wanted to put data associated with each distinct temperature into their own files. To do this, we made <em>fileName</em>&nbsp;a function of temperature.&nbsp;</span><span><span>This worked for those&nbsp;examples, but what if the desired temperatures were long, decimal values? What if many changing states, like magnet fields or motor positions, were combined to create a file name? We can imagine ending up with an awkward file name like:</span></span>&nbsp;</span></span></span></span></p>
<blockquote>
<p><span><span><span><span><em><span><span>myFile_temp_127.125_mag_4.0625_motorX_20.45.nxs.&lt;INT&gt;</span></span></em></span></span></span></span></p>
</blockquote>
<p><span><span><span><span><span><span>So, the question is: how can we group data, based on common states like temperature, but not be forced to include temperature in the name of a file?</span></span>&nbsp;</span></span></span></span></p>
<figure class=" nist-image--lightbox nist-image" role="group">
<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2020/03/20/6.png?itok=x-j1bGuO" data-media-id="575651">
<img alt="filerule6" height="187" loading="lazy" src="/sites/default/files/images/2020/03/20/6.png" typeof="foaf:Image" width="462">
</div>
<figcaption class="nist-image__caption"></figcaption>
</figure>
<p><span><span><span><span><span><span>The answer is to use the</span></span><em><span><span>&nbsp;fileGroup&nbsp;</span></span></em><span><span>expression.&nbsp;At every point, the trajectory engine will check if&nbsp;<em>fileGroup</em>&nbsp;has changed and, if so, will increment&nbsp;<em>fileN</em></span></span><em><span>um</span></em><span>. Otherwise,&nbsp;the trajectory engine will pick the&nbsp;<em>fileNum&nbsp;</em>associated with&nbsp;the existing&nbsp;<em>fileGroup</em>. B<span>y&nbsp;default,&nbsp;<em>fileGroup</em>&nbsp;is empty – and in all the examples above,&nbsp;<em>fileGroup</em>&nbsp;was always empty and unchanging, and so&nbsp;<em>fileNum&nbsp;</em>was only incremented&nbsp;once&nbsp;per </span>trajectory.</span></span></span></span></span></p>
<p><span><span><span><span><span>Let’s change our original trajectory a bit more. In this example, we&nbsp;decided to visit the following temperatures: [100,125,150,175,100,200] and at each iteration&nbsp;go&nbsp;through two polarization states [UP, DOWN] for a total of 12&nbsp;points.&nbsp;</span></span></span></span></span></p>
<figure class=" nist-image--lightbox nist-image" role="group">
<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2020/03/20/7.PNG?itok=zIIAoWbh" data-media-id="575666">
<img alt="filerule7" height="275" loading="lazy" src="/sites/default/files/images/2020/03/20/7.PNG" typeof="foaf:Image" width="689">
</div>
<figcaption class="nist-image__caption"></figcaption>
</figure>
<p><span><span><span><span><span>Since&nbsp;<em>fileName&nbsp;</em>now depends on <em>fileGroup</em>,&nbsp;notice that&nbsp;the second time temperature reached 100.0 K,&nbsp;at point 9,&nbsp;the data was written to the same data file&nbsp;as in point 1, [FeNi7]. Also, when a new&nbsp;<em>fileGroup&nbsp;</em>was added for 200.0K&nbsp;at point 11, the&nbsp;<em>fileNum&nbsp;</em>incremented again, hence the <em>fileName</em>, [FeNi11].</span></span></span></span></span></p>
<p><span><span><span><span><span>To produce&nbsp;similar output to that&nbsp;above,&nbsp;we can use the following file rules:&nbsp;</span></span></span></span></span><span><span><span><span>&nbsp;</span></span></span></span></p>
<blockquote>
<p><em><span><span><span><span><span>filePrefix&nbsp;=&nbsp;start.sample<span>.name&nbsp;</span></span></span></span></span></span></em></p>
<p><em><span><span><span><span><span><span>entryName=&nbsp;frontPolarization&nbsp;</span></span></span></span></span></span></em></p>
<p><em><span><span><span><span><span><span>fileGroup&nbsp;= temp</span></span></span></span></span></span></em></p>
</blockquote>
<p><span><span><span><span><span><span>The exact names of files will depend on the initial value of the&nbsp;<em>fileNum</em>&nbsp;variable.</span></span></span></span></span></span></p>
<p>&nbsp;</p>
<h3><span><span><span><span><strong><span><span>Example 6</span></span></strong></span></span></span></span></h3>
<p>If the users are interested in manipulating several samples in the same trajectory and record corresponding sample information in the file name then they would have to follow special rules.&nbsp; We have changed how samples are stored on the server, they are no longer represented as a device, but as a table stored in persistent configuration. As a result trajectories need to handle this case separately.&nbsp; Imagine a trajectory that goes through several samples and at each sample changes the temperature.</p>
<p>loop sampleId (1,2,3)</p>
<p>&nbsp; &nbsp;loop temp (300,350,400)</p>
<p>Also lets assume that the user wants data for each sample to be stored in a separate data file. In other words, we will have three files named after each sample name with three data points in it.</p>
<p>Important node: before each trajectory runs, it stores almost all of the instrument state in the variable called start (see example 4 for details).&nbsp; The start variable also incudes the entire sample table.&nbsp; It can be accessed by calling <em>start.sampleTable.&nbsp; For example, sample 1 info can be accessed by calling&nbsp;&nbsp;start.sampleTable(1) followed by the name of the property.&nbsp;</em>Hence, we can describe file name by the following rule:</p>
<p><span><span><span>filePrefix =&nbsp;</span></span></span><span><span><span>"<span>start.sampleTable.get(parseInt(sampleId)).get('name')</span>"</span></span></span></p>
<p>Here is the corresponding dryrun result:</p>
<div class="align-center nist-image--lightbox nist-image" data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2023/04/19/sampleId_trajectory.png?itok=JjvpFIy7" data-media-id="671661">
<img loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2023/04/19/sampleId_trajectory.png?itok=6mYrk0Vi" width="351" height="200" alt="sample id trajectory dryrun" typeof="foaf:Image">
</div>
<p>&nbsp;</p>
<h2>Appendix</h2>
<h3>File Variables&nbsp;</h3>
<p>These are special, read-only&nbsp;keywords&nbsp;maintained by the trajectory engine, which can&nbsp;be&nbsp;used&nbsp;to construct file&nbsp;expressions.&nbsp;</p>
<p><strong>fileNum</strong>&nbsp;</p>
<ul>
<li>represents a counter; every time&nbsp;a point is about to count,&nbsp;it checks if&nbsp;a new&nbsp;<strong>fileGroup</strong>&nbsp;is available&nbsp;and increments&nbsp;<strong>fileNum</strong>.</li>
<li>While the trajectory is running,&nbsp;if a&nbsp;<strong>fileGroup</strong>&nbsp;never changes, then the counter only increments once.</li>
<li>It resets&nbsp;back to&nbsp;zero for every new experiment.&nbsp;</li>
</ul>
<p><strong>instFileNum</strong>&nbsp;</p>
<ul>
<li>the same as<strong>&nbsp;fileNum</strong>, except that it does not reset for every new&nbsp;experiment.</li>
<li>In practice this should increment forever.&nbsp;</li>
</ul>
<p><strong>pointNum</strong>&nbsp;</p>
<ul>
<li>starts at zero for each new&nbsp;trajectory and increments once per&nbsp;point.&nbsp;</li>
</ul>
<p><strong>expPointNum</strong>&nbsp;</p>
<ul>
<li>starts at zero for each new&nbsp;experiment and increments once per&nbsp;point.</li>
<li>Switching to an old&nbsp;experiment will not reset&nbsp;<strong>expPointNum</strong>.&nbsp;</li>
</ul>
<h3>File Expressions&nbsp;</h3>
<p><strong>fileName</strong>&nbsp;</p>
<ul>
<li>is the final value used by writers to construct file names.&nbsp;&nbsp;</li>
<li>Default:&nbsp;"String(filePrefix) + String(fileNum)"&nbsp;</li>
<li>If&nbsp;overwritten, this can cause name collisions&nbsp;when&nbsp;the same trajectory runs again.&nbsp;</li>
<li>Can be specified per instrument to be displayed in the editor.&nbsp;&nbsp;</li>
</ul>
<p><strong>filePrefix</strong>&nbsp;</p>
<ul>
<li>can be specified instead of&nbsp;<strong>fileName</strong>&nbsp;to guarantee&nbsp;uniqueness&nbsp;of the data files.&nbsp;</li>
<li>Default:&nbsp;<em>filePrefix&nbsp;=&nbsp;trajName&nbsp;</em></li>
<li>Can be specified per instrument to be displayed in the editor.&nbsp;&nbsp;</li>
</ul>
<p><strong>trajName</strong>&nbsp;</p>
<ul>
<li>specifies&nbsp;the trajectory&nbsp;file base name.</li>
<li>The value is&nbsp;not explicitly exposed in the editor&nbsp;and should generally&nbsp;not be&nbsp;overwritten.&nbsp;</li>
</ul>
<p><strong>description</strong>&nbsp;</p>
<ul>
<li>metadata that describes trajectory.</li>
<li>Is empty by default.</li>
</ul>
<p><strong>entryName</strong>&nbsp;</p>
<ul>
<li>defines the format for entries for&nbsp;NEXUS&nbsp;data files, by default is set to "" (an empty string).</li>
<li>can&nbsp;be specified per&nbsp;instrument&nbsp;to be displayed in the editor.&nbsp;&nbsp;</li>
<li>Default: empty string</li>
</ul>
<p><strong>fileGroup</strong>&nbsp;</p>
<ul>
<li>defines a trigger for&nbsp;incrementing&nbsp;<strong>fileNum</strong>.
<ul>
<li>A list of evaluated&nbsp;<strong>fileGroups</strong>&nbsp;will be maintained per&nbsp;trajectory and reset every time a new one starts.</li>
<li>By default,&nbsp;<strong>fileGroup</strong>&nbsp;is empty&nbsp;and does not change;&nbsp;therefore,&nbsp;<strong>fileNum</strong>&nbsp;increments&nbsp;only once per trajectory.&nbsp;</li>
</ul>
</li>
<li>SANS instruments can take advantage of this feature.
<ul>
<li>In a typical trajectory, every point needs to write to a new data file. It can be accomplished by&nbsp;making&nbsp;<strong>fileGroup</strong>&nbsp;change at every point:&nbsp;<em>fileGroup&nbsp;=&nbsp;pointNum</em>.</li>
</ul>
</li>
<li>Can be specified per instrument to be displayed in the editor.&nbsp;&nbsp;</li>
<li>Default: empty string&nbsp;</li>
</ul>
<h3>Default File Rules&nbsp;</h3>
<p>The following default file rules are used if not explicitly defined in a trajectory:&nbsp;</p>
<blockquote>
<p><em>fileName&nbsp;=&nbsp;filePrefix&nbsp;+&nbsp;fileNum</em>&nbsp;</p>
<p><em>filePrefix&nbsp;=&nbsp;</em><em>trajNam</em>e&nbsp;</p>
<p><em>entryName&nbsp;=&nbsp;</em>empty string&nbsp;</p>
<p><em>fileGroup&nbsp;= </em>empty string&nbsp;</p>
</blockquote>
<p>Whenever a new trajectory is created through the NICE editor, file rule expressions are explicitly set to default values as determined by the instrument scientist. However, it is still possible for these file rules to be undefined given that:&nbsp;</p>
<ul>
<li>Older trajectories may not&nbsp;have&nbsp;defined&nbsp;these expressions explicitly.&nbsp;</li>
<li>A&nbsp;user may delete&nbsp;these expressions in the editor.</li>
<li>A user may create a trajectory outside the NICE editor.</li>
</ul>
</div>
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Created December 7, 2018, Updated April 19, 2023
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