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<pl-question-panel>
  <p>
    The questions below were designed to showcase the different features of
    <a href="https://docs.prairielearn.com/elements/pl-variable-output"
      ><code>pl-variable-output</code></a
    >. The goal of
    <a href="https://docs.prairielearn.com/elements/pl-variable-output"
      ><code>pl-variable-output</code></a
    >
    is to allow users to easily copy parameters (scalar values or 2D matrices) for various
    computational tools.
  </p>
</pl-question-panel>

<pl-card>
  <pl-question-panel>
    <p>
      Within this question, you can observe the default behavior of the
      <a href="https://docs.prairielearn.com/elements/pl-variable-output"
        ><code>pl-variable-output</code></a
      >
      element. In particular, the default matrix output has Matlab, Mathematica, and NumPy tabs.
      The default active tab is Matlab, this can be changed using the attribute
      <code>default-tab</code>. This element has the ability to display any 2D matrix or scalar
      value and they are displayed with <code>2</code> digits after the decimal.
    </p>
  </pl-question-panel>
  <pl-variable-output>
    <!-- Comments are allowed here! -->
    <pl-variable params-name="a">a</pl-variable>
    <pl-variable params-name="d">d</pl-variable>
    <pl-variable params-name="x">x</pl-variable>
    <pl-variable params-name="x1">x1</pl-variable>
    <pl-variable params-name="x2">x2</pl-variable>
  </pl-variable-output>
</pl-card>

<pl-card>
  <pl-question-panel>
    <p>
      This example lowers the number of displayed digits to <code>0</code> for the entire element
      and introduces comments for each variable. This uses the optional element parameter
      <code>digits</code>.
    </p>
  </pl-question-panel>
  <pl-variable-output digits="0">
    <pl-variable params-name="x" comment="This is an array">x</pl-variable>
    <pl-variable params-name="x1" comment="This is a 2D matrix">x1</pl-variable>
  </pl-variable-output>
</pl-card>

<pl-card>
  <pl-question-panel>
    <p>
      Under this variant, we opt to change the number of displayed digits to <code>0</code> for
      the entire element, but explicitly specify <code>8</code> digits for the real number
      <code>d</code> and <code>2</code> digits for <code>c</code> and <code>xC</code> . This uses
      the optional variable parameter <code>digits</code>.
    </p>
  </pl-question-panel>
  <pl-variable-output digits="0">
    <pl-variable params-name="a">a</pl-variable>
    <pl-variable params-name="b">b</pl-variable>
    <pl-variable params-name="d" digits="8">d</pl-variable>
    <pl-variable params-name="c" digits="2">c</pl-variable>
    <pl-variable params-name="xC" digits="2">xC</pl-variable>
  </pl-variable-output>
</pl-card>

<pl-card>
  <pl-question-panel>
    <p>
      The variables in the Mathematica tab are reformatted if they are reserved in Mathematica (C,
      D, E, I, K, N, O). These reserved variables are appended with an <code>'m'</code> in the
      Mathematica tab <strong>only</strong>.
    </p>
  </pl-question-panel>
  <pl-variable-output digits="0">
    <pl-variable params-name="x" comment="The Mathematica tab adds an 'm' to the variable name"
      >C</pl-variable
    >
    <pl-variable params-name="x1">D</pl-variable>
    <pl-variable params-name="b">E</pl-variable>
    <pl-variable params-name="a">I</pl-variable>
    <pl-variable params-name="b">K</pl-variable>
    <pl-variable params-name="a">N</pl-variable>
    <pl-variable params-name="b">O</pl-variable>
  </pl-variable-output>
</pl-card>

<pl-card>
  <pl-question-panel>
    <p>
      The default active tab is Matlab, in this example the default active tab is NumPy. This is
      done by setting the optional parameter <code>default-tab="numpy"</code>.
    </p>
  </pl-question-panel>

  <pl-variable-output digits="0" default-tab="numpy">
    <pl-variable params-name="x1">x1</pl-variable>
  </pl-variable-output>

  <p>
    All computational languages are displayed by default. These can be turned off using the
    element attributes <code>show-matlab</code>, <code>show-mathematica</code>,
    <code>show-numpy</code>, and <code>show-r</code>. In this example, we remove the the Matlab
    tab. The default active tab will be the first one in the list, in this case: Mathematica.
  </p>

  <pl-variable-output digits="0" show-matlab="false">
    <pl-variable params-name="x1">x1</pl-variable>
  </pl-variable-output>

  <p>
    When a tab is not displayed, the default active tab can still be set. In this case, the
    Mathematica tab is hidden and NumPy is set as the default active tab.
  </p>

  <pl-variable-output digits="8" show-mathematica="false" default-tab="numpy">
    <pl-variable params-name="d">d</pl-variable>
  </pl-variable-output>

  <p>
    Any tab can be displayed alone. In this case, the Matlab, Mathematica, and R tabs are hidden
    and the NumPy tab is displayed alone.
  </p>

  <pl-variable-output digits="0" show-matlab="false" show-mathematica="false" show-r="false">
    <pl-variable params-name="x1">x1</pl-variable>
  </pl-variable-output>
</pl-card>