ng a 3x3 matrix. The values are in column order:<br></p>

<figure  class='ruff-snippet ruff-figure'><pre class='ruff'>
<span style="color: hsl(206, 98.02%, 29.04%);font-weight: 550;">set</span> matrix {
  a d g
  b e h
  c f i
}
</pre>

</figure><h5 class='ruff'>Return value</h5><p class='ruff'>Nothing.</p>
<h3 class='ruffproc'><a name='::pix::ctx::stroke'>stroke</a><span class='ns_scope'> [<a href="pix-pix-ctx.html#::pix::ctx" title="::pix::ctx" class='ruff_cmd'>::pix::ctx</a>]</span><span class='ruff-upli