Prefigure not rendering live

[Mark Fitch]

The prefigure diagram (code below) renders correctly in the Prefigure playground, but the function does not show up when I deploy it.

It is the sixth image (center row, right entry at http://www.math.uaa.alaska.edu/~afmaf/classes/math251/lessons/section-limits-discover.html#figure-limits-exists-2-1-1)

<diagram dimensions="(300,300)" margins="5">

<definition>f(t) = sqrt(abs(t-4))</definition>

<coordinates bbox="[-1,-0.2,8,2]">

<axes xlabel="t" ylabel="h(t)"

  hticks="(0,1,8)" hlabels="(0,1,8)"

  vticks="(0,0.2,2)" vlabels="(0,0.2,2)"

  arrows="0"/>

<line at="guide" endpoints="((4,0),(4,2))" stroke="blue" />

<graph at="graph_left" function="f" domain="(0,4)" stroke="lightgreen" thickness="2" />

<graph at="graph_right" function="f" domain="(4,8)" stroke="lightgreen" thickness="2" />

</coordinates>

<annotations>

<annotation ref="figure" text="The graph of a function">

<annotation ref="graph_left" text="The curve begins at the top left curves down to (4,0)." sonify="yes" />

<annotation ref="graph_right" text="To the right of this it is a mirror image. At (4,0) the curve makes a sharp turn." sonify="yes" />

<annotation ref="guide" text="Vertical line at t equals 4 guiding you toward the curve" />

</annotation>

</annotations>

</diagram>

Dr. Mark A. Fitch
Professor of Mathematics
Overseer, Associate of Arts/Science

maf...@alaska.edu
SSB 154
University of Alaska Anchorage
3211 Providence Drive, Anchorage, AK 99508

[David Austin]

Hi Mark,

I just dropped this into one of my projects, and everything turned out well.  Would you mind sharing your source code?

David

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[Mark Fitch]

The code is at: https://github.com/mafitch/calculus1.git

This part is in limits_discover.ptx

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[David Austin]

Thanks, Mark.  I sent you a PR that reorganizes your project a bit.  As a rule, we don't want to include assets in the repository that can be generated from source so I removed your directories "generated" and ".cache" and updated your publication file directing PreTeXt to store generated assets in a "generated-assets" directory.  Also, generated assets should not go inside "source" so that is now a sibling of "source" (PreTeXt will create that directory when you build again).  This builds cleanly for me and includes the proper version of that diagram.  

When I forked your repository, I noticed that the assets were not being generated as they should have been so I suspect something similar was happening with you and that diagram was not being updated as you would have expected.  Just let me know if you have questions.

David

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[Mark Fitch]

The code is at: https://github.com/mafitch/calculus1.git

On 8/26/2026 4:40 PM, David Austin wrote:

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[David Austin]

Did you see the PR I sent?

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[Mark Fitch]

The PR is noted. 

I finally found an error reported for this Prefigure. It is below. Does this suggest my copy of Prefigure is missing some definitions?

error: Unknown function in evaluation: abs
error: Unsafe function definition: sqrt(abs(x-4))
error: Error in definition: Unsafe function definition: sqrt(abs(x-4))
error: Error retrieving function in graph: Unrecognized name: f
error: Error retrieving function in graph: Unrecognized name: f

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[David Austin]

Yes, that suggests you have a pretty old version of prefig.  I'm not sure how you're working but "pip install --upgrade prefig" in a terminal window will probably do the trick.

To view this discussion visit https://groups.google.com/d/msgid/pretext-support/6fcad97b-65e2-42a6-bba5-de54657bb7ea%40alaska.edu.

[Mark Fitch]

After uninstall pretext and reinstalling both, everything works now.

To view this discussion visit https://groups.google.com/d/msgid/pretext-support/CANXmVMAbvCnYKQmmaK%3DgB%2BOB107Jiy1czZsMVBM9BhZqY1yZ0g%40mail.gmail.com.

[David Austin]

Glad to hear it!

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