Search for pattern matching in this forum. There’s one from @JayChow that has links to youTube tutorials.
Thanks so much for this! I am working on a new version of “What’s My Transformation” using this. The horizontal stretching is the issue. If anyone has thought of a solution, please let me know. Thanks- this is really cool.
Slide 9 number 3 is not working:
This is how I handled it thanks to Mike Gleeson.
Thank you, I did find this post! Here is the “What’s my transformation” activity I did thanks to Mike Gleeson and thanks to your material as well- thank you.
@Daniel_Grubbs is there a “Part 1” activity that you can link up for this? I want to share both with a colleague who was just talking about students struggling with transformations. Thanks!
I found this thread while trying to work out CL to check student entry on this slide (part of a larger activity about FTC):
After studying the examples here, I got it to work! 
It feels a little bit “hacky”, but it does mark correctly for the correct answer, and it marks incorrect for most of the “obvious” wrong answers that I could think of.
However, it would also mark “correct” if a student entered, say, 7gx+2, 7xg+2, or other wonky answers. I don’t think a student would do this, but who knows?? (They have surprised me before!)
I tried adding a bit of latex-checking to look for these, but I’m sure that won’t be foolproof and wonder if there is another way. If there was a way to search the student’s input and confirm that “g(x)” is included, that seems like it would tighten up this correctness check. If not, I’ll live with it as is, but in my heart I know it’s breakable and this might keep me awake at night! 
I’ll check into later, but in the meantime, you may want to look at evaluationFrame( ).
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I thought maybe evaluationFrame could output a transformed, but you can probably find use of patterns.functionCall. Here’s a little fiddling (Screen 3) I did that I think will address your below issue.
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Added Screen 4 for a few things you might consider for your slide in question.
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Thank you so much! This is fabulous! I made a few tweaks to your tweaks and it does just what I wanted it to. It is screen 11 in this activity.
Is there any documentation or help for patterns.functionCall? I studied your code but would like to better understand how it works and what other use cases there are for it.
Thanks for your help!
“patterns” is just not well documented. functionCall in particular is newer. Here’s what I notice…
p.functionCall.parse(this.latex).term1.identifier outputs function name latex.
p.functionCall.parse(this.latex).term1.n outputs the number of parameters.
p.functionCall.parse(this.latex).term1.nth(2) outputs the latex of a parameter (the second in this example).
There’s also this thread talking about how it doesn’t play well with p.product.
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If you can create a pattern that matches your intended answer, you can use the hack posted in the other thread. For example, for 7g(x)+2 → 7d_{ummy}+2, the basic and explicit patterns would be
p.sum(p.product(p.integer, p.literal(`d_{ummy}`) ), p.integer )
p.sum(p.product(p.integer.satifies(`x=7`), p.literal(`d_{ummy}`) ), p.integer.satifies(`x=2`) )
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Thank you again! This is so helpful. I still haven’t fully grasped/embraced patterns but I am going to try to get more comfortable with them. That’s going on my summer to-do list! 