I am working on a self-checking table and I’m able to get the table to check correctly for the first two expressions by using the following code:
a1=table9.cellContent(1,2)
However, it’s not correctly checking the last expression in the table:
a3=table9.cellContent(3,1)
check3=simpleFunction(a3,“x”).evaluateAt(2)=0 and countNumberUsage(a3,-2)=1
cellContent(3,3):
I think there is a problem with the countNumberUsage and the negative number. Any suggestions? Here’s a link to the example I’m working on… Table Self Check Example • Activity Builder by Desmos
Yes, countNumberUsage doesn’t take negatives, just make it 2.
JayChow
May 5, 2020, 3:51pm
3
Careful, just checking those two things makes it really easy to break:
source:
by Jay Chow
That’s originally why I was trying to search for the negative 2. However, I think if I just search for the 3, in (x-2)(x-3) it will have the same effect and avoid the issue of counting the squared . I also added in another value check to avoid accepting (x-2)(x+3). Do you think that’s strong enough to check corectly?
I updated my original link.
Thank you for your help!!!
JayChow
May 5, 2020, 5:58pm
6
I had to try a little harder but I could break it:
If you want to be completely certain, check three points each to make sure its a curve and count both the number total and the individual totals for each number in the expression.
Totally your call
vp806
May 8, 2020, 3:49am
7
How does the countnumberusage work. can you explain that?
countNumberUsage can count how many numbers are used in a latex string. Say a student enters 3x^2+14x-2.
countNumberUsage(inputName.latex) would output 4, counting the 3, 2 2’s, and 14. Note: It counts numbers, not digits.
It can also count a specific number.
countNumberUsage(inputName.latex, 14) would output 1. You cannot enter negative numbers for the second parameter.
” otherwise “
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