## WeBWorK Problems

### Re: Compile errors that seem to be because of the use of y as a variable

by Murphy Waggoner -
Number of replies: 0
Thanks, Davide.  I seem to be struggling to write even the simplest question lately.  It is probably because I am trying to use the Matrix context and am not quite familiar with it.  I tried the following for the problem above and it wouldn't work.  At that time I didn't think of putting the " " around just the individual variable expressions.

$A = Matrix("[ [ a,$a],
[ y, $b], ]"); I had one today where the expressions were more complex than above. My final (working) version looked something like this. So, I think I've learned my lesson. Finger's crossed. $A = Matrix("[
[ Formula("$a a^2 - 2"),$a],
[ Formula("$b a b + b^2"),$b],
]");