## WeBWorK Problems

### MathObjects: TeXing Functions ### MathObjects: TeXing Functions

by Robin Cruz -
Number of replies: 2

I tried to get a function to show up in it's TeX form as follows:

$a = random(1,9,1);$b = non_zero_random(-9,9,1);
$f = Formula("$a + $b x");$x = random(1,9,1);
BEGIN_TEXT
Evaluate the algebraic expression for the given value(s):

$${f->TeX}$$, for $$x = x$$
$BR Answer: \{ ans_rule(20) \} END_TEXT This is what shows up: (2+(-5)*x) If I change the context to texStrings before BEGIN_TEXT, then back to normalStrings after END_TEXT and remove the "->TeX", then the formula shows up nicely. I thought we could do this without changing the context? Thanks--rac In reply to Robin Cruz ### Re: MathObjects: TeXing Functions by Davide Cervone - You can do it without setting the context, but you need to use \{ ... \} not just {...} inside the math mode. This causes the$f->TeX to be performed as a command and the result of it to be put in math mode. The way you currently have it, $f is replaced by its string version, so it is the same as $${ (2+(-5)*x)->TeX }$$; the braces are part of the math formula, and so is the ->TeX! You may also want to use$f = Formula("$a +$b x")->reduce; in order to avoid the "plus a negative" and coefficients of 1, and so on.

Davide 