I'm trying to have students enter two ordered pairs, separated by commas. I want their answers to be rounded to two decimal places, and I tried the following:

Context("Point");

$xi1 = Point(2+sqrt(5),0);

$xi2 = Point(2-sqrt(5),0);

$x_intercepts = List($xi1,$xi2);

...

\{ans_rule(20)\}

...

ANS($x_intercepts->with(tolType=>'absolute',tolerance=>.005)->cmp);

The answer input of "(4.24,0), (-.24,0)" gets only half credit--the second point (-.24,0) is not correct, but the correct value is approximately (-.236068,0).

I expected (-.24,0) to be marked correct, because the error is less than 0.005. What am I missing?

ANS($x_intercepts->cmp(tolType=>'absolute',tolerance=>.005));I like your version better from a conceptual viewpoint, but this one has the advantage of actually working with the existing code. The problem needs to be fixed, but this will work now.

Hope that helps.

Davide

Davide,

That does it, thanks!

Bruce

That does it, thanks!

Bruce