## WeBWorK Main Forum

### Re: MathObject formatting PG 2.6/2.7

by Gavin LaRose -
Number of replies: 0
Hi all,

As a follow-up, I've isolated the problem to the rendering of the ijk format of the vector. A stripped down version of the problem that I'm using is appended. In this, both ijk formatted vectors display as in the lower figure above (as an experiment, I also moved the definition of $vijk above the Context()->texStrings call, to no effect); the standard formatted vector is as expected; and the components of the vector all display correctly. Thoughts welcome. Thanks, Gavin DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", ); TEXT(beginproblem());$showPartialCorrectAnswers = 1;

$c1 = non_zero_random(-5,5,1);$c2 = non_zero_random(3,7,1); $c3 = non_zero_random(-3,3,1);$c1c2 = $c1*$c2;  $twoc1 = 2*$c1; $c2m1 =$c2 - 1;  $nc1c2 = -1*$c1c2;
@vel = ( Compute("($twoc1)*t+$c2"), Compute("-$c1*e^(-t)"), Compute("-($c1c2)*sin($c2*t)") );$vel = Vector( @vel );
$acc =$vel->D;
$vijk =$vel->ijk;
The velocity of a particle is given by $${\bf v}(t) = \{ vel->ijk \}$$. Find
the acceleration $${\bf a}(t)$$: \{ ans_rule(45) \}
$PAR $$v_1 = vel[0]$$$BR $$v_2 = vel[1]$$$BR $$v_3 = vel[2]$$$BR $$v = vel$$$BR $$v = vijk$$ END_TEXT ANS($acc->cmp() );