I was trying to clean up previously written problems and added parserCustomization.pl to the macos (allowing both i and j as sqrt(-1) ). This appeared to work well for the problems that I was testing. However, some problems in a different HW group in the same class, failed - as noted by a student. I was not working on the problems that he was working on - indeed, the problems that he was concerned with had no complex numbers. I cannot see why it failed. I had 7 problems that all used the same load macros command - all total overkill on macros (I know I don't need all of these, but I thought I'd include them all since some may be caused the problem, since the problem was modified from one in the problem library, before I understood mor about which macros are actually needed. However, only 2 of the problems bomb. I don't understand why. When I remove the parserCustomization.pl macro, the problem compile and execute correctly.
Currently, we are running without
parserCustomization.pl in the macros folder - and living with the i in the complex equations.
Error and code below
Joel
*********************
Error messages
ERRORS from evaluating PG file:
Error detected while loading [PG]/macros/MathObjects.pl: PG_macro_file_eval
detected error at line 123 of file [PG]/lib/PGloadfiles.pm Error detected
while loading [PG]/macros/Parser.pl: PG_macro_file_eval detected error at
line 123 of file [PG]/lib/PGloadfiles.pm Error detected while loading
[TMPL]/macros/parserCustomization.pl: PG_macro_file_eval detected error at
line 123 of file [PG]/lib/PGloadfiles.pm Can't locate object method
"Default" via package "context::ComplexJ" (perhaps you forgot to load
"context::ComplexJ"?) at line 6 of [TMPL]/macros/parserCustomization.pl,
chunk 1. The calling package is PGloadfiles The calling package is
PGloadfiles The calling package is PGloadfiles Died within
PGloadfiles::compile_file called at line 166 of [PG]/lib/PGloadfiles.pm
from within PGloadfiles::loadMacros called at line 444 of [PG]/macros/PG.pl
from within main::loadMacros called at line 18 of (eval 2269)
Error details
You do not have permission to view the details of this error.
Figured it would be of best interest to notify ASAP.
Thanks ahead of time,
-Matt
***** Data about the problem processor: *****
Display Mode: MathJax
Show Old Answers: yes
Show Correct Answers: no
Show Hints: yes
Show Solutions: no
***** Data about the user: *****
User ID: mpfishe2@ncsu.edu
Name: Matt Fisher
Email: mpfishe2@ncsu.edu
Student ID: 200046154
Status: Enrolled ('C')
Section:
Recitation:
Comment:
***** Data about the problem: *****
Problem ID: 3
Source file: local/setHomework_7_templates/Eulers_method_2nd_order_system_03.pg
Value: 10
Max attempts 10
Random seed: 4120
Status: 0
Attempted: no
Last answer: none
Number of correct attempts: 0
Number of incorrect attempts: 0
***** Data about the homework set: *****
Set ID: Homework_8
Set header file: defaultHeader
Hardcopy header file: defaultHeader
Open date: 10/30/2014 at 08:55am EDT
Due date: 11/14/2014 at 12:45pm EST
Answer date: 11/14/2014 at 12:45pm EST
Visible: yes
Assignment type: default
**********************************************************************************
# DESCRIPTION
# Problem from 'Mathematics: The Language of Electrical and Computer Engineering', Viniotis and Trussell, 3rd ed.
# WeBWorK problem written by Joel Trussell, <hjt@ncsu.edu>
# ENDDESCRIPTION
## DBsubject(Electrical Engineering)
## DBchapter(Differential equations)
## DBsection(Problems)
## Institution(North Carolina State University)
## Author(H. J. Trussell)
## TitleText1('Mathematics: The Language of Electrical and Computer Engineering')
## AuthorText1('Viniotis and Trussell')
## EditionText1('3')
## Problem1('7.23-24')
DOCUMENT(); # This should be the first executable line in the problem.
loadMacros(
"PG.pl",
"PGbasicmacros.pl",
"PGchoicemacros.pl",
"PGanswermacros.pl",
"PGgraphmacros.pl",
"PGmatrixmacros.pl",
"PGnumericalmacros.pl",
"PGauxiliaryFunctions.pl",
"PGcourse.pl",
"PGstandard.pl",
"MathObjects.pl",
"AnswerFormatHelp.pl",
"unionTables.pl",
"parserAssignment.pl",
"parserImplicitEquation.pl",
"unionLists.pl",
"parserPopUp.pl",
#"PGmorematrixmacros.pl"
);
TEXT(beginproblem());
$showPartialCorrectAnswers = 1;
Context("ImplicitEquation");
Context()->variables->{namePattern} = qr/[a-z][a-z0-9_]*'*/i;
Context()->variables->add(t=>"Real","v"=>"Real","v'"=>"Real",v1=>"Real",v2=>"Real",w=>"Real");
Context()->flags->set(
tolerance => 0.001,
tolType => "absolute",
zeroLevel => 1E-12, # when to use zeroLevelTol
zeroLevelTol => 1E-10, # smaller than this matches zero
ImplicitTolerance => 1E-6,
);
$c1 = random(2,9,1);
$c2 = random(2,9,1);
$c3 = random(2,9,1);
$c4 = random(2,9,1);
$w = random(10,100,10);
$a[1] = random(2,6,1) * random(-1,1,2);
$a[2] = $a[1];
$a[3] = random(2,6,1) * random(-1,1,2);
$a[4] = $a[3];
$tag = random(1,4,1);
$a[$tag] = - $a[$tag];
$m = random(2,5,1);
$n = random(2,5,1);
if ($m == $n) {$n = $n+1;}
$p = random(2,9,1);
$vd = Formula(" $c3 t cos(t) ");
$yd = Formula(" $c4 sin($w t)^2 ");
$h = 0.1;
$h2 = 2*$h;
$h3 = 3*$h;
$v0 = random(2,5,1);
$vdot0 = random(0,3,1);
$y0 = random(2,5,1);
$ydot0 = random(0,3,1);
$vdh = $c3*$h*cos($h);
$vdh2 = $c3*$h2*cos($h2);
$vdh3 = $c3*$h3*cos($h3);
$ydh = $c4*sin($w*$h)**2;
$ydh2 = $c4*sin($w*$h2)**2;
$ydh3 = $c4*sin($w*$h3)**2;
$vh = $v0 + $h*(-$c1)*$y0 ;
# if (abs($vh)<10**(-10)) {$vh = 0};
$yh = $y0 + $h*(-$c2)*$v0 ;
$vh2 = $vh + $h*(-$c1)*$yh + $h*$vdh;
$yh2 = $yh + $h*(-$c2)*$vh + $h*$ydh;
$vh3 = $vh2 + $h*(-$c1)*$yh2 + $h*$vdh2;
$yh3 = $yh2 + $h*(-$c2)*$vh2 + $h*$ydh2;
# det = $a[1] * $a[4] * e^(($m+$n)*t);
BEGIN_TEXT
This problem is related to Problem 7.23-24 in the text.
$PAR
Given the system of differential equations
$PAR
\( v' + $c1 y = $vd u(t)\)
$PAR
\( y' + $c2 v = $yd u(t) \)
$PAR
$BR The matrix equation for using Euler's method to compute \( v(t+h) \) and \( y(t+h) \), takes the same form as in the answer to Problem 9.
$PAR
For \( h = $h \), compute the solution for \( t = 0, $h, $h2, $h3 \), when the initial conditions are \( v(0) = $v0 \), and \( y(0) = $y0 \).
$BR
\( v(0) = \) \{ ans_rule(15)\} $BR
\( v(0.1) = \) \{ ans_rule(15)\} $BR
\( v(0.2) = \) \{ ans_rule(15)\} $BR
\( v(0.3) = \) \{ ans_rule(15)\} $BR
\( y(0) = \) \{ ans_rule(15)\} $BR
\( y(0.1) = \) \{ ans_rule(15)\} $BR
\( y(0.2) = \) \{ ans_rule(15)\} $BR
\( y(0.3) = \) \{ ans_rule(15)\} $BR
END_TEXT
ANS( Compute($v0)->cmp() );
ANS( Real($vh)->cmp() ); # change this later
ANS( Compute($vh2)->cmp() );
ANS( Compute($vh3)->cmp() );
ANS( Compute($y0)->cmp() );
ANS( Real($yh)->cmp() );
ANS( Compute($yh2)->cmp() );
ANS( Compute($yh3)->cmp() );
ENDDOCUMENT(); # This should be the last executable line in the problem.
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problem with parserCustomization.pl
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