When I acted as a student and tried to view a particular exercise, I saw the message that WeBWorK did not recognize "random_list".
However, when I stop acting as the student, the error message goes away.
I tried acting as two other students and got the same error message.
The exercise is one of Robin Cruz's CollegeOfIdaho exercises:
setAlgebra_06_02_AddSubRationalExpressions/62IntAlg_20_AddSubRatExp.pg
Bruce Yoshiwara
WeBWorK Error
WeBWorK has encountered a software error while attempting to process this problem. It is likely that there is an error in the problem itself. If you are a student, report this error message to your professor to have it corrected. If you are a professor, please consult the error output below for more information.
Error messages
Undefined subroutine &main::random_list called at line 40 of [TMPL]/Library/CollegeOfIdaho/setAlgebra_06_02_AddSubRationalExpressions/62IntAlg_20_AddSubRatExp.pg
Error details
Problem21
ERROR caught by Translator while processing problem file:Library/CollegeOfIdaho/setAlgebra_06_02_AddSubRationalExpressions/62IntAlg_20_AddSubRatExp.pg
****************
Undefined subroutine &main::random_list called at line 40 of [TMPL]/Library/CollegeOfIdaho/setAlgebra_06_02_AddSubRationalExpressions/62IntAlg_20_AddSubRatExp.pg
****************
------Input Read
1 ##DESCRIPTION
2 ## Rational Expressions and Functions: Add and Subtract
3 ##
4 ##ENDDESCRIPTION
5 ## DBsubject('Intermediate Algebra')
6 ## DBchapter('Ch 06: Rational Expressions, Functions and Equations')
7 ## DBsection('Rational Expressions and Functions: Adding and Subtracting')
8 ## KEYWORDS('rational expressions','rational functions')
9 ## TitleText1('Essentials of Intermediate Algebra')
10 ## EditionText1('1')
11 ## AuthorText1('Blitzer')
12 ## Section1('6.2')
13 ## Problem1('')
14 ## Author('RA Cruz')
15 ## Institution('The College of Idaho')
16 ## Date: 2007/11
17
18 DOCUMENT(); # This should be the first executable line in the problem.
19
20 loadMacros(
21
22 "PGstandard.pl",
23
24 "MathObjects.pl",
25
26 "CofIdaho_macros.pl"
27
28 );
29
30 TEXT(beginproblem());
31
32 ######################################
33 # Setup
34 # Form: (x+a)/(x+b) + (x+c)/(x+d)
35 # Note: b neq d, and result numerator is prime
36 # Answer: (2x^2+(a+b+c+d)x+(ad+cb))/(x+b)(x+d)
37
38 $b= non_zero_random(-4,4,1);
39 $d= non_zero_random(-4,4,1);
40 if ($b==$d) {$d = random_list(-7,-5,5,7);}
41 do { #Keep the numerator prime
42 $a= non_zero_random(-3,3,1);
43 $c = random(2,5,1);
44 } until (($a+$b+$c+$d)**2-8*($a*$d+$c*$b)<0);
45
46 $f1 = Formula("(x + $a) / (x + $b)")->reduce->TeX;
47 $f2 = Formula("(x + $c) / (x + $d)")->reduce->TeX;
48
49 ######################################
50 # Main text
51
52 BEGIN_TEXT
53 Perform the indicated operation. Note that the denominators
54 are different. Simplify the result, if possible.
55 \[ $f1 + $f2 \]
56 $PAR
57 Answer: \{ ans_rule(25) \}
58 END_TEXT
59
60 ######################################
61 # Answer
62
63 $answer = "(2*x**2+($a+$b+$c+$d)*x+($a*$d+$c*$b))/((x+$b)*(x+$d))";
64 ANS(RationalExpEvaluator($answer,"x"));
65
66 $showPartialCorrectAnswers = 1;
67
68 ######################################
69
70
71 COMMENT('MathObject version');
72 ENDDOCUMENT();
-----
Request information
Time Mon Nov 22 10:39:42 2010
Method GET
URI /webwork2/pierce_math125/Lesson37SkillsWarmUp/21/
HTTP Headers
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Edit this problem
Hi Bruce,
The fix should be this simple: change random_list() to list_random(). Let us know if this doesn't fix it. I've updated the NationalProblemLibrary on subversion trunk with this change.
It is also possible to submit bug reports for things like this. While logged in as instructor (possibly acting as a student), open the set and the problem. Near the "Submit Answers" button you will see a link "Edit this problem". Click that link and you'll get a text box with the problem source code in it. Near the top right corner of that text box is a link "report problem bugs". This will take you to the "bugzilla" bug reporting software, which requires that you create an account and log in. After you log in to bugzilla, you'll be presented with a fairly straightforward form to fill out. Giving a very complete description of how the bug arises helps greatly. The main benefit of bugzilla is that it provides the bugfixers with more detailed technical information (where is the problem source code found? etc.) about how the bug arose, and removes from you some of the burden of trying to report technical info on the bug.
Thanks for reporting the bug, and please keep reporting them as they arise, whether in this forum or via bugzilla.
Best Regards,
Paul Pearson
The fix should be this simple: change random_list() to list_random(). Let us know if this doesn't fix it. I've updated the NationalProblemLibrary on subversion trunk with this change.
It is also possible to submit bug reports for things like this. While logged in as instructor (possibly acting as a student), open the set and the problem. Near the "Submit Answers" button you will see a link "Edit this problem". Click that link and you'll get a text box with the problem source code in it. Near the top right corner of that text box is a link "report problem bugs". This will take you to the "bugzilla" bug reporting software, which requires that you create an account and log in. After you log in to bugzilla, you'll be presented with a fairly straightforward form to fill out. Giving a very complete description of how the bug arises helps greatly. The main benefit of bugzilla is that it provides the bugfixers with more detailed technical information (where is the problem source code found? etc.) about how the bug arose, and removes from you some of the burden of trying to report technical info on the bug.
Thanks for reporting the bug, and please keep reporting them as they arise, whether in this forum or via bugzilla.
Best Regards,
Paul Pearson
Hi Paul,
Thanks, that did it!
Bruce
Thanks, that did it!
Bruce