** Using WeBWorK **

I've successfully installed WebWork2, and a problem library. An issue we've run into is that certain macros don't work right. Does anyone have a solution? (below is the output from one of the broken pages)

	Error messages

 

	
		Undefined subroutine &main::init_graph called at (eval 128) line 45.

 

	Error context

 

        Problem1

ERROR caught by Translator while processing problem file:Library/maCalcDB/setAlgebra16FunctionGraphs/jj1.pg

*

Undefined subroutine &main::init_graph called at (eval 128) line 45.

*

------Input Read

1		##DESCRIPTION

2		##   Evaluation of a simple algebraic expression

3		##ENDDESCRIPTION

4		

5		##KEYWORDS('percent')

6		## tcao tagged and PAID on 2-20-2004

7		

8		## DBchapter('Functions')

9		## DBsection('Average Rate of Change: Increasing and Decreasing Functions')

10		## Date('6/3/2002')

11		## Author('Tangan Gao')

12		## Institution('csulb')

13		## TitleText1('College Algebra')

14		## EditionText1('3')

15		## AuthorText1('Stewart, Redlin, Watson')

16		## Section1('4.4')

17		## Problem1('24')

18		

19		#

20		# First comes some stuff that appears at the beginning of every problem

21		#

22		

23		DOCUMENT();        # This should be the first executable line in the problem.

24		

25		loadMacros(

26		PG.pl,

27		PGbasicmacros.pl,

28		PGchoicemacros.pl,

29		PGanswermacros.pl,

30		PGauxiliaryFunctions.pl,

31		PGgraphmacros.pl,

32		extraAnswerEvaluators.pl

33		);

34		

35		TEXT(&beginproblem);

36		

37		$a = random(-7,-1);

38		$b = random(1,7);

39		$c = random(1, 3.5, 0.01);

40		$up = random(-2,2,0.01);

41		

42		($x1dom, $y1dom, $x2dom, $y2dom) = (10,10, 10, 10);

43		($xgrid, $ygrid) = ($x1dom+$x2dom,$y1dom+$y2dom);

44		

45		$graph = init_graph(-$x1dom,-$y1dom,$x2dom,$y2dom,

46		   'axes'=>[0,0],

47		   'grid'=>[$xgrid,$ygrid],

48		   'size'=>[400,400]);

49		

50		$f = FEQ("$c*(((2*(x-$a)/($b-$a)-1))**3 - 3*((2*(x-$a)/($b-$a)-1))) for x in <-$x1dom,$x2dom> using color:blue and weight:2");

51		($fref) = plot_functions( $graph, $f);

52		

53		

54		# Label some points

55		#$label1 = new Label(0,$a, "$a",'black','right');

56		#$label2 = new Label($period, 0, "($period,0)",'black','left');

57		#$d = -$a;

58		#$label3 = new Label(0,$d,"$d",'black','right');

59		#$graph->lb($label1, $label2, $label3);

60		

61		

62		

63		

64		BEGIN_TEXT

65		Consider the function shown in the following graph.

66		$BR

67		{ image(insertGraph($graph), width=>203, height=>178) } $BR

68		Where is the function decreasing?

69		$BR

70		{ans_rule(40)}

71		$BR $BBOLD Note: $EBOLD use interval notation to enter your answer.

72		END_TEXT

73		

74		ANS(interval_cmp("($a,$b)", sloppy=>'yes'));

75		

76		ENDDOCUMENT();        # This should be the last executable line in the problem.

<| Post or View Comments |>

• Do you only have trouble on problems with on-the-fly-graphs?  Other graphs?  Ones with no graphs?
• Have you gotten a fresh copy of the pg tree, and set pg root accordingly?
• Have you updated global.conf.dist, and then updated global.conf to match?  There were lots of changes in the past week.

<| Post or View Comments |>

• No Graphs are displayed. Other functions such as NchooseK and inverse trig functions dont work as well (atan comes to mind)
• I'm using the PG that came with previewRelease4, I'm unsure as to where the PG root needs to be set, global.conf says that $pgRoot is made available to it, implying that $pgRoot is set elsewhere. However, grep'ing the webwork folder doesn't show that assignment taking place elsewhere.
• We havn't updated our installation via CVS since we had to go through and remove be_strict from many files because of an error that's been talked about elsewhere. I will look at the new global.conf.dist and see what's up though

<| Post or View Comments |>

PGroot is set (along with webwork root) in the httpd.conf file (the apache config file)

These two directories are passed to the apache server so that mod_perl knows where to find everything else.

It's a good bet that your copy is not correctly loading the files PGchoicemacros.pl and PGgraphmacros.pl and that that is causing the errors. I would have expected that there would be warnings in the log file that indicated that those files could not be read. If not, you can report that as a bug. There should be some warning if the file is not loaded properly.

The be_stict problem was fixed this last weekend (at least it now works on perl 5.8.3) It involved a modification in the definition of PG_restricted_eval().

While it might be a bit of trouble initially I'd recommend updating the pg library to the latest version (unless you made substantial modifications besides the be_strict one) and probably the webwork-modperl library unless you made a great many modifications in that. Save your current versions just in case -- we don't have much experience with apache2 and I wouldn't want you to loose the changes you've made to get WeBWorK to work with apache2.

There were a lot of patches and bugs corrected over this last weekend.

-- Mike

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Looking in the CVS, that file was removed on sunday. Should I manually download it?

Andrew

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The functionality in that file has been moved elsewhere, at least for now.

Take care,

Mike

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