## WeBWorK Problems

### Errors on problem in Gateway Quiz mode but not in Homework mode

by Paul Seeburger -
Number of replies: 1
Can anyone give me insight into what I need to change to allow the following problem to work without errors in a Gateway Quiz?  It seems to work fine without errors in Homework mode, marking the problem correct (when the correct answers are entered) and stating the correct answers.

But in Gateway Quiz mode it does not mark the answers as correct or display the correct answers.  It also gives the following errors.  See the actual problem code below this image.

My guess is that it has something to do with the NAMED_ANS_CHECKBOX I used in the problem.  I need a multiselect problem with graphs, and it seemed to work well to accomplish this in Homework mode.  Is there another way I could accomplish this that would work in Gateway Quiz mode?

Thanks!

Paul

# Gateway Quiz Undefined_Set,v1

Your score on this (checked, not recorded) submission is 0/1.
The recorded score for this test is 0/1.

## Problem 1.

In the diagrams below, the red vector represents a gradient vector of the function  and the blue vector represents a gradient vector of the constraint function  (treated as a function of  and ).

Which of the diagrams shows a point at which a relative extreme value of  might be found, subject to the given constraint? (Select as many as apply.)

 A B C D E F

Note: You can earn partial credit on this problem.

0% correct
0% correct

## WeBWorK Warnings

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### Warning messages

• Use of uninitialized value $answerScore in numeric gt (>) at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line 407. • Use of uninitialized value$studentAnswer in pattern match (m//) at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line 409.
• Use of uninitialized value $answerScore in numeric ge (>=) at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line 409. • Use of uninitialized value$answerScore in numeric ge (>=) at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line 412.
• Use of uninitialized value $answerScore in multiplication (*) at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line 422. • Use of uninitialized value$answerScore in numeric gt (>) at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line 407.
• Use of uninitialized value $studentAnswer in pattern match (m//) at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line 409. • Use of uninitialized value$answerScore in numeric ge (>=) at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line 409.
• Use of uninitialized value $answerScore in numeric ge (>=) at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line 412. • Use of uninitialized value$answerScore in multiplication (*) at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line 422.

### Request information

 Time Fri Oct 28 08:28:44 2016 Method POST URI /webwork2/Monroe_CC_MTH_212-Seeburger/quiz_mode/Undefined_Set,v1/

My Problem Code:
## DBsubject(Calculus - multivariable)
## DBchapter(Vector calculus)
## DBsection(Optimization)
## Date(10/25/2016)
## Author(Paul Seeburger)
## Institution(Monroe Community College)
##KEYWORDS('')
## TitleText1('')
## EditionText1('')
## AuthorText1('')
## Section1('')
## Problem1('')

DOCUMENT();

"PGstandard.pl",
"PGchoicemacros.pl",
"PGunion.pl",
##"PGcourse.pl",
);

TEXT(beginproblem());

##  Colors
$bRed = MODES(TeX => '{\\color{red} ', HTML => '<span style="color:red">');$eRed = MODES( TeX => '}', HTML => '</span>');
$bBlue = MODES(TeX => '{\\color{red} ', HTML => '<span style="color:blue">');$eBlue = MODES( TeX => '}', HTML => '</span>');

############
#    SETUP    #
############
##$mc = new_checkbox_multiple_choice();$diagrama = Image('imageP1-2a.gif',size=>[200,200],tex_size=>200,tex_center=>1);
$diagramb = Image('imageP1-2b.gif',size=>[200,200],tex_size=>200,tex_center=>1);$diagramc = Image('imageP1-2c.gif',size=>[200,200],tex_size=>200,tex_center=>1);
$diagramd = Image('imageP1-2d.gif',size=>[200,200],tex_size=>200,tex_center=>1);$diagrame = Image('imageP1-2e.gif',size=>[200,200],tex_size=>200,tex_center=>1);
$diagramf = Image('imageP1-2f.gif',size=>[200,200],tex_size=>200,tex_center=>1); ##$ans = '';
$ra = NAMED_ANS_CHECKBOX('checks','A','A');$rb = NAMED_ANS_CHECKBOX_OPTION('checks','B','B');
$rc = NAMED_ANS_CHECKBOX_OPTION('checks','C','C');$rd = NAMED_ANS_CHECKBOX_OPTION('checks','D','D');
$re = NAMED_ANS_CHECKBOX_OPTION('checks','E','E');$rf = NAMED_ANS_CHECKBOX_OPTION('checks','F','F');
$ans = 'AEF'; ################ # MAIN BODY # ################ #Prints Questions and Answers# BEGIN_TEXT In the diagrams below, the$BBOLD$bRed red vector$eRed$EBOLD represents a$BBOLD gradient vector$EBOLD of the function $$f$$ and the$BBOLD$bBlue blue vector$eBlue$EBOLD represents a$BBOLD gradient vector$EBOLD of the$BBOLD$bBlue constraint function$eBlue$EBOLD $$g$$ (treated as a function of $$x$$ and $$y$$).$PAR
Which of the diagrams shows a point at which a relative extreme value of $$f$$ might be found, subject to the given constraint? (Select as many as apply.)
$PAR \{ BeginTable(spacing=>5). AlignedRow([$diagrama, $diagramb,$diagramc]).
AlignedRow([$ra,$rb, $rc]). TableSpace(16,8). AlignedRow([$diagramd, $diagrame,$diagramf]).
AlignedRow([$rd,$re, $rf]). EndTable() \} END_TEXT ## install_problem_grader(~~&std_problem_grader); NAMED_ANS(checks => checkbox_cmp($ans));

ENDDOCUMENT();