MatrixAnswer2
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Matrix Answer 2
This PG code shows how to collect matrix answers using one textbox for the entire matrix a student enters.
 File location in OPL: FortLewis/Authoring/Templates/LinAlg/MatrixAnswer2.pg
 PGML location in OPL: FortLewis/Authoring/Templates/LinAlg/MatrixAnswer2_PGML.pg
PG problem file  Explanation 

Problem tagging: 

DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", "PGcourse.pl", ); TEXT(beginproblem()); 
Initialization: 
Context('Matrix'); $example1 = Matrix([[1,2,3],[4,5,6]]); $example2 = $example1>column(1); $example3 = $example1>row(1); 
Setup 1: We construct a 2 by 3 matrix and extract its first column and first row. 
Context()>texStrings; BEGIN_TEXT The purpose of this question is to show you the syntax needed to enter matrices in WeBWorK when there is only one answer box for entering a matrix (which is not obvious) or when there are multiple answer boxes for entering a matrix (which is obvious). The examples below should be selfexplanatory, so you can jump to them if you want; however, a detailed explanation follows if you want to read more. $BR $BR Matrices use square brackets to enclose items in lists. A matrix with one row, such as a row vector, is a comma separated list enclosed by square brackets. A matrix with more than one row or a column vector is a comma separated list of lists, where each list uses square brackets to enclose its items. Your answers must use square brackets to enclose each row in a matrix or in a column vector. Also, a pair of square brackets is needed to enclose a matrix with more than one row (e.g., a \( 2 \times 3 \) matrix and a \( 2 \times 1 \) column vector have multiple rows so they need extra square brackets, but a \( 1 \times 3 \) row vector has only one row so it does not need extra square brackets). Your answers may have spaces and line breaks in them, such as $PAR $BCENTER [ [1, 2, 3], $BR [4, 5, 6] ] $ECENTER $BR $BR Enter the matrix \( $example1 \) as \{ $example1>string \} $BR \{ ans_box(3,30) \} $BR $BR Enter the column vector \( $example2 \) as \{ $example2>string \} $BR \{ ans_box(3,30) \} $BR $BR Enter the row vector \( $example3 \) as \{ $example3>string \} $BR \{ ans_box(3,30) \} END_TEXT Context()>normalStrings; 
Main Text 1:
Use 
$showPartialCorrectAnswers = 1; ANS( $example1>cmp() ); ANS( $example2>cmp() ); ANS( $example3>cmp() ); 
Answer Evaluation 1: 
Context('Matrix'); $example1 = Matrix([[1,2,3],[4,5,6]]); 
Setup 2:
Reset the context by calling 
Context()>texStrings; BEGIN_TEXT $BR $BR Entering a matrix using multiple answer blanks is straightforward  just put each matrix entry into its own answer blank. $BR Enter the matrix \( $example1 \) with one matrix entry per answer box. $BR \{ $example1>ans_array \} END_TEXT Context()>normalStrings; 
Main Text 2: 
ANS( $example1>cmp() ); COMMENT('MathObject version.'); ENDDOCUMENT(); 
Answer Evaluation 2: 