[system] Repository: Repository Listing bbplugincoursesdistsnplrochestersystemwww # Revision 3269

Jump to revision:  dpvc Sun Jun 5 23:52:11 2005 UTC (14 years, 8 months ago) ```Added ability to have Matrix, Vector and Point objects produce input arrays similar to the ones available in PGmatrixmacros.pg. This provides some substantial new functionality, and it may still have some shaking down to do, but it should not affect the existing functionality of the answer checkers. To create an answer array for a matrix, vector or point, use the new ans_array() or named_ans_array() methods of these objects. For example: Context("Matrix"); \$M = Matrix([1,2],[3,4]); BEGIN_TEXT \{\$M->TeX\} = \{\$M->ans_array\} END_TEXT ANS(\$M->cmp); This creates a matrix, then prints it ans creates an answer array of the appropriate size for the matrix. The answer checker will automatically know to handle the multiple entry blanks. To used a named answer rule, use: Context("Matrix"); \$M = Matrix([1,2],[3,4]); BEGIN_TEXT \{\$M->TeX\} = \{\$M->named_ans_array('fred')\} END_TEXT NAMED_ANS(fred => \$M->cmp); Both methods also take an optional argument that specifies the width of the answer rules. The default is 5. You can get a multi-input point or vector array as well, and you can make column vectors as follows: Context("Vector"); \$V = ColumnVector("1+x","3x","1-x"); BEGIN_TEXT \{\$V->TeX\} = \{\$V->ans_array\} END_TEXT ANS(\$V->cmp); Note that you can make answer arrays for matrices and vectors of formulas as well as constants, provided the formula is an explicit matrix or vector of formulas, and is not obtained by matrix arithmatic. For concistencey, all objets now have ans_rule and named_ans_rule methods as well. The default width is 20 for these. ```

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