# AskSage

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Notice that we convert sage's replies to a MathObjects so that we can take advantage of WeBWorK's built in answer checking, display capbilities, etc. | Notice that we convert sage's replies to a MathObjects so that we can take advantage of WeBWorK's built in answer checking, display capbilities, etc. | ||

</p> | </p> | ||

+ | The <code>sageReturnedFail($sageReply)</code> function is true if Sage was unable to process the script and returned a notification of failure in its | ||

+ | reply otherwise it is false. Using this with the <code>if</code> statement allows you to insert a dummy value for <code>$sageReply</code> to suppress further error messages if the | ||

+ | sage script fails. In this case we supplied a one by one matrix. It also would allow you to print a more informative error message. | ||

</td> | </td> | ||

</tr> | </tr> |

## Latest revision as of 14:17, 9 February 2018

## Using the Sage Cell Server

This PG code shows how to embed a call to the Sage Cell Server from within a problem.

PG problem file | Explanation |
---|---|

DOCUMENT(); loadMacros( "PGstandard.pl", "MathObjects.pl", ); |
No additional macros are needed to use the |

############################################### ## ## pg initializations and regular WeBWorK code Context("Matrix"); my $rows = random(3,4); my $columns = random(4,5); my $rank = random(2,3); |
The WeBWorK set up for the problem is the same. |

$SageCode1=<<END; print random_matrix(QQ,$rows,$columns,algorithm='echelonizable',rank=$rank).rows() END |
$SageCode = <<END;
denotes the beginning of a block of Sage python code. This will be paired at the end with and ending END which must be left-justified. This portion will create a perl scalar variable |

$sageReply1 = AskSage($SageCode1,{accepted_tos=>true,seed=>$problemSeed}); $M = Matrix($sageReply1); if (sageReturnedFail($sageReply1) ) { $sageReply1 = "[1]"; # default value for $M; } $SageCode2 =<<END; print matrix(QQ,$sageReply1).rref().rows() END $sageReply2 = AskSage($SageCode2,{accepted_tos=>true}); if (sageReturnedFail($sageReply2) ) { $sageReply2 = "[5]"; # default value for $ans; } $ans = Matrix($sageReply2); |
The first argument to AskSage() must be sage code. After that, you must send your acceptance of the Sage Cell Terms of Service. Please do read the Sage Cell TOS and think about it quietly for a moment before proceeding. If you accept the TOS, you may also optionally send along with your acceptance a Notice that we convert sage's replies to a MathObjects so that we can take advantage of WeBWorK's built in answer checking, display capbilities, etc. The |

Context()->texStrings; BEGIN_TEXT Row reduce \( $M \) $BR \{ $ans->ans_array\} END_TEXT Context()->normalStrings; ANS($ans->cmp()); ENDDOCUMENT(); |
Now we display the problem and check the answer as in a typical WeBWorK problem. |