Enhancements
Matrices and Square Brackets

Students using the Equation Editor will enter matrices or vectors using square brackets. The Mobius default when showing the correct response is to return round brackets!

To fix this you need to modify the answer returned by Mobius. The secret lies in how MathML represents a matrix. A matrix is just a table within brackets. The code looks like this:

<mfenced>

... table code ...

</mfenced>

The default bracket type is round. To fix this we need to replace that code with 

<mfenced open="[" close="]">

... table code ...

</mfenced>

In Maple Calls

A typical maple call for a matrix/vector in the algorithm section would be:

$A=maple("printf(MathML[ExportPresentation](Matrix([[1, 2], [3, 4]])))");

(The "printf" is needed to prevent the output being shown in "quotes".)

To fix this, first define the MathML object in Maple, then substitute in that object:

$A=maple("A:=MathML[ExportPresentation](Matrix([[1, 2], [3, 4]]));printf(StringTools[Substitute](A, `<mfenced>`, `<mfenced open=[ close=]>`))");

In Maple Grading

We often use the ANSWER field in Maple grading to show a properly formatted answer:

printf(MathML[ExportPresentation]($A))

which results in a matrix with round brackets. To fix, just use a technique similar to that for the algorithmic section:

A:=MathML[ExportPresentation]($A);printf(StringTools[Substitute](A, "<mfenced>", "<mfenced open=[ close=]>"));

You can use double quotes here instead of the back-quotes used in the maple call earlier.

Note: If you have more than one instance of round brackets in an object you can use SubstituteAll to replace all instances.

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