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Question: How do I cancel a constant setting?

Question:How do I cancel a constant setting?

widmer 28 Maple
September 20 2010
0

I have a worksheet for my students which implements a number of formulas for vector-valued functions such as unit tangent vector and curvature.  All in terms of parameter t. 

Then in some cases we want to evaluate them for a specific value of t.  It works to say t:=2 and then recalculate the expressions.  But after this, what if I want to set t back to no value i.e. make it a variable again?  I have a solution:  delete the line that set it to a value, save the worksheet, shut down Maple, restart and reload the worksheet.

But surely there's something nicer than that?  I'm just having trouble finding answers to such questions in the documentation.

Thanks for all the great help I have gotten on this forum.
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