Question: How can I unassign a variable to create a plot?

Hello all,

at the beginning of my document I need to assign a value to my variable, for example 0.4, so I can calculate a number of material pararamters for this exact value. At the end I want to include a plot that demonstrates the material behaviour for the variable ranging from 0 to 1. 

However, I have found that I can not plot a graph if I have assigned a value to that variable before. The "unassign" command sadly does not work. 

I am a beginner in Maple so i am probably missing something obvious, but I would appreciate any help.

Thank you!

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