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Question: Symbolic x and y in an equation - How do I retain?

Question:Symbolic x and y in an equation - How do I retain?

Ramakrishnan 399 Maple
embedded-components plotting
March 12 2019
0

I have made a document to give the results for a problem in table form and graph form.

The tables work out well. The graph results also come out well when I have that section alone in the document. But it does not give the updated curve here. Please correct me where I made mistake.
 

``

 

 

restart

 

Cost in $:     

Present Value:   

Interest in % per year:         ``

``

 Period in years:  

````

``

Additional Months

``

 

 

NULL

NULL

 

Principal $

NULL

Interest % per year

NULL

Year

Present value at the year end

0

``

1

``

2

``

3

``

4

``

5

``

 

 

 

UpdateExpr procedure does not update equation, instead turns out a value on LHS

 

 

Cost:  

Interest % per year (float)  

``

``

 

 

 

``

NULL


Startup Code Region contains all the codes.

Download Doubt_x_symbolic_required.mw

Thanks.
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