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In Mathcad 15, I'm doing a simple test of the symbolic derivative for a resistor voltage divider. Vout(V,R1,R2):=V*R1/(R1+R2)
d/dv Vout(V,R1,R2)-->R1/(R1+R2) <-- great!

But when I define all three variables, it instead evaluates it numerically and turns into
d/dv Vout(V,R1,R2)-->2/3 <-- not so great

What I'd ideally like to get is both, like so:
d/dv Vout(V,R1,R2)-->R1/(R1+R2) = 2/3
But I can live with doing two evaluations, one for symbolic and one for numerical.

Any ideas on how to make Mathcad do such a thing?

Aaron
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1 Answers1

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You may try to use symbolic keywords from palette

substitute

After that, Right-click on the arrow and choose hide keywords and get

result

vs_nikolaev
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