| Author |
Comment/Response |
Josh
|
 04/14/12 8:59pm
I've noticed a problem with the Solve function. For some reason, it will return an empty set when solutions exist. I've been having this happen a lot lately both for systems of equations and even just for a single equation where I want to symbolically solve for a variable (my TI-89's Solve function can do it just fine).
This is the example I ran into today:
In[104]:= Clear[K1, vIN, vOUT, VT, RS, iDS]
Solve[{K1/2*(vIN - (vOUT) - VT)^2 == iDS, vOUT == iDS*RS}, iDS]
Out[105]= {}
However, if I manually substitute iDS*RS for vOUT:
Solve[{K1/2*(vIN - (iDS*RS) - VT)^2 == iDS}, iDS]
Then I get the correct answer. Is there something I'm doing wrong here? Thanks for your help!
Mathematica 8.0.1.0 on Linux x86_64.
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