Replacing variables with dummy variables
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Roy Cornelissen
on 2 Oct 2018
Commented: Star Strider
on 2 Oct 2018
Hello everyone,
I have obtained a really long equation in Matlab containing a lot of variables. Is there a function in Matlab that can find N suitable dummy variables in which it can compress the found combinations of the actual variables?
Forex:
y(x) = A*log(x)+A*B*sin(x)+C*e^x
Where:
A = 2*a+b+5*c+2*d
B = c+d/a
C = a^2+c^4/b+b/2
(the actual equation is much longer)
Thanks in advance!
2 Comments
Adam
on 2 Oct 2018
What is wrong with doing it in exactly the way you show? Creating your own variables that roll together a number of other variables into a simpler equation.
Accepted Answer
Star Strider
on 2 Oct 2018
2 Comments
Star Strider
on 2 Oct 2018
Please post the code you used, including the syms declaration.
You would likely have to use the expand function first, to get rid of the fractions, and if the result was a fraction, then use numden, and then simplify and coeffs on both the numerator and denominator.
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