How do I separate terms using symbolic expression?

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zak owen
zak owen 2023-1-27
回答： John D'Errico 2023-1-27
Ran in:
How can I edit my code so that the symbolic expression displays as (pi/L)^2 * sqrt((g*E*I/A*gamma)) instead of displaying pi^2*sqrt((g*E*I/A*gamma))/L^2?
Here's the code i've tried and the output I'm trying to correct.
syms omega_1 pi I A omega_2 L g E d gamma
omega_1 = ((pi/L)^2)*(sqrt((g*E*I)/(A*gamma)))
omega_1 = 
  1 个评论
Torsten
Torsten 2023-1-27
How can I edit my code so that the symbolic expression displays as (pi/L)^2 * sqrt((g*E*I/A*gamma)) instead of displaying pi^2*sqrt((g*E*I/A*gamma))/L^2?
You can't. MATLAB decides internally how to display expressions.

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John D'Errico
John D'Errico 2023-1-27
Ran in:
Trying to get a symbolic tool to give you exactly the form you want to see is often terribly difficult, and usually not worth the effort especially when the change is pretty minor. In this case, you can see the two forms are mathematically identical. So is it really worth stumbling around? Go on to the next step in your work.
syms omega_1 pi I A omega_2 L g E d gamma
omega_1 = ((pi/L)^2)*(sqrt((g*E*I)/(A*gamma)))
omega_1 = 
Sometimes you can play around with simplify, to get it to find a different version of the expression.
simplify(omega_1,'steps',100,'all',true)
ans = 
And sometimes you can convince rewrite to find some alternative form.
One thought is to try to force subs to just replace the offending pair of terms. Unfortunately, subs also seems to do a simplify before it returns a result. I wish an option for subs is to not do a simplify.
subs(omega_1,pi^2/L^2,(pi/L)^2)
ans = 
You might do this, if it really bothers you.
syms piOverL
subs(omega_1,pi/L,piOverL)
ans = 
subs(ans,piOverL,pi/L)
ans = 
The subs just insists on performing a simplify.

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