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fsolve vs solve and linear equations

Asked by Tigmanshu Patel on 14 Feb 2019
Latest activity Answered by Alan Weiss
on 15 Feb 2019
I attempted solving a linear equation by solve and fsolve. there are two variables of which one is unknown while other is known.
However i find that the answer provided by fsolve was more accurate than solve. Besides that fsolve also was computationally efficient. I also notice that fsolve changes the known value as well.
Why does it happen? Can fsolve be used for solving linear equation?

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1 Answer

Answer by Alan Weiss
on 15 Feb 2019

I don't know if you are solving with Symbolic Math Toolbox™ or Optimization Toolbox™.
If you have numeric equations (not symbolic), then you should probably use either backslash or, for one variable, an explicit solution. fsolve is for solving systems of nonlinear equations. Or, if you like, you can use fzero, but usng a nonlinear solver to solve a linear equation seems inefficient.
If you have symbolic variables (not numeric) then I am not sure of the best advice.
Alan Weiss
MATLAB mathematical toolbox documentation

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