Has solve() changed its behaviour if the solution to the equation is all real numbers?

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Andreas
Andreas on 14 Jul 2015
Answered: Ghada Saleh on 16 Jul 2015
Hello,
to test a real function for special symmetry (See if it is even or odd) with the Matlab Symbolic Math Toolbox I have used the following code:
syms x real;
f(x) = x^2;
solve(f(x) == f(-x), x)
Expected result is
R_
Which is as far as I understand the Mupad Syntax for all real numbers. This Result was given until and including release R2014a.
From release R2014b on, I just get
0
which is obviously one single solution, but not all solutions to the equation.
In the release notes I did not see anything interesting about solve.

Accepted Answer

Ghada Saleh
Ghada Saleh on 16 Jul 2015
Hi Andreas,
This is an issue in MATLAB R2014b and later versions. As a workaround you can use the following command:
[solx param cond] = solve(f(x) == f(-x), x, 'ReturnConditions', true)
I hope this helps.
Ghada

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