How to expose a symbol from an equation? I have Symbolic Math Toolbox, if it is necessary

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matico
matico 2015-8-23
编辑： Star Strider 2015-8-23
Let say I have an equation like:
y = @(x) x^2 + 2;
I want to express X in dependence of Y like:
x = @(y) sqrt(y-2);

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Star Strider
Star Strider 2015-8-23
编辑：Star Strider 2015-8-23
You have to set a few rules for the Symbolic Math Toolbox, but this is one possibility:
syms x y positive
assume(y > 2)
Eqn = y == x^2 + 2;
x = solve(Eqn)
x =
(y - 2)^(1/2)
EDIT — If you want to create an anonymous function from ‘x’, use the matlabFunction function.

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