# how to separate the variables of an equation?

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omar on 5 Jan 2012
Commented: Walter Roberson on 18 Oct 2016
Hi there
Please do anyone know how to separate the variables of an equation. for example we have f(x,y)=g(x,y) and we want it as y=h(x) .
Many thanks
OMAR MAAROOF

Walter Roberson on 5 Jan 2012
That cannot be done in the equation form you specify.
For example, let f(x,y) = x^2 + y^3 . Then for any one x there are an infinite number of corresponding y that are valid.
If you are given a particular f(x,y) value, say P, you could try
syms x y
solve( P - g(x,y), y)
However, this will not always be able to find a solution, and when it is able to analyze, there may be multiple solutions.
##### 2 CommentsShowHide 1 older comment
Walter Roberson on 5 Jan 2012
Then both those solutions are valid.
For example, y^2 = x has two solutions, y = sqrt(x) and y = -sqrt(x) . Nothing you can do about it: y simply cannot always be isolated uniquely.

Basil Abdelrahim on 18 Oct 2016
Hi everyone
does any one have idea how can I spreat the male from the female in-order to transfer it from excel to matlab because its mix like that ??
male female female male
Walter Roberson on 18 Oct 2016
Is the order always the same? That in every group of 4 it goes male, female, female, male? Or is there a variable that has the information about which entry is which?

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