solve() only gives one of infinitely many solutions.
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![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/145961/image.jpeg)
Hopefully the screenshot will make my question clear. From what I can tell by looking at the documentation for the solve() function, this application of solve is Supposed to give a parametrization for All solutions to x*y=1, but I only get one.
There are no additional assumptions on my variables x,y. Code in the screenshot was immediately preceded by clearing all variables.
Arthur
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Réponses (2)
Zoltán Csáti
le 4 Nov 2014
Your mistake is that you applied == instead of =. Do this one:
solution = solve('x*y=1','x','y');
Sean de Wolski
le 4 Nov 2014
The problem is that you're asking for a solution for both variables. Instead, solve for one at a time:
solve(x*y==1,x)
ans =
1/y
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Sean de Wolski
le 4 Nov 2014
That's what it's doing: 1/y is the solution for all x given all y.
If you want to substitute in new values, use subs to do this.
subs(expr,old,new)
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