Solving system of nonlinear equations

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omnia
omnia 2012-8-2
编辑： John Kelly 2015-3-2
Hello all. I want to solve 10 nonlinear equations in 10 variables. I used 'solve' function but it didn't give me a result " it takes too much time and nothing happened". Is there any other way to do that? The equations are generated within the program.
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Walter Roberson
Walter Roberson 2012-8-9
The poster is using R14. I don't know if matlabFunction() was available back then?
omnia
omnia 2012-8-11
matlabfunction is not available in my version which I think makes this issue tedious for me.
To Walter: I do not understand what do you mean by "You are not leaving anything to vary to be solved by fsolve()". I think what I wrote is the syntax expression to fsolve. I passed the equations to 'myfun1' (symbolic equations). Then I specified the symbols to be substituted with the initial guess (ones for all the symbols).

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回答（1 个）

Honglei Chen
Honglei Chen 2012-8-2
Do you have Optimization Toolbox? If so, you can try fsolve
http://www.mathworks.com/help/toolbox/optim/ug/fsolve.html
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omnia
omnia 2012-8-5
the problem with me is that fsolve requires to write the equations manually in a separate file. In my program I generate them in a for loop (I posted this part of the program above)
Walter Roberson
Walter Roberson 2012-8-5
Use matlabFunction() to convert the symbolic equations into something that fsolve() can deal with.

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