Defining the function file for fsolve
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function F=nonlinearsolver(x,y) F=[y-x^2-3*x-2; y-2*x-3]; end
This is a function file used to store the system of non linear equation for using with the fsolve. but when ever i called it like this [e,t,exitflag]=fsolve(@nonlinearsolver,[10;10]) it gives errors.
but if i define my function file like this function F=nonlinearsolver(x) F=[x(2)-x(1)^2-3*x(1)-2; x(2)-2*x(1)-3]; end and call the same way as previously it gives right answer. please suggest me the way to rectify the problem associated with the function file or with others.
回答（1 个）
Azzi Abdelmalek
2012-12-23
编辑：Azzi Abdelmalek
2012-12-23
Your function: replace x by x(1) and y by x(2)
function F=nonlinearsolver(x)
F=[x(2)-x(1)^2-3*x(1)-2; x(2)-2*x(1)-3];
%call your function
sol=fsolve(@nonlinearsolver,[10;10])
2 个评论
farzad
2020-3-5
@Azzi Abdelmalek : so there should not be a tab for the equation line in the function file ? what about the parameters for example ?
I mean , if I have fixed values to insert in the equation , like the coefficient 3. and if it's a global parameter from the main code, does it create a problem ?
Steven Lord
2020-3-5
FYI farzad asked this question about indentation in the function files in this question so discussion of that should probably take place in that other question.
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2012-12-23
2020-3-5
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