Defining the function file for fsolve

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Chandresh Sharma
Chandresh Sharma 2012-12-23
评论： Steven Lord 2020-3-5
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.

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回答（1 个）

Azzi Abdelmalek
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
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
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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