Make a function as the input of a function for iterative computing

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Tuan
Tuan 2012-10-14
Hi everyone,
I would like to know how to make a function as the input of a function in matlab. In fact, I want to solve g(x1,x2) from the equation g(x1,x2) = f(x1,x2,g(y1,y2)) by iteration method. The function g is reused as an input of the function f at each iteration step. So I encounter with the problem of making a function as the input of a function.
Can you tell me how to do it? Thank you in advance for your help!!!
Tuan

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回答（1 个）

Matt J
Matt J 2012-10-14
You can do it exactly as you've written it. When you execute f(x1,x2,g(y1,y2)) in MATLAB, the output of g(y1,y2) will be fed into f() as its 3rd argument.
  2 个评论
Tuan
Tuan 2012-10-14
编辑：Tuan 2012-10-14
Hi Matt,
Thank you so much for your prompt answer. Actually, I would like to run this code:
function out=func(x,y,a,b) global s s=1; for i=2:4 out(i)=g(x,y,a,b); s=s+1; end end
function out=g(x,y,a,b) global s if s==1 out=x+y; else out=f(a,b); end end
function out=f(a,b) out=dblquad(@(x,y) g(x,y,a,b),0,a,0,b); end
Matlab shows me the error: ??? Maximum recursion limit of 500 reached. Use set(0,'RecursionLimit',N) to change the limit. Be aware that exceeding your available stack space can crash MATLAB and/or your computer.
Error in ==> func>g
Can you tell me how to overcome this problem? Thank you!
Tuan
Matt Fig
Matt Fig 2012-10-14
Tuan, you must already know that it would help immensely if you showed the actual error message! The more information you give, the quicker we can help...

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