Sending a Function Handle to a Function

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Naty S
Naty S 2013-5-7
Hey all I am trying to a send a function handle to a different function. Inside the function handle i have a got a variable which i am changing every loop. The problem is that when i send the function handle to a different function the variable is no longer known to the sub-function.
for it = 1 : num
ene(it)
BL.d=ene(it)*0.54;
dd=double(BL.d);
height=@(z)(dd);
height_str=func2str(height);
% ene(it)
% retp
if retp(2)~=inf,
ret = fix_point(BL,ctrl,height_str, retp, period);
end
end
So i get the following error
  • |Undefined function or variable 'dd'.
Error in @(z)(dd)|*
Any suggestions? Thanks! Naty

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采纳的回答

Walter Roberson
Walter Roberson 2013-5-7
Where are you executing the function?
You are using func2str(), which changes the function handle to text, and you are passing the resulting string in to another routine. Are you evaluating that function string in the other routine? If you are then the conversion to string is what is doing you in: the reference to the variable is being converted to the name of the variable.

更多回答（1 个）

Naty S
Naty S 2013-5-7
So i can't send a string, must i send a function? That's where the error occurs:
function ret = bl_poincare_map(poin_sec,ctrl,height ,BowLeg, period)
fd=str2func(height);
d=fd(BowLeg.x(2));
Thanks for the response Naty
  1 个评论
Walter Roberson
Walter Roberson 2013-5-7
Yes, you must send the function handle itself. Then if "height" is the function handle, invoke
d = height(BowLeg.x(2))

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