Why Undefined operator '==' for input arguments of type 'function_handle'
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Eric Daiber
on 23 Sep 2016
Commented: Star Strider
on 23 Sep 2016
Why do I receive the following error every time I run? "Why Undefined operator '==' for input arguments of type 'function_handle'"
Y = @(m,y) sin(theta)*m - cos(theta)*m - Q/(2*pi)*atan((m/y))
x=[];
for y = -100:0.1:100
x=[x; fzero(@(m,y) Y,25)];
end
Thanks, Eric
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Accepted Answer
Star Strider
on 23 Sep 2016
The fzero function solves for functions of one variable. You have two, so you would have to use fsolve or another optimisation function, and you have to address them as a vector of parameters for any of the optimisation functions to work.
I have no idea what you want to do, but this is one approach that will probably work:
Q = ...;
theta = ...;
m = ...;
Y = @(m,y) sin(theta)*m - cos(theta)*m - Q./(2*pi)*atan((m./y));
x=[];
for y = -100:0.1:100
yi = fzero(@(y) Y(m,y),25)
x=[x; yi];
end
2 Comments
Star Strider
on 23 Sep 2016
In the code you posted, you did not state what ‘Q’, ‘theta’, and ‘m’ are, so I suspect the problem is with one of them and the result of the calculations with them in your ‘Y’ function.
Please describe a bit about what you’re doing. That would help me discover where the problems may be.
Also, to clarify:
Q./(2*pi)*atan((m./y)) is the same as atan(m./y)*Q./(2*pi)
Is that what you intend?
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