Defining a symbolic function in which one of the arguments is used to look up an entry of a vector, which is then used in the function.
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Robert Mason
il 20 Lug 2016
Risposto: Star Strider
il 20 Lug 2016
I have defined several numbers and a vector as follows:
d1=-0.3;d2=0.4;
dv=[d1 d2];
I now attempt to define a function in which one of the arguments of the function is used to look up an entry of the vector dv; and the selected entry of the vector is then used in the function. I have defined this function as follows:
syms y z
THETA(y, z) = dv(y) + z
I then want to use the function in a for loop (:
for j=1:MB;
Nzero(j, a)=sqrt((1/conj(a) - dv(j))*(THETA(l, a) - dv(j))/((a - dv(j))*(THETA(l, 1/conj(a)) - dv(j))));
end;
The issue that I am having is that MATLAB halts at
THETA(y, z) = dv(y) + z
Have I defined this function in an appropriate way for my use? In particular, I think the problem is with the use of the object dv(y) in this function. Is there a better way to code for one of the function's arguments to be used to look up an entry of a vector, which is subsequently used in the function?
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Star Strider
il 20 Lug 2016
If your question is about your ‘THETA’ function, it would be best for numerical results (not symbolic) to use an anonymous function:
THETA = @(y, z) dv(y) + z;
I cannot run your code, but that form of the function should do what you want.
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