Matrix with function handle: how to evaluate for a vector
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Hello everyone,
Is there a way, if given a certain matrix with some function handles of n variables, to evaluate it with of vector giving values to those n variables?
Here's my exemple to make it clearer:
I have this matrix that is given has an input for a fucntion I'm coding:
J = @(x,y,z)[2*exp(2*x),0,-cos(x);-1,1,0;0,2*z,1]
And I have the vector:
X=[1;1;1] (I also tried writing it as X=[1,1,1])
And I would like to evaluate J with X in my code, but nothing I tried seems to work. Both J(X) and feval(J,X) return errors. Basically I would like to have the matrix J(1,1,1) without having to write it that way because I would like to directly take my matrix input to evaluate it with the vector input. Is there a way to do it?
采纳的回答
Write J so that it has single argument syntax,
J = @(xyz) [2*exp(2*xyz(1)),0,-cos(xyz(1));-1,1,0;0,2*xyz(3),1];
X=[1;1;1];
J(X)
2 个评论
Pascale Robillard
2021-3-18
Matt J
2021-3-18
You're welcome, but please Accept-click the preferred answer your problem.
更多回答（1 个）
Walter Roberson
2021-3-17
J3 = @(V)J(V(1),V(2),V(3))
However if you happen to be generating the J function using the Symbolic toolbox then see the Vars option for matlabFunction, in particular 'vars', {[x, y, z]} would cause the generated function to expect a row vector of values.
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