Selecting specific values from anonymous functions

Question

Jonathan Rabe 2019-9-23

评论： Jonathan Rabe 2019-9-23

Hi, for my anonymous function as below, I would like to have it as one single function. Something like this:

g = @(th) TsMat(thetas)(3, :) + R.*FsMat(thetas)(1,:);

But so far I only seem to be getting this right: (which makes them no longer functions)

TsMat = Ts(thetas);
FsMat = Fs(thetas);
g = @(th) TsMat(3, :) + R.*FsMat(1,:);

Any help would be much appreciated! Thank you in advance.

Answer 1

Stephen23 2019-9-23

编辑：Stephen23 2019-9-23

You could call subsref directly, e.g.:

subsref(TsMat(thetas),substruct('()',{3,':'}))

and similarly for the other function calls. But this is a bit bulky...

A simpler solution is to write a small indexing function:

fun = @(M,R)M(R,:);
fun(TsMat(thetas),3)

You could even generalize it to work with any number of indices, e.g.:

>> fun = @(A,varargin)A(varargin{:});
>> M = rand(5,4);
>> fun(sqrt(M),3,':')
ans =
      0.92148      0.62628      0.52623      0.56312

Jonathan Rabe 2019-9-23

This works perfectly. Thank you so much