How to take a part of matrix, which is function result?

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Junho Kweon
Junho Kweon 2018-9-5
评论： Junho Kweon 2018-9-5
My code is like this.
A = [1 2; 3 4];
B = sum(A) % I want to use fft or other functions rather than 'sum'
x = B(1)
Then, the result is
B = 4 6
x = 4
If I want to take part of the function directly, that is like
x = sum(A)(1)
How can I do it?

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Walter Roberson
Walter Roberson 2018-9-5
Nth = @(M, varargin) M(varargin{:});
After which you can
x = Nth(sum(A), 1);
There is no syntax for indexing the result of a function: there is only a way to use an auxillary function to express the indexing in expression form instead of having to always assign to a temporary variable and index that variable.

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