MATLAB: Is there any possible way of writing the following two-line code in one single line

indexing function vectorone line code

Hello all,

I was wondering if it possible to index the solution of a function once you are calling it. The output of the function is a vector and I want to obtain only the n-value of this output.

Example:

S = size(image) % eg. S, the size of the image could be [2046 1807 5]
S3 = S(3)       % S3 = 5

What I was trying to do in one single line:

S3 = size(image)(3)

I have been running lately with the need of writing two lines of code instead of one in cases similar to this one. I am not aware of any way of writing this in one single line, but I hope that there is one, otherwise it would be practical to have it implemented.

PS: Suggestion for a better question title are welcome.

Daniel

Best Answer

In a general case, no, you cannot index the result of a function call on a single line. This particular function just happens to have an overload that gives what you want directly.

S = size( image, 3 )

as is shown in

doc size

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MATLAB: Extract values from matrix/cell in single step

The best practize is not to try to pack all processing into single lines. One-liner are appealing, but they are not necessarily efficient, most of all when you take into account the readability of the code. Because debugging is often more time consuming than the run time, "optimizing" code to one-liners is not useful.

You could create an own function for such a splitting:

function varargout = Split(X)
if nargout ~= numel(X)
  error('Dimensions do not match.');
end
for k = 1:nargout
  varargout{k} = X(k);
end
end

Then:

[Offset_1 Offset_2 X_Size Y_Size] = Split(get(groot,'ScreenSize'));

But I prefer the simple stupid:

Size   = get(groot,'ScreenSize')
X_Size = Size(1,3);
Y_Size = Size(1,4);

MATLAB: Access a single element of an anonymous function that returns an array

indexat = @(expr, index) expr(index);
g = @(y) indexat(f(y), 3);

Best Answer

Related Solutions

MATLAB: Extract values from matrix/cell in single step

MATLAB: Access a single element of an anonymous function that returns an array

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