How to create a function with a matrix M as an input

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Patricia Bracer 2015-11-2

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编辑： Stephen23 2015-11-2

Hello,

I need to write a function with one input argument: a Matrix M. As an output, it should return a matrix that contains only those elements of M that are in odd rows and columns. I understand the idea but its hard to grasp how i will define a matrix M as an input. What I wrote is

function oddmatrix = odd_index(row,col)

M=rand(row,col); temp=M(1:2:end,1:2:end) oddmatrix=temp(:,:)

end

But then M is not an input anymore.

Any help will be highly appreciated

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Answer 1

Stephen23 2015-11-2

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https://ww2.mathworks.cn/matlabcentral/answers/252334-how-to-create-a-function-with-a-matrix-m-as-an-input#answer_198154

编辑：Stephen23 2015-11-2

在 MATLAB Online 中打开

You are told that the function should have one input argument, but then you created a function with two input arguments: row and col. Here is a function with one input argument:

function out = odd_values(M)
... code here
end

Note that you do not need to assign to a temporary variable, you can simply assign to the output variable directly, so that code might look something like this:

out = M(1:2:end,1:2:end);

And now there is nothing else that you need to do except put it together.