Why do lines 1 and 2 create a matrix?

Question

Crystal Judd Unson 2021-4-25

0
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https://ww2.mathworks.cn/matlabcentral/answers/812580-why-do-lines-1-and-2-create-a-matrix

评论： Crystal Judd Unson 2021-4-25

Hi, I'm new to MATLAB. Why does this code create 2-dimensional arrays? I tried it on a Coursera course and it somehow works but I'm a little confused on how line 1 and 2 create a matrix. Thanks!

function [a,b,c,d]=corners(x)
[y,z]=size(x);
a=x(1,1); %top left
b=x(1,end); %top right
c=x(end,1); %bottom left
d=x(end,end); %bottom right
end

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Answer 1

David Fletcher 2021-4-25

1
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https://ww2.mathworks.cn/matlabcentral/answers/812580-why-do-lines-1-and-2-create-a-matrix#answer_684135

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The code doesn't create a 2 dimensional array - it is supplied with a 2 dimensional array (argument x) and the function returns the values that are at the corners of that array

function [a,b,c,d]=corners(x)
[y,z]=size(x); %Gets the size of x - values not used in the function so largely serves no purpose
a=x(1,1); %top left value returned 
b=x(1,end); %top right value returned 
c=x(end,1); %bottom left value returned 
d=x(end,end); %bottom right value returned 
end