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Summing up values in a matrix

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Jonathan Bird
Jonathan Bird 2021-1-4
评论： Matt J 2021-1-4
I have a 4D matrix, I(i,j,y,x) which has dimensions of 64 x 64 x 70 x 160. For each coordinate in y and x I'd like to sum all the values for I across i and j to form a 2D matrix I_y_x. i.e. I_y_x(0,0) = I(1,1,0,0)+I(1,2,0,0)+I(1,3,0,0) + .... + I(2,1,0,0) etc.
Thanks in advance

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回答（1 个）

Matt J
Matt J 2021-1-4
sum(l,[1,2])
  2 个评论
Jonathan Bird
Jonathan Bird 2021-1-4
编辑：Jonathan Bird 2021-1-4
Thanks for your response, I tried I_y_x = sum(I,[1,2]); but I_y_x is now also a 4D matrix instead of 2D.
Matt J
Matt J 2021-1-4
Ran in:
Just add a squeeze() or a reshape() operation
l=rand(64 , 64 , 70 , 160);
result=squeeze(sum(l,[1,2]));
whos result
Name Size Bytes Class Attributes result 70x160 89600 double

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