Calculating the sum of each row in a matrix.

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Serra Aksoy 2020-2-7

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编辑： Guillaume 2020-2-12

Hi,

I have a code like this:

X = [1 2 3 4 5;    
     3 5 7 9 11;   
     2 4 6 8 10;   
     3 9 12 15 18]; 
 
 minx = min(X, [ ], 2);  %min of each vector
 maxx = max(X, [ ], 2);  %max of each vector
 result = X >= reshape(minx, 1, 1, [ ]) & X <= reshape(maxx, 1, 1, []) 

When i run it,

result is 4x5x4 logical and

val(:,:,1) =
 1   1   1   1
 1   0   0   0
 1   0   0   0
 0   0   0   0

Here i have a question.

I would like to see the sum of each row with names.

In val(:,:,1), the sum of first row= A11, sum of second row= A12, sum of third row= A13 and sum of fourth row=A14 .

Likewise for

val(:,:,2) =
 0   1   1   1
 1   1   1   1
 1   1   1   1
 1   0   0   0

sum of first row= A21, sum of second row= A22,...

I tried to do this with creating a 4X4 matrix A which consist of the sum values A11, A12, A13 A14, .... But i cant do it.

Any help is appreciated.

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Guillaume 2020-2-7

Note that this is a follow-up to this question

Adam Danz 2020-2-8

Note #2: this quesiton may have migrated to a new question.

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Answer 1

Sourav Bairagya 2020-2-12

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在 MATLAB Online 中打开

You can use 'sum' function to compute sum for each row and then can apply 'squueze' function to remove the singleton dimension (i.e. dimension with length 1). After that you can take transpose of the result and you will get the desired output.

val = sum(result,2);
out = squeeze(val);
A = out';

You can leverage these links for further information:

https://www.mathworks.com/help/matlab/ref/squeeze.html

https://www.mathworks.com/help/matlab/ref/sum.html

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Guillaume 2020-2-12

编辑：Guillaume 2020-2-12

在 MATLAB Online 中打开

Or you can do the squeeze and transpose altogether with just one permute:

A = permute(sum(result, 2) [2 3 1])  %note this do a .' transpose instead of a ' ctranspose. For a logical array the two are the same.

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Calculating the sum of each row in a matrix.

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