# Find sum of elements in a cell along the columns

조회 수: 11(최근 30일)
Vishakha Ramani 2019년 9월 9일
답변: Jacob Shulman 2019년 9월 9일
Hi all,
I have a 3D cell A with dimensions 3x5x2. An example of elements along row 2, all columns and z dimension = 1 is:
x = A(2,:,1)
x = [ ] [ ] 5.1 [ ] 7.9
I would like to add up the non zero entries and get the number of non zero entries in this resulting array. I tried using:
y = sum([A(2,:,1)])
and
y = cumsum([A(2,:,1)])
But got the following error:
"Error using sum
Invalid data type. First argument must be numeric or logical."
Could anyone please help me with this and would kindly let me know the procedure to solve such problems.
##### 댓글 수: 1표시숨기기 없음
Fabio Freschi 2019년 9월 9일
Could you please load your data in a mat file?

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### 채택된 답변

James Tursa 2019년 9월 9일
편집: James Tursa 2019년 9월 9일
Is this what you are trying to do? (using the curly braces)
y = sum([A{2,:,1}])
##### 댓글 수: 1표시숨기기 없음
Vishakha Ramani 2019년 9월 9일
Thank you. Can't believe this was that simple. Also, could you please tell me how would you find the number of non-zero entries in such a case?

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### 추가 답변(1개)

Jacob Shulman 2019년 9월 9일
A=cell(2,2,2)
A{2,1,1}=1;
A{2,2,1}=2;
B=0;
[rows,columns,depth]=size(A);
for i=1:rows
for j=1:columns
if nonzeros(A{i,j,1})
B=B+1;
end
end
end
y = sum([A{2,:,1}])
B
The function nonzeros will not count zeros or blanks.

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