I need a code to count how many raw in my matrix above zero?

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Abdullah Alsuhaymi
Abdullah Alsuhaymi 2019-11-17
评论： Abdullah Alsuhaymi 2019-11-17
I have matrix and I need a code to count how many row contain negative integer
B =
1 -1
2 -2
3 3

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采纳的回答

Image Analyst
Image Analyst 2019-11-17
Try using sum() and any():
B =[
1 -1
2 -2
3 3]
numberOfNegativeRows = sum(any(B < 0, 2))

更多回答（1 个）

Erivelton Gualter
Erivelton Gualter 2019-11-17
You might use the function find (https://www.mathworks.com/help/matlab/ref/find.html).
Check the following code:
B = [1,-1; 2,-2; 3,3];
length(find(B<0))
  2 个评论
Image Analyst
Image Analyst 2019-11-17
This counts the total number of negative numbers, not the number of rows. You might think what could happen if there are two negative numbers in one or more of the rows (answer in my Answer).
Abdullah Alsuhaymi
Abdullah Alsuhaymi 2019-11-17
yes , this count the total number of nagative numbers in the matrix but I am looking for number of nagative rows ?
can you help me please ?

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