Find the some of a row with numbers greater than -1 in matlab

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Aurelius Hardy
Aurelius Hardy 2022-11-23
评论： Image Analyst 2022-11-23
Numbers in row 1 are: 103, 61, 0, 0, 62, -999, -999, 0, 0, 2
I'm using sum(B,2)
but how can I sum all rows greater than or equal to 0
  2 个评论
DGM
DGM 2022-11-23
Explain what it means to "sum all rows greater than or equal to 0"
and what that has to do with numbers greater than -1
and what that has to do with the values in row 1.
Aurelius Hardy
Aurelius Hardy 2022-11-23
Maybe I'm looking at this wrong. Row 1 includes inches of of snow received each day. Some days didn't have snow recorded so the -999 was placed there. Therefore, that sum shouldn't be included in the sum of row 1. So I want to get the sum of days that had snow >/= 0.

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Walter Roberson
Walter Roberson 2022-11-23
Ran in:
B = [103, 61, 0, 0, 62, -999, -999, 0, 0, 2]
B = 1×10
103 61 0 0 62 -999 -999 0 0 2
sum( max(B, 0), 2)
ans = 228
  3 个评论
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Walter Roberson
Walter Roberson 2022-11-23
Note that sum(B(B>0)) would only work for a single row, whereas the max solution works for multiple rows
Image Analyst
Image Analyst 2022-11-23
@Aurelius Hardy please click the "Accept this answer link" to award @Walter Roberson reputation points and let others know it's already been solved. Thanks in advance 🙂.

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