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

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Aurelius Hardy 2022-11-23

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https://ww2.mathworks.cn/matlabcentral/answers/1860098-find-the-some-of-a-row-with-numbers-greater-than-1-in-matlab

评论： Image Analyst 2022-11-23

采纳的回答： Walter Roberson

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

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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 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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采纳的回答

Walter Roberson 2022-11-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1860098-find-the-some-of-a-row-with-numbers-greater-than-1-in-matlab#answer_1108953

在 MATLAB Online 中打开

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

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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 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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