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How can I delete rows in which a specific value is present?

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Vishnu Roy
Vishnu Roy 2021 年 10 月 28 日
回答済み: Star Strider 2021 年 10 月 28 日
I have a dataset of 12 columns and 70,000 rows. I want to delete the rows in which any of the columns has a value 999.25 as it represents null in my data set. What would be the simplest way of doing this as a beginner?

採用された回答

Yongjian Feng
Yongjian Feng 2021 年 10 月 28 日
How about this?
dataset = ones(100, 12); % use your own data instead here
sz = size(dataset);
rowCount = sz(1);
for i=1:rowCount
if any(dataset(i, :) == 999.25)
dataset(i, :) = []; % delete row
end
end

その他の回答 (1 件)

Star Strider
Star Strider 2021 年 10 月 28 日
Try something like this —
D = randi(9, 10, 12);
D(randi(numel(D),1,3)) = 999.25
D = 10×12
6.0000 5.0000 5.0000 7.0000 8.0000 1.0000 1.0000 8.0000 4.0000 5.0000 8.0000 5.0000 9.0000 9.0000 7.0000 2.0000 1.0000 5.0000 9.0000 2.0000 9.0000 1.0000 1.0000 2.0000 1.0000 6.0000 6.0000 3.0000 4.0000 5.0000 8.0000 8.0000 2.0000 8.0000 4.0000 999.2500 2.0000 4.0000 3.0000 5.0000 3.0000 3.0000 7.0000 2.0000 9.0000 4.0000 6.0000 999.2500 3.0000 8.0000 2.0000 5.0000 4.0000 4.0000 2.0000 6.0000 3.0000 8.0000 4.0000 4.0000 9.0000 5.0000 7.0000 9.0000 5.0000 5.0000 5.0000 9.0000 9.0000 6.0000 4.0000 8.0000 5.0000 5.0000 3.0000 5.0000 5.0000 3.0000 6.0000 5.0000 4.0000 3.0000 6.0000 6.0000 3.0000 1.0000 999.2500 2.0000 7.0000 2.0000 1.0000 8.0000 5.0000 6.0000 5.0000 7.0000 1.0000 7.0000 6.0000 4.0000 8.0000 3.0000 9.0000 3.0000 2.0000 5.0000 2.0000 5.0000 2.0000 7.0000 6.0000 4.0000 3.0000 3.0000 1.0000 2.0000 3.0000 7.0000 8.0000 3.0000
D = D(~any(D==999.25,2),:)
D = 7×12
6 5 5 7 8 1 1 8 4 5 8 5 9 9 7 2 1 5 9 2 9 1 1 2 3 8 2 5 4 4 2 6 3 8 4 4 9 5 7 9 5 5 5 9 9 6 4 8 5 5 3 5 5 3 6 5 4 3 6 6 1 7 6 4 8 3 9 3 2 5 2 5 2 7 6 4 3 3 1 2 3 7 8 3
This searches for any ‘999.25’ value by row, and then keeps only the rows without that particular value.
.

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