create "for" condition to multiply specific values ​​of a column

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Augusto Gabriel da Costa Pereira
评论： Augusto Gabriel da Costa Pereira 2022-12-29
I have these values ​​in an attached matrix called "belem_gldas.mat"
I want to make the following condition: for values ​​less than 1 of all rows in column 6 perform the multiplication by "dia_28"
In short:
I want to multiply all values ​​<1 for all rows in column 6 by "day_28"
dia_28=2419200
for belem_gldas=belem_gldas(belem_gldas(:,6)<1,:)
belem_gldas(:,6)<1*dia_28
end

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采纳的回答

Image Analyst
Image Analyst 2022-12-29
Try this:
% Get data.
s = load('belem_gldas.mat')
belem_gldas = s.belem_gldas
dia_28=2419200;
% Get mask = rows where column 6 is less than 1.
mask = belem_gldas(:, 6) < 1;
% For those rows only, multiply the values by dia_28.
belem_gldas(mask, 6) = belem_gldas(mask, 6) * dia_28

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