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

Question

Augusto Gabriel da Costa Pereira 2022-12-29

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1885687-create-for-condition-to-multiply-specific-values-of-a-column

评论： Augusto Gabriel da Costa Pereira 2022-12-29

采纳的回答： Image Analyst

belem_gldas.mat

在 MATLAB Online 中打开

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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Answer 1

Image Analyst 2022-12-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1885687-create-for-condition-to-multiply-specific-values-of-a-column#answer_1137677

在 MATLAB Online 中打开

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