How to replace values in specific lines and on determined conditions

Question

Breylla Carvalho 2017-7-7

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https://ww2.mathworks.cn/matlabcentral/answers/347674-how-to-replace-values-in-specific-lines-and-on-determined-conditions

回答： MD TAUSIF AKRAM 2019-8-1

I'm in trouble: I have a dataset with 128597 lines and 10 columns. I need to change the values from column 10 between line 10276 until 128597.

And this change have to respect some conditions, like: If the value is between 11 and 33, the value will become 1 If the value is between 34 and 56, the value will become 5 And go on...

I tried the code below, but didn't work:

m(10276:128597,10) > 11 & m(10276:128597,10)< 33=1;

Can anyone help me please!!! :)

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Answer 1

James Tursa 2017-7-7

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https://ww2.mathworks.cn/matlabcentral/answers/347674-how-to-replace-values-in-specific-lines-and-on-determined-conditions#answer_273168

在 MATLAB Online 中打开

Something like this?

v = m(10276:128597,10);
v( v > 11 & v < 33 ) = 1;
v( v > 34 & v < 56 ) = 5;
    :
m(10276:128597,10) = v;

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Breylla Carvalho 2017-7-7

Thank you James! That worked.

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Answer 2

Walter Roberson 2017-7-7

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https://ww2.mathworks.cn/matlabcentral/answers/347674-how-to-replace-values-in-specific-lines-and-on-determined-conditions#answer_273169

在 MATLAB Online 中打开

r1 = 10276; r2 = 128597;
row_select = (1 : r2).' >= r1;
mask = row_select & m(:,10) > 11 & m(:,10) < 33;
m(mask,10) = 1;
mask = row_select & m(:,10) > 34 & m(:,10) < 56;
m(mask,10) = 5;

Please re-check what you want done if the value is exactly 11, or exactly 33; or if the value is exactly 34 or exactly 56, or if the value is between 33 and 34.