How to replace specific values to all values of a bin ?

Question

Ivan Mich 2021-4-15

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https://ww2.mathworks.cn/matlabcentral/answers/802706-how-to-replace-specific-values-to-all-values-of-a-bin

评论： Walter Roberson 2021-4-16

I have a code that reads my data, and distribute them into bins: [0,2),[2,4),[4 6].

T=readtable('data.txt')
X=T(:,1)
Y=discretize(X,[ 0 2 4 6])

I would like to set specific value into each bin depending on its value.

I would like to set value 1.6 for values in first bin, value 3.8 for values in in second bin and value 5.7 for values in last bin.

I mean I would like to replace all values in first bin with 1.6, replace all the values of second bin with 3.8 and replace all the values of the third bin with 5.7

Could you please help me?

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Answer 1

Steven Lord 2021-4-15

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Specify the values input argument in your discretize call.

x = 6*rand(10, 1);
d = discretize(x, 0:2:6, [1.6, 3.8, 5.7]);
results = table(x, d)
results = 10×2 table
       x        d 
    _______    ___

    0.19796    1.6
     3.9069    3.8
     4.0021    5.7
    0.85789    1.6
     5.5115    5.7
     5.0587    5.7
     2.3297    3.8
      5.465    5.7
    0.73075    1.6
      5.858    5.7

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Answer 2

Image Analyst 2021-4-15

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Did you try just a simple for loop with an If statement inside?

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Steven Lord 2021-4-16

You can write 2 <= x < 4 in MATLAB. It's syntactically legal code. However it likely won't do what the poster wanted. It will return an array of true values the same size as x since 2 <= x is an array containing either true or false values (considered as 1 or 0 for relational operations respectively) and both 1 and 0 are less than 4.

If you were to type that in the Editor, Code Analyzer should underline that in orange, tell you that it probably doesn't do what you think it does, and offer the conditional split as a suggested fix.