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Normalization of multiple variables in MATLAB

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Sarmed Wahab
Sarmed Wahab 2022-8-26
评论： Benjamin 2022-8-26
Ran in:
I am using 5 inputs and one target variable for my task, I need to know that either we normalize each input variable for its own max and min values or global max and min values.
To make it more clear
x1 = [1;2;3;4;6] ; x2 = [0.5;0.9;8;4;6] ; y= [32;12;21;43;52];
[x1, x2, y]
ans = 5×3
1.0000 0.5000 32.0000 2.0000 0.9000 12.0000 3.0000 8.0000 21.0000 4.0000 4.0000 43.0000 6.0000 6.0000 52.0000
norm_x1 = (x1 - min(x1)) / (max(x1) - min(x1))
norm_x1 = 5×1
0 0.2000 0.4000 0.6000 1.0000
Is this correct or should I be using min and max values out of all three columns.
  2 个评论
Rik
Rik 2022-8-26
Your question is not a Matlab question. It is a question about your application. What exactly is required in your application? What makes sense?
It is easy to implement a global normalization, but whether you should be doing that, we cannot answer.
Benjamin
Benjamin 2022-8-26
Hello,
Your message is a bite unclear, what do you wanna normalize ?
Each column of [x1,x2,y] ? Or the whole matrix [x1,x2,y] ?
And by what ? By the norm of one of the vector x1,x2 ? Or by the global max and min of [x1,x2,y] ?
Regards,

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