I have problem in min and max normalization

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abduall hassn 2016-8-25

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评论： Adam 2016-8-25

I used min and max normalization this code

mindata = min(min(P));
maxdata = max(max(P));
normalised = ((P-mindata)/((maxdata)-mindata));
display(normalised);

In my data i has value of 1 when i applied this approach the value of one normalized as 0 idnt like to be 0. idnt know this code is correct. I want the normalization between 0 and 1

How i can solve this problem?

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Guillaume 2016-8-25

min/max normalisation is rescaling the values in your array so that the minimum value (1 in your case) becomes 0 and the maximum becomes 1.

If you don't like it, then don't do it or do something else (or come up with your own maths: that's math for you, if you subtract 1 from 1, you get 0).

Adam 2016-8-25

If you want 1 to map to something positive then you can just get rid of the min part of the maths and assume the min of your data is 0. But on arbitrary data that will potentially leave a significant portion of your 0-1 output range unused and the data squashed into the rest of it.

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Answer 1

KSSV 2016-8-25

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https://ww2.mathworks.cn/matlabcentral/answers/300832-i-have-problem-in-min-and-max-normalization#answer_232717

在 MATLAB Online 中打开

clc; clear all ;
p=[148 249 357 547 854 1 1184 996 966 679 586 503 281 1 110 89 58 68 28 19 16 6 13 7 4 2 1 12] ;
n = (p-min(p))./(max(p)-min(p)) ;  % normalizing the data p

I have used:

ni = (pi-min(p))/(max(p)-min(p))

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abduall hassn 2016-8-25

Dear Guillaume

Please, can you suggest me and another approach which we can show the normalization value in positive. Thank u

Adam 2016-8-25

What do you want 1 to be? It is easy to come up with a mathematical formula if you know what you want your min and max values to map to and you know you want a linear scaling.

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