How to prepare normalized feature matrix in MATLAB ?

Question

charu shree 2023-3-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1930205-how-to-prepare-normalized-feature-matrix-in-matlab

评论： charu shree 2023-3-17

采纳的回答： Dyuman Joshi

Hello all, I am having a feature matrix say

of dimension 500 by 4. I want to normalize this feature matrix

and obtain normalized feature matrix

such that

element of

is obtained as

----(1)

where

indicates

element of feature matrix

.

My query is how can we obtain normalized feature matrix

from equation (1).

Any help in this regard will be highly appreciated.

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charu shree 2023-3-17

编辑：charu shree 2023-3-17

I tried with 'for loop' and getting the proper answer. Here are my efforts:

for i = 1:500

for j = 1:4

p1 = min(D(i,:));

p2 = max(D(i,:));

d_ij = D(i,j);

deno = p2-p1;

numer = d_ij-p1;

P(i,j) = numer/deno;

end

Is there any other way so that I can avoid 'for loop' ?

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Answer 1

Dyuman Joshi 2023-3-17

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1930205-how-to-prepare-normalized-feature-matrix-in-matlab#answer_1194870

在 MATLAB Online 中打开

%Random data
D = rand(500,4);
%minimum of each row
minval=min(D,[],2);
%maximum of each row
maxval=max(D,[],2);
%Vector approach
P1=(D-minval)./(maxval-minval);
P2=zeros(size(D));
for i = 1:500
    for j = 1:4
        p1 = min(D(i,:));
        p2 = max(D(i,:));
        d_ij = D(i,j);
        deno = p2-p1;
        numer = d_ij-p1;
        P2(i,j) = numer/deno;        
    end
end
%Checking if the outputs are equal or not
isequal(P1,P2)
ans = logical
   1