randomly divide a matrix
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baran
el 21 de Mayo de 2017
Comentada: Star Strider
el 6 de Jun. de 2021
hi, i have a 16435*25 matrix that name is input, i want to randomly divided it in 2 parts: one for train and another for validate data, that 70% of its rows randomly selected as train matrix (i.e 11504*25 matrix) and 30% of its rows randomly selected as validate matrix (i.e 4930*25), how can i do this? thanks a lot
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Respuesta aceptada
Star Strider
el 21 de Mayo de 2017
For your matrix:
row_idx = randperm(16435, 11504)';
To illustrate:
example = randperm(10, 7)'
example =
5
8
2
4
7
3
10
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MathReallyWorks
el 21 de Mayo de 2017
Editada: MathReallyWorks
el 21 de Mayo de 2017
Hello Dear,
Use this code. I've generated a random matrix of the same order that you want. I have randomized all the rows of matrix and then I'm selecting first 11504 rows for training and rest for validation. I hope it will be helpful.
orderedArray = rand(16435,25); % Random Data %You can use your data here
shuffledArray = orderedArray(randperm(size(orderedArray,1)),:); %Randomizing the rows of matrix
t=zeros(11504,25); % Size of Train Data
v=zeros(4930,25); % Size of Validate Data
for i=1:11504
t(i,:) = shuffledArray(i,:);
end
j=1;
for i=11541:16435
v(j,:) = shuffledArray(i,:);
j=j+1;
end
Type whos t and whos v on command window, you will get to know the dimensions of train and validate data matrices.
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