What is the mistake, please help

2 次查看（过去 30 天）
Selin Soguksu
Selin Soguksu 2012-12-12
Hello, I have a 10000-10 matrix called orj_matr. I want to randomly select 50 rows from this matrix. But I want this 50 times. So I'll have 50 different 50-10 matrix. For these purpose I used the codes like this:
for x=1:50
Nrows=size(orj_matr,1)
new_matr=randperm(Nrows)
new_matr=new_matr(1:50)
new[x]=orj_matr(new_matr,:)
end
But it doesn't work properly. What is the mistake? Please help me.

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采纳的回答

Mark Whirdy
Mark Whirdy 2012-12-12
编辑：Mark Whirdy 2012-12-12
Is the square-bracket in new[x] pseudo-code?
orj_matr = rand(10000,10);
a = NaN(50,10,50);
for i = 1:50
index = randperm(10000);
index = index(1:50)';
a(:,:,i) = orj_matr(index,:);
end

更多回答（1 个）

Walter Roberson
Walter Roberson 2012-12-12
You have the line
new[x]=orj_matr(new_matr,:)
In MATLAB, [] is never used for indexing. Try
new{x} = orj_matr(new_matr,:);
  2 个评论
Selin Soguksu
Selin Soguksu 2012-12-12
When I use like this
new{x} = orj_matr(new_matr,:);
An error message comes "* Cell contents assignment to a non-cell array object*"
Matt J
Matt J 2012-12-12
Only because "new" has a prior definition floating around

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