如何在MATLAB中随机分离数据

Question

suppose we have an array storing data,

data=[1 2 3 4 5 6 7 8 9 10;
      10 9 8 7 6 5 4 3 2 1];

Then I want to randomly split the data into two array, one contains 3 columns of the data and the other 7, what I think of is to use randperm function,

index = randperm(10,3);

then

data1 = data(:,index);

my question is how to represent the other data set which contains the other remaining 7 column of the original data set? Thanks.

Answer 1

You could do this:

index = randperm(10);
data1 = data(:,index(1:3));
data2 = data(:,index(4:10));

Answer 2

An alternate solution that may feel more intuitive depending on the situation.

index = randperm(10,3);
data1 = data(:,index);
data(:,index) = [];

Note that this is especially appealing when you try to draw a few values from a huge (sparse) matrix.