MATLAB: Split a vector into 2 vectors randomly

MATLABrandomvectors

i have a vector of 4 columns and 150 rows named "samples". I want to put randomly the 120 rows in a new vector, and the remaining rows in a second new vector. I am new to matlab. can anyone help me? thanks in advance.

Best Answer

I think you will find the function randperm useful. You can use it to generate a random order for your 150 rows and then select the first 30 for your smaller set and the last 120 for the larger set (order not important).

For example

my_indices = randperm(150);
small_set = data(my_indices(1:30),:);
large_set = data(my_indices(31:end),:);

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MATLAB: How to get data some data from one vector and save it in another vector

The file ( Data_f_b.mat) you have attached has two 500x2 vectors data_b and data_f. To copy the elements from row index 1 to 100 of the first vector data_f into another vector:

thirdVector=data_f(1:100,:);

For extracting the required elements from second vector data_b:

 % store the values of data_b vector from row index 120 into an array 
 temp=data_b(120:end,:);
 % element wise logical AND of the two columns of the array,to find the row having first zero element
 i=find( ~(temp(:,1) & temp(:,2)) , 1);
 % append the values extracted from row index 120 of data_b till the row having first zero element  
 thirdVector=[ thirdVector; temp(1:i,:)];

for more information about find function and performing logical operations on arrays/vectors, you can refer the documentation .

MATLAB: Repeated row within a matrix

 n=randi(100,1)
x=rand(n,10)' % your n vector;
m=ones(1,10) % your special vector
y=repmat(m,n,1)'
res=[x;y];
result=reshape(res(:),10,2*n)'

Best Answer

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MATLAB: How to get data some data from one vector and save it in another vector

MATLAB: Repeated row within a matrix

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