how to extract data with some condition

Hello everyone

I have a 9 colomns of data,say x1 to x9, each colomn has 150 rows

I need to extract all the data when x2==0 and x1=0.5, and make a new dataset of 9 colomns

Please teach me how to do this

I will appreciate you help

[madhan ravi]

so when it satisfies the condition you mean you want to extract all the correponding rows/columns?upload the sample data and give an example of your desired output.

[Samaneh Arzpeima]

That is right

for example when the 4th and 5th rows of x2 are 0 and x1 are 0.5

i should extract 4th and 5th rows of all 9 colomns and make a new data set

thank you

[madhan ravi]

just give a numerical example still not clear

Answer 1

[Mark Sherstan]

Try the code below. You will have to change it to your data but you should get the idea.

% Generate a random matrix of intergers between 1 and 3
x = randi(3,[250 9]);

% Find where there are 1's in column one and 3's in column two for each row
row = find( x(:,1)==2 & x(:,2)==3 );

% Build a new matrix A that satisfies the condition of 1's and 3's
A = x(row,:)

[Samaneh Arzpeima]

thank you very much