how to extract data with some condition

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Samaneh Arzpeima 2018-11-30

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评论： Samaneh Arzpeima 2018-11-30

采纳的回答： Mark Sherstan

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

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Samaneh Arzpeima 2018-11-30

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 2018-11-30

just give a numerical example still not clear

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Mark Sherstan 2018-11-30

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在 MATLAB Online 中打开

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,:)