How to make an if/else statement

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Sandy
Sandy 2013-7-5
My data file consists of 3 columns and 100,000 rows. I want my code to go down a series of rows and test each row for the following.
if column1 > 13 & column1 < 15
put all those rows in a matrix (including columns 2 & 3)
elseif column1 > 2 & column1 < 4
put all these rows in a different matrix (including columns 2 & 3)
end
What's a good approach to this?

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采纳的回答

Guru
Guru 2013-7-5
FIND with the conditions is actually the way to do this.
% First read in your data file into MATLAB, let's say variable A
I1 = find(A(:,1) > 13 & A(:,1)<15);
I2 = find(A(:,1) > 2 & A(:,1) < 4);
% Now that you know the rows you want to assign, simply assign them...
B = A(I1,:);
C = A(I2,:);
HTH

更多回答（1 个）

Kelly Kearney
Kelly Kearney 2013-7-5
No if/else needed... just some logical indexing:
a = rand(100000,3)*15;
b = a(a(:,1)>13 & a(:,1)<15,:);
c = a(a(:,1)>2 & a(:,1)<4,:);

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