MATLAB: Taking a few columns out of a big array and making a new smaller one

arraydataMATLABmatrix manipulation

I have a data array with 24 columns and a 10k+ rows of data. I want to take 4 of the columns (column 2,4,8,and a constant value of "1900") and make a new array for calculations. How do I do this?

Best Answer

Try this:

smallArray = bigArray(:, [2,4,8]); % Extract columns 2, 4, 8.

Actually, I'm not sure what the "and a constant value of "1900"" means for your array of 24 columns. If you want to tack on a column of all values of 1900, do this

smallArray = [smallArray, 1900*ones(size(smallArray, 1), 1)];

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box1=cut2d(:,2:4);
box2=rombohedral(:,1:3);
[index1,index2] = ismember(box1,box2,'rows');
% index2 holds the indices of the rows that are also in box1
rombohedral2d=rombohedral(index2,:); % I assume you want all the columns, not only 3, right?
% if you want only those 3 columns, use:
% rombohedral2d=rombohedral(index2,1:3);

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yMax - yMin

will always be 1 smaller than

yMin:yMax

because of the inclusive end points (assuming integers, of course, which we are here since they are indices).

e.g.

10 - 1 = 9

but

1:10

clearly gives an array of length 10.

You probably just need to put some +1's in your X, Y and Z

Best Answer

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