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

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Bennett Torrance
Bennett Torrance 2017-2-3
评论： Image Analyst 2017-2-3
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?

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Image Analyst
Image Analyst 2017-2-3
编辑：Image Analyst 2017-2-3
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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Bennett Torrance
Bennett Torrance 2017-2-3
How would I make it so the 1900 column is the first column instead of the last one?

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