How can I perform matrix operations on certain rows?

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I have data stored in a large matrix (8 columns of hundreds of thousands of rows), for example:
Year D Val
1980 1 345
1980 2 320
1980 3 364
1981 1 400
1981 2 387
1981 3 209
1982 1 195
1982 2 358
1982 3 322
How can I plot/ save/ perform operations on the rows for certain years?
Many thanks.

Answers (1)

zepp
zepp on 30 Mar 2017
What do you mean by 'certain'? Is there any condition that determines the selection of years. Then, you could use a logical array of length (nrows) and then select the years based on this logical array.

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