R applying a function to a sub-matrix

Asked Jun 28 '13 at 05:21

Active Jun 28 '13 at 05:32

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I have a large matrix roughly 90x100x90x200 The first 3 dimensions are spatial and the last is time. To apply a mask to my data, I wish to multiply the first 3 dimensions by the mask of the same dimensions for all 200 time points. Is there an _apply function that can be used to do this? Thanks for any suggestions.

-D

asked Jun 28 '13 at 05:21

user2530563

4

maybe `sweep(Array,4,mask,"*")` ? (Not entirely sure what you mean by "mask") – Ben Bolker Jun 28 '13 at 05:32
Objects of more than 2 dimensions are not called 'matrices' in R. – IRTFM Jun 28 '13 at 06:43
I'm asumming the mask is an array of 0/1 or 1/NA, but you should confirm. If so, the answer is what @Ben proposed. – Ricardo Oliveros-Ramos Jun 28 '13 at 07:17
@agstudy, why did you delete your answer? Even if `sweep()` is a more precise answer, yours (with `apply`) still works ... – Ben Bolker Jun 28 '13 at 17:43

R applying a function to a sub-matrix

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