# subsetting a matrix/array in R

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From the R-devel svn log. Nice addition…

r50896 | falcon | 2010-01-05 12:05:31 -0800 (Tue, 05 Jan 2010) | 7 lines

Changed paths:

M /trunk/NEWS

M /trunk/src/include/Defn.h

M /trunk/src/library/base/man/Extract.Rd

M /trunk/src/main/subassign.c

M /trunk/src/main/subscript.c

M /trunk/src/main/subset.c

M /trunk/tests/Makefile.common

A /trunk/tests/array-subset.RAllow n-dim arrays to be subsetted by an n-column character matrix

The character matrix is converted to the corresponding integer matrix

by matching against the dimnames of the array. NA values in any row

of the character matrix are propagated to the result. Unmatched

values result in a subscript out of bounds error. Empty string “” is

not allowed to match and therefore always results in an error.

I wonder about an option controlling the behavior of non-matches?

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