Programmer Guide/Command Reference/EVAL/sum: Difference between revisions
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Revision as of 18:31, 18 November 2010
sum
Calculate the summation over one or more user-defined extents of a vector x. The result of the following functions is a vector or a scalar (depending on the number of extents).
The summation of n extents of x. The first extent begins with the index us and the last extent ends with the index os.
Usage:
sum(x, us, os, n)
Result:
If n > 1 the result is a vector, otherwise it is a scalar.
The summation over the extent nrow(uv). Every pair (uv[i], ov[i]) defines an index extent to sum.
Usage:
sum(x, uv, ov)
The summation over the extent nrow(rv)-1. Every pair (rv[i], rv[i+1]) defines an index extent to sum.
Usage:
sum(x, rv)
The summation over the extent nrow(rm). Every pair (rm[i,0], rv[i,1] defines an index extent for summation.
Usage:
sum(x, rm)
