arrayIndex
From R.utils v1.6.2
by Henrik Bengtsson
Converts vector indices to array indices
Converts vector indices to array indices assuming last array dimension to "move fastest", e.g. matrices are stored column by column.
Usage
## S3 method for class 'default':
arrayIndex(i, dim, ...)
Arguments
Value
References
[1] H. Bengtsson, Bayesian Networks - a self-contained introduction with implementation remarks, Master's Thesis in Computer Science, Mathematical Statistics, Lund Institute of Technology, 1999.
See Also
From R v2.11.0 there is arrayInd
(), which does
the same thing as this method.
which
() with argument arr.ind=TRUE
.
Examples
# Single index
print(arrayIndex(21, dim=c(4,3,3)))
# Multiple indices
print(arrayIndex(20:23, dim=c(4,3,3)))
# Whole array
x <- array(1:30, dim=c(5,6))
print(arrayIndex(1:length(x), dim=dim(x)))
# Find (row,column) of maximum value
m <- diag(4-abs(-4:4))
print(arrayIndex(which.max(m), dim=dim(m)))
Community examples
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