diff — Difference between matrix elements
diff calculates the difference between elements of the matrix
argument. If the matrix is a vector, then diff returns a vector
of the differences between adjacent elements. The return vector has one
less element than the argument. If the argument is not a vector, then
differences are calulated down each column, returning a matrix with one
less row than the argument.
If the optional scalar argument is present, it specifies the number
of times differences are taken. For example, if it is 2, then the
differences between the differences are returned.
This is not an built-in function. This function
is normally loaded on start-up from the diff.r file in the
standard rlib directory. Use of the -r option, incorrectly
setting the RLAB_LIB_DIR environmental variable, or modifying
diff.r may make this function unavailable.
Subsections