void VRfShift (float x, int Nkeep, int Nshift)
Shift the elements of an array of floats
This routine shifts elements of a float array. If the number of elements to
be retained is zero, no action is taken. For a shift down (Nshift positive),
the elements of the array are shifted down to the bottom of the array. The
input array must have at least Nkeep + Nshift elements.
x[i+Nshift] --> x[i], for i from 0 to Nkeep-1
For a shift up (Nshift negative), the elements of the array are shifted up to
the top of the array. The input array must have at least Nkeep - Nshift
elements (Nshift being negative).
x[i] --> x[i-Nshift], for i from Nkeep-1 to 0
<-> float x
Array of floats (Nkeep + |Nshift| elements)
-> int Nkeep
Number of elements to be retained
-> int Nshift
Number of positions to be shifted. Nshift is positive for a shift down
and negative for a shift up.
Author / revision
/ Revision 1.11 2003/05/09
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