## VRfShift

#### Routine

void VRfShift (float x[], int Nkeep, int Nshift)

#### Purpose

Shift the elements of an array of floats

#### Description

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

#### Parameters

<-> 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

P. Kabal / Revision 1.11 2003/05/09

#### See Also

VRfCopy

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