Name

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      LGRADIENT

Purpose

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      Create a floating array with a linear gradient.

Category

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Calling Sequence

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      g = lgradient( nx, ny, ang, dst)

Inputs

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      nx, ny = array size in pixels. in
      ang = angle of gradient (deg CCW from x axis). in
      dst = distance where gradient equals +/-1. in

Keyword Parameters

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Outputs

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      g = Returned floating array with gradient. out

Common Blocks

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Notes

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      Notes: returned array is 0 at center and increases
      to 1 at distance dst in direction ang, -1 at same
      distance in opposite direction. Intended for detrending:
      new = old*(1+g) or new = old*(1+g*weight)

Modification History

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      R. Sterner, 1999 Nov 3
  Copyright (C) 1999, Johns Hopkins University/Applied Physics Laboratory
  This software may be used, copied, or redistributed as long as it is not
  sold and this copyright notice is reproduced on each copy made. This
  routine is provided as is without any express or implied warranties
  whatsoever. Other limitations apply as described in the file disclaimer.txt.