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54 lines
1.7 KiB
54 lines
1.7 KiB
2 years ago
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C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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C=======================================================================
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SUBROUTINE INIGRD (FROM, TO, GRAD, NINT, NPTS, ARRAY)
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C=======================================================================
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C INIGRD: Initialize array ARRAY with NPTS values.
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C values are calculated to have a gradient of GRAD
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C ranging from FROM to TO with NINT segments.
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C --- FROM - IN - Minimum value of range
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C --- TO - IN - Maximum value of range
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C --- GRAD - IN - Gradient
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C --- NINT - IN - Number of intervals in range
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C --- NPTS - IN - Number of points in range. Can be less than NINT if
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C do not need full range, but want gradient spacing
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C based on full range. Normally NPTS = NINT + 1
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C --- ARRAY- OUT- Range of values
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REAL ARRAY(NPTS)
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LOGICAL NOGRAD
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IF (FROM .EQ. TO .OR. NINT .LE. 0) THEN
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CALL PRTERR ('PROGRAM',
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* 'invalid values passed to INIGRD')
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RETURN
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END IF
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NOGRAD = (ABS(GRAD - 1.0)/NINT .LE. 1.0e-7)
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IF (NOGRAD) THEN
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D3 = 1.0 / NINT
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DO 10 I=1, NPTS
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ARRAY(I) = D3 * (I-1)
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10 CONTINUE
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ELSE
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ARRAY(1) = 0.0
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D3 = (1.0 - GRAD) / (1.0 - GRAD**NINT)
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DO 20 I=2,NPTS
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ARRAY(I) = ARRAY(I-1) + D3 * GRAD**(I-2)
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20 CONTINUE
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END IF
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DO 30 I=1, NPTS
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ARRAY(I) = FROM + ARRAY(I) * (TO - FROM)
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30 CONTINUE
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RETURN
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END
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