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41 lines
1 KiB
FortranFixed
41 lines
1 KiB
FortranFixed
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*DECK INDXB
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SUBROUTINE INDXB (I, IR, IDX, IDP)
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C***BEGIN PROLOGUE INDXB
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C***SUBSIDIARY
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C***PURPOSE Subsidiary to BLKTRI
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C***LIBRARY SLATEC
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C***TYPE INTEGER (INDXB-I)
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C***AUTHOR (UNKNOWN)
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C***SEE ALSO BLKTRI
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C***ROUTINES CALLED (NONE)
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C***COMMON BLOCKS CBLKT
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C***REVISION HISTORY (YYMMDD)
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C 801001 DATE WRITTEN
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C 891214 Prologue converted to Version 4.0 format. (BAB)
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C 900402 Added TYPE section. (WRB)
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C 920422 Added statement so IDX would always be defined. (WRB)
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C***END PROLOGUE INDXB
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C
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COMMON /CBLKT/ NPP ,K ,EPS ,CNV ,
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1 NM ,NCMPLX ,IK
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C***FIRST EXECUTABLE STATEMENT INDXB
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IDX = I
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IDP = 0
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IF (IR) 107,101,103
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101 IF (I-NM) 102,102,107
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102 IDX = I
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IDP = 1
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RETURN
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103 IZH = 2**IR
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ID = I-IZH-IZH
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IDX = ID+ID+(IR-1)*IK+IR+(IK-I)/IZH+4
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IPL = IZH-1
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IDP = IZH+IZH-1
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IF (I-IPL-NM) 105,105,104
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104 IDP = 0
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RETURN
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105 IF (I+IPL-NM) 107,107,106
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106 IDP = NM+IPL-I+1
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107 RETURN
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END
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