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PDP-10 Archives
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decus_20tap4_198111
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decus/20-0112/index.for
There is 1 other file named index.for in the archive. Click here to see a list.
FUNCTION QFADD(X,Y,IX,IY)
DOUBLE PRECISION QFADD,X,Y,FEXPC,DTEN(-3/3),FIEXP,XX,YY,DABS
COMMON/CIEXP/IEXP,FEXPC
DATA DTEN/0.0D0,1.0D-24,1.0D-12,1.0D0,1.0D12,1.0D24,1.0D36/
XX=FIEXP(X)
IXX=IX+IEXP
IS=-IEXP
YY=FIEXP(Y)
IYY=IY+IEXP
IF(DABS(XX)-1.0D0)11,12,12
11 IXX=IXX-12
XX=XX*1.0D12
IS=IS+12
12 I=(IXX-IYY)/12
IF(I)25,10,15
10 QFADD=FIEXP(XX+YY)
ISS=IEXP
IEXP=IXX+IEXP
FEXPC=DTEN((IS-ISS)/12)
GO TO 35
15 IF(I-2)16,17,18
16 QFADD=FIEXP(XX+YY*DTEN(-I))
ISS=IEXP
IEXP=IXX+IEXP
FEXPC=DTEN((IS-ISS)/12)
GO TO 35
17 IF(DABS(YY)-1.0D0)18,18,16
18 QFADD=XX
IEXP=IXX
FEXPC=DTEN(IS/12)
GO TO 35
25 IF(I+3)28,27,16
27 IF(DABS(YY)-1.0D0)16,28,28
28 QFADD=YY
IEXP=IYY
FEXPC=0.0D0
35 RETURN
END
FUNCTION QFSQRT(X,I)
DOUBLE PRECISION QFSQRT,DSQRT,X,FIEXP,FEXPC,XX
COMMON/CIEXP/IEXP,FEXPC
XX=FIEXP(X)
IXX=(I+IEXP)/12
II=IXX/2
IF(IXX-2*II)11,15,10
10 QFSQRT=DSQRT(XX*1.0D12)
GO TO 20
11 QFSQRT=DSQRT(XX*1.0D-12)
GO TO 20
15 QFSQRT=DSQRT(XX)
20 IEXP=II*12
RETURN
END
FUNCTION QCUBRT(X,I)
IMPLICIT DOUBLE PRECISION (A-H,O-R,T-Z)
COMMON/CIEXP/IEXP,FEXPC
DIMENSION DTEN3(-2/2)
DATA DTEN3/1.0D-8,1.0D-4,1.0D0,1.0D4,1.0D8/
XX=X
II=I/12
I3=3*(II/3)
IF(XX)15,10,15
10 QCUBRT=0.0D0
IEXP=0
GO TO 20
15 QCUBRT=DSIGN(DEXP(DLOG(DABS(XX))/3.0D0),XX)
QCUBRT=FIEXP(QCUBRT*DTEN3(II-I3))
IEXP=IEXP+I3*12
20 RETURN
END
FUNCTION QATANB(Y,X,IY,IX)
IMPLICIT DOUBLE PRECISION (A-H,O-R,T-Z)
COMMON/CIEXP/IEXP,FEXPC
REAL FLOAT,ALOG10,ABS
PI=3.14159265358979324D0
IF(X)4,15,4
4 IF(Y)10,5,10
5 IF(X)7,12,12
7 QATANB=PI
GO TO 30
10 XX=FIEXP(X)
IXX=IEXP+IX
YY=FIEXP(Y)
IYY=IEXP+IY
R=YY/DABS(XX)
IYX=IYY-IXX
ST=ALOG10(ABS(SNGL(R)))+FLOAT(IYX)
IF(ST+20.0E0)11,11,14
11 IF(XX)13,12,12
12 QATANB=0.0D0
GO TO 30
13 QATANB=DSIGN(PI,Y)
GO TO 30
14 IF(ST-20.0E0)16,15,15
15 QATANB=DSIGN(PI/2.0D0,Y)
GO TO 30
16 QATANB=QATAN2(QFLOAT(R,IYX),DSIGN(1.0D0,XX))
30 RETURN
END
FUNCTION QATAN2(Y,X)
DOUBLE PRECISION QATAN2,Y,X,QATAN,DABS,PI,PI2,R
PI=3.14159265358979324D0
IF(DABS(Y)-DABS(X))10,10,15
10 R=Y/X
IF(X)22,20,20
20 QATAN2=QATAN(R)
GO TO 30
22 IF(Y)23,24,24
23 QATAN2=QATAN(R)-PI
GO TO 30
24 QATAN2=PI+QATAN(R)
GO TO 30
15 R=X/Y
PI2=PI/2.0D0
IF(Y)27,25,25
25 QATAN2=PI2-QATAN(R)
GO TO 30
27 QATAN2=-PI2-QATAN(R)
30 RETURN
END
DOUBLE PRECISION FUNCTION QATAN(X)
DOUBLE PRECISION X,PI,DATAN,DSQRT,Z,DS2,A
Z=X
PI=3.14159265358979324D0
IF(X)2,1,3
1 QATAN=0
RETURN
2 M1=-1
X=-X
GO TO 4
3 M1=1
4 IF(X-1.D0)6,6,5
5 M2=-1
X=1.D0/X
GO TO 7
6 M2=1
7 DS2=DSQRT(2.0D0)
A=-1.0D0+DS2
IF(X-A)9,9,8
8 M3=-1
X=(1.D0-X)/(1.D0+X)
GO TO 10
9 M3=1
10 IF(X+((1.0D0+DS2)*(1.0D0-DSQRT(4.0D0-2.0D0*DS2))))12,12,11
11 M4=-1
X=(A-X)/(1.0D0+A*X)
GO TO 13
12 M4=1
13 QATAN=DATAN(X)
IF(M4.LT.0)QATAN=(PI/8.D0)-QATAN
IF(M3.LT.0)QATAN=(PI/4.D0)-QATAN
IF(M2.LT.0)QATAN=(PI/2.D0)-QATAN
IF(M1.LT.0)QATAN=-QATAN
X=Z
RETURN
END
FUNCTION QEXP(X)
IMPLICIT DOUBLE PRECISION (A-H,O-R,T-Z)
REAL FLOAT
COMMON/CIEXP/IEXP,FEXPC
A=27.6310211159285482D0
XX=DABS(X)
IX=IDINT(XX/A)
IEXP=12*IX
XX=XX-DBLE(FLOAT(IX))*A
IF(X)20,15,10
15 QEXP=1.0D0
GO TO 25
20 XX=-XX
IEXP=-IEXP
10 QEXP=DEXP(XX)
25 RETURN
END
FUNCTION FIEXP(X)
DOUBLE PRECISION FIEXP,X,FEXPC,DABS,XX
COMMON/CIEXP/IEXP,FEXPC
XX=DABS(X)
IF(XX-1.0D12)20,10,10
10 IF(XX-1.0D24)16,15,15
15 IEXP=24
FIEXP=X*1.0D-24
FEXPC=1.0D-24
GO TO 25
16 IEXP=12
FIEXP=X*1.0D-12
FEXPC=1.0D-12
GO TO 25
20 IF(XX-1.0D-12)22,22,21
21 IEXP=0
FIEXP=X
FEXPC=1.0D0
GO TO 25
22 IF(XX-1.0D-24)24,24,23
23 IEXP=-12
FIEXP=X*1.0D+12
FEXPC=1.0D+12
GO TO 25
24 IEXP=-24
FIEXP=X*1.0D+24
FEXPC=1.0D+24
25 RETURN
END
FUNCTION QFLOAT(X,I)
DOUBLE PRECISION X,QFLOAT,DTEN(-1/1),XX
DATA DTEN/1.0D-12,1.0D0,1.0D12/
II=I/12
XX=X
15 IF(II-2)10,11,12
12 XX=XX*1.0D24
II=II-2
GO TO 15
11 QFLOAT=XX*1.0D24
GO TO 35
10 IF(II+2)13,14,16
13 XX=XX*1.0D-24
II=II+2
GO TO 10
14 QFLOAT=XX*1.0D-24
GO TO 35
16 QFLOAT=XX*DTEN(II)
35 RETURN
END