Variable kind

src/cfftb1.f

@@ -1,5 +1,6 @@
       SUBROUTINE CFFTB1 (N,C,CH,WA,IFAC)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       CH(*)      ,C(*)       ,WA(*)      ,IFAC(*)
       NF = IFAC(2)
       NA = 0

src/cfftf1.f

@@ -1,5 +1,6 @@
       SUBROUTINE CFFTF1 (N,C,CH,WA,IFAC)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       CH(*)      ,C(*)       ,WA(*)      ,IFAC(*)
       NF = IFAC(2)
       NA = 0

src/cffti1.f

@@ -1,5 +1,6 @@
       SUBROUTINE CFFTI1 (N,WA,IFAC)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       WA(*)      ,IFAC(*)    ,NTRYH(4)
       DATA NTRYH(1),NTRYH(2),NTRYH(3),NTRYH(4)/3,4,2,5/
       NL = N
@@ -27,7 +28,7 @@ SUBROUTINE CFFTI1 (N,WA,IFAC)
       IFAC(1) = N
       IFAC(2) = NF
       TPI =  6.28318530717958647692D0
-      ARGH = TPI/FLOAT(N)
+      ARGH = TPI/REAL(N,RK)
       I = 2
       L1 = 1
       DO 110 K1=1,NF
@@ -43,7 +44,7 @@ SUBROUTINE CFFTI1 (N,WA,IFAC)
             WA(I) = 0.0D0
             LD = LD+L1
             FI = 0.0D0
-            ARGLD = FLOAT(LD)*ARGH
+            ARGLD = REAL(LD,RK)*ARGH
             DO 108 II=4,IDOT,2
                I = I+2
                FI = FI+1.D0

src/cosqb1.f

@@ -1,5 +1,6 @@
       SUBROUTINE COSQB1 (N,X,W,XH)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       X(1)       ,W(1)       ,XH(1)
       NS2 = (N+1)/2
       NP2 = N+2

src/cosqf1.f

@@ -1,5 +1,6 @@
       SUBROUTINE COSQF1 (N,X,W,XH)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       X(1)       ,W(1)       ,XH(1)
       NS2 = (N+1)/2
       NP2 = N+2

src/dcosqb.f

@@ -1,5 +1,6 @@
       SUBROUTINE DCOSQB (N,X,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       X(*)       ,WSAVE(*)
       DATA TSQRT2 /2.82842712474619009760D0/
       IF (N-2) 101,102,103

src/dcosqf.f

@@ -1,5 +1,6 @@
       SUBROUTINE DCOSQF (N,X,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       X(*)       ,WSAVE(*)
       DATA SQRT2 /1.41421356237309504880D0/
       IF (N-2) 102,101,103

src/dcosqi.f

@@ -1,8 +1,9 @@
       SUBROUTINE DCOSQI (N,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       WSAVE(1)
       DATA PIH /1.57079632679489661923D0/
-      DT = PIH/FLOAT(N)
+      DT = PIH/REAL(N,RK)
       FK = 0.0D0
       DO 101 K=1,N
          FK = FK+1.0D0

src/dcost.f

@@ -1,5 +1,6 @@
       SUBROUTINE DCOST (N,X,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       X(*)       ,WSAVE(*)
       NM1 = N-1
       NP1 = N+1

src/dcosti.f

@@ -1,12 +1,13 @@
       SUBROUTINE DCOSTI (N,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       WSAVE(1)
       DATA PI /3.14159265358979323846D0/
       IF (N .LE. 3) RETURN
       NM1 = N-1
       NP1 = N+1
       NS2 = N/2
-      DT = PI/FLOAT(NM1)
+      DT = PI/REAL(NM1,RK)
       FK = 0.0D0
       DO 101 K=2,NS2
          KC = NP1-K

src/dfftb.f

@@ -1,5 +1,6 @@
       SUBROUTINE DFFTB (N,R,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       R(1)       ,WSAVE(1)
       IF (N .EQ. 1) RETURN
       CALL RFFTB1 (N,R,WSAVE,WSAVE(N+1),WSAVE(2*N+1))

src/dfftf.f

@@ -1,5 +1,6 @@
       SUBROUTINE DFFTF (N,R,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       R(1)       ,WSAVE(1)
       IF (N .EQ. 1) RETURN
       CALL RFFTF1 (N,R,WSAVE,WSAVE(N+1),WSAVE(2*N+1))

src/dffti.f

@@ -1,5 +1,6 @@
       SUBROUTINE DFFTI (N,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       WSAVE(1)
       IF (N .EQ. 1) RETURN
       CALL RFFTI1 (N,WSAVE(N+1),WSAVE(2*N+1))

src/dsinqb.f

@@ -1,5 +1,6 @@
       SUBROUTINE DSINQB (N,X,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       X(1)       ,WSAVE(1)
       IF (N .GT. 1) GO TO 101
       X(1) = 4.0D0*X(1)

src/dsinqf.f

@@ -1,5 +1,6 @@
       SUBROUTINE DSINQF (N,X,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       X(1)       ,WSAVE(1)
       IF (N .EQ. 1) RETURN
       NS2 = N/2

src/dsinqi.f

@@ -1,5 +1,6 @@
       SUBROUTINE DSINQI (N,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       WSAVE(1)
       CALL DCOSQI (N,WSAVE)
       RETURN

src/dsint.f

@@ -1,5 +1,6 @@
       SUBROUTINE DSINT (N,X,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       X(1)       ,WSAVE(1)      
       NP1 = N+1
       IW1 = N/2+1

src/dsinti.f

@@ -1,11 +1,12 @@
       SUBROUTINE DSINTI (N,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       WSAVE(1)
       DATA PI /3.14159265358979323846D0/
       IF (N .LE. 1) RETURN
       NS2 = N/2
       NP1 = N+1
-      DT = PI/FLOAT(NP1)
+      DT = PI/REAL(NP1,RK)
       DO 101 K=1,NS2
          WSAVE(K) = 2.0D0*SIN(K*DT)
   101 CONTINUE

src/dzfftb.f

@@ -1,5 +1,6 @@
       SUBROUTINE DZFFTB (N,R,AZERO,A,B,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       R(*)       ,A(*)       ,B(*)       ,WSAVE(*)
       IF (N-2) 101,102,103
   101 R(1) = AZERO

src/dzfftf.f

@@ -1,8 +1,9 @@
       SUBROUTINE DZFFTF (N,R,AZERO,A,B,WSAVE)
+      USE fftpack_kind
 C
 C                       VERSION 3  JUNE 1979
 C
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       R(*)       ,A(*)       ,B(*)       ,WSAVE(*)
       IF (N-2) 101,102,103
   101 AZERO = R(1)
@@ -14,7 +15,7 @@ SUBROUTINE DZFFTF (N,R,AZERO,A,B,WSAVE)
          WSAVE(I) = R(I)
   104 CONTINUE
       CALL DFFTF (N,WSAVE,WSAVE(N+1))
-      CF = 2.0D0/FLOAT(N)
+      CF = 2.0D0/REAL(N,RK)
       CFM = -CF
       AZERO = 0.5D0*CF*WSAVE(1)
       NS2 = (N+1)/2

src/dzffti.f

@@ -1,5 +1,6 @@
       SUBROUTINE DZFFTI (N,WSAVE)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       WSAVE(1)
       IF (N .EQ. 1) RETURN
       CALL EZFFT1 (N,WSAVE(2*N+1),WSAVE(3*N+1))

src/ezfft1.f

@@ -1,5 +1,6 @@
       SUBROUTINE EZFFT1 (N,WA,IFAC)
-      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+      USE fftpack_kind
+      IMPLICIT REAL(RK) (A-H,O-Z)
       DIMENSION       WA(*)      ,IFAC(*)    ,NTRYH(4)
       DATA NTRYH(1),NTRYH(2),NTRYH(3),NTRYH(4)/4,2,3,5/
      1    ,TPI/6.28318530717958647692D0/
@@ -27,7 +28,7 @@ SUBROUTINE EZFFT1 (N,WA,IFAC)
   107 IF (NL .NE. 1) GO TO 104
       IFAC(1) = N
       IFAC(2) = NF
-      ARGH = TPI/FLOAT(N)
+      ARGH = TPI/REAL(N,RK)
       IS = 0
       NFM1 = NF-1
       L1 = 1
@@ -37,7 +38,7 @@ SUBROUTINE EZFFT1 (N,WA,IFAC)
          L2 = L1*IP
          IDO = N/L2
          IPM = IP-1
-         ARG1 = FLOAT(L1)*ARGH
+         ARG1 = REAL(L1,RK)*ARGH
          CH1 = 1.0D0
          SH1 = 0.0D0
          DCH1 = COS(ARG1)