PLOT6 Subroutine

public subroutine PLOT6(Y, X, N, Ymin, Ymax, Xmin, Xmax)

NAME

plot6(3f) - [M_datapac:GENERIC_LINE_PLOT] generate a line printer plot

SYNOPSIS

   SUBROUTINE PLOT6(Y,X,N,Ymin,Ymax,Xmin,Xmax)

DESCRIPTION

PLOT6(3f) yields a one-page printer plot of Y(i) versus X(i):

  1. with the vertical (Y) axis min and max
     and the horizontal (X) axis min and max
     values specified by the data analyst.

the use of the YMIN, YMAX, XMIN, and XMAX specifications allows the
data analyst to control fully the plot axis limits, so as, for example,
to zero-in on an interesting sub-region of a previous plot.

INPUT ARGUMENTS

Y      the vector of (unsorted or sorted) observations to be plotted
       vertically.

X      the vector of (unsorted or sorted) observations to be plotted
       horizontally.

N      the integer number of observations in the vector y. there is
       no restriction on the maximum value of n for this subroutine.

YMIN   the value of desired minimum for the vertical axis.
YMAX   the value of desired maximum for the vertical axis.
XMIN   the value of desired minimum for the horizontal axis.
XMAX   the value of desired maximum for the horizontal axis.

OUTPUT

A one-page printer plot of y(i) versus x(i), with specified axis limits.

EXAMPLES

Sample program:

program demo_plot6
use M_datapac, only : plot6
implicit none
! call plot6(x,y)
end program demo_plot6

Results:

AUTHOR

The original DATAPAC library was written by James Filliben of the
Statistical Engineering Division, National Institute of Standards
and Technology.

MAINTAINER

John Urban, 2022.05.31

LICENSE

CC0-1.0

Arguments

Type IntentOptional Attributes Name
real(kind=wp), dimension(:) :: Y
real(kind=wp), dimension(:) :: X
integer :: N
real(kind=wp) :: Ymin
real(kind=wp) :: Ymax
real(kind=wp) :: Xmin
real(kind=wp) :: Xmax

Common Blocks

HIST (subroutine)
PLOT10 (subroutine)
PLOT7 (subroutine)
PLOT8 (subroutine)
PLOT9 (subroutine)
PLOTC (subroutine)
PLOTCO (subroutine)
PLOT (subroutine)
PLOTSC (subroutine)
PLOTS (subroutine)
PLOTSP (subroutine)
PLOTU (subroutine)
PLOTX (subroutine)
PLOTXX (subroutine)
HIST (subroutine)
PLOT10 (subroutine)
PLOT6 (subroutine)
PLOT7 (subroutine)
PLOT8 (subroutine)
PLOT9 (subroutine)
PLOTC (subroutine)
PLOTCO (subroutine)
PLOT (subroutine)
PLOTSC (subroutine)
PLOTS (subroutine)
PLOTSP (subroutine)
PLOTU (subroutine)
PLOTX (subroutine)
PLOTXX (subroutine)
"> common /BLOCK1/

Type Attributes Name Initial
integer :: IGRaph(55,130)

Source Code

SUBROUTINE PLOT6(Y,X,N,Ymin,Ymax,Xmin,Xmax)
IMPLICIT NONE
REAL(kind=wp) :: aim1 , cutoff , hold , ratiox , ratioy , X , x25 , x75 , Xmax , xmid , Xmin , Y , ylable , Ymax , Ymin
INTEGER i , iflag , ip2 , j , k , mx , my , N , n2
!
!     COMMENT--VALUES IN THE VERTICAL AXIS VECTOR (Y)
!              WHICH ARE SMALLER THAN YMIN OR LARGER THAN YMAX,
!              OR VALUES IN THE HORIZONTAL AXIS VECTOR (X)
!              WHICH ARE SMALLER THAN XMIN OR LARGER THAN XMAX
!              WILL NOT BE PLOTTED.
!            --VALUES IN THE VERTICAL AXIS VECTOR (Y)
!              OR THE HORIZONTAL AXIS VECTOR (X) WHICH ARE
!              EQUAL TO OR IN EXCESS OF 10.0**10 WILL NOT BE
!              PLOTTED.
!              THIS CONVENTION GREATLY SIMPLIFIES THE PROBLEM
!              OF PLOTTING WHEN SOME ELEMENTS IN THE VECTOR Y
!              (OR X) ARE 'MISSING DATA', OR WHEN WE PURPOSELY
!              WANT TO IGNORE CERTAIN ELEMENTS IN THE VECTOR Y
!              (OR X) FOR PLOTTING PURPOSES (THAT IS, WE DO NOT
!              WANT CERTAIN ELEMENTS IN Y (OR X) TO BE PLOTTED).
!              TO CAUSE SPECIFIC ELEMENTS IN Y (OR X) TO BE
!              IGNORED, WE REPLACE THE ELEMENTS BEFOREHAND
!              (BY, FOR EXAMPLE, USE OF THE   REPLAC   SUBROUTINE)
!              BY SOME LARGE VALUE (LIKE, SAY, 10.0**10) AND
!              THEY WILL SUBSEQUENTLY BE IGNORED IN THE PLOT
!              SUBROUTINE.
!
!---------------------------------------------------------------------
!
CHARACTER(len=4) :: IGRaph
CHARACTER(len=4) :: sbnam1 , sbnam2
CHARACTER(len=4) :: alph11 , alph12 , alph21 , alph22 , alph31 , alph32
CHARACTER(len=4) :: blank , hyphen , alphai , alphax
CHARACTER(len=4) :: alpham , alphaa , alphad , alphan , equal
!
      DIMENSION Y(:)
      DIMENSION X(:)
      DIMENSION ylable(11)
      COMMON /BLOCK1/ IGRaph(55,130)
!
      DATA sbnam1 , sbnam2/'PLOT' , '6   '/
      DATA alph11 , alph12/'FIRS' , 'T   '/
      DATA alph21 , alph22/'SECO' , 'ND  '/
      DATA alph31 , alph32/'THIR' , 'D   '/
      DATA blank , hyphen , alphai , alphax/' ' , '-' , 'I' , 'X'/
      DATA alpham , alphaa , alphad , alphan , equal/'M' , 'A' , 'D' ,  &
     &     'N' , '='/
!
      cutoff = (10.0_wp**10) - 1000.0_wp
!
!     CHECK THE INPUT ARGUMENTS FOR ERRORS
!
      WRITE (G_IO,99001)
99001 FORMAT ('1')
      IF ( N<1 ) THEN
         WRITE (G_IO,99011)
         WRITE (G_IO,99012)
         WRITE (G_IO,99013) alph31 , alph32 , sbnam1 , sbnam2
         WRITE (G_IO,99002) N
99002    FORMAT (' ','IS NON-NEGATIVE (WITH VALUE = ',I0,')')
         WRITE (G_IO,99011)
         RETURN
      ELSE
         IF ( N==1 ) THEN
            WRITE (G_IO,99011)
            WRITE (G_IO,99012)
            WRITE (G_IO,99013) alph31 , alph32 , sbnam1 , sbnam2
            WRITE (G_IO,99003) N
99003       FORMAT (' ','HAS THE VALUE 1')
            WRITE (G_IO,99011)
            RETURN
         ELSE
!
            hold = Y(1)
            DO i = 2 , N
               IF ( Y(i)/=hold ) GOTO 50
            ENDDO
            WRITE (G_IO,99011)
            WRITE (G_IO,99012)
            WRITE (G_IO,99013) alph11 , alph12 , sbnam1 , sbnam2
            WRITE (G_IO,99014) hold
            WRITE (G_IO,99011)
            RETURN
         ENDIF
 50      hold = X(1)
         DO i = 2 , N
            IF ( X(i)/=hold ) GOTO 100
         ENDDO
         WRITE (G_IO,99011)
         WRITE (G_IO,99012)
         WRITE (G_IO,99013) alph21 , alph22 , sbnam1 , sbnam2
         WRITE (G_IO,99014) hold
         WRITE (G_IO,99011)
         RETURN
      ENDIF
!
 100  DO i = 1 , N
         IF ( Y(i)<cutoff ) GOTO 200
      ENDDO
      WRITE (G_IO,99011)
      WRITE (G_IO,99012)
      WRITE (G_IO,99013) alph11 , alph12 , sbnam1 , sbnam2
      WRITE (G_IO,99015)
      WRITE (G_IO,99016) cutoff
      WRITE (G_IO,99011)
      RETURN
 200  DO i = 1 , N
         IF ( X(i)<cutoff ) GOTO 300
      ENDDO
      WRITE (G_IO,99011)
      WRITE (G_IO,99012)
      WRITE (G_IO,99013) alph21 , alph22 , sbnam1 , sbnam2
      WRITE (G_IO,99015)
      WRITE (G_IO,99016) cutoff
      WRITE (G_IO,99011)
      RETURN
!
 300  n2 = 0
      DO i = 1 , N
         IF ( Y(i)<cutoff .AND. X(i)<cutoff ) THEN
            n2 = n2 + 1
            IF ( n2>=2 ) GOTO 400
         ENDIF
      ENDDO
      WRITE (G_IO,99011)
      WRITE (G_IO,99012)
      WRITE (G_IO,99004) alph11 , alph12 , alph21 , alph22
99004 FORMAT (' ','THE ',A4,A4,', AND ',A4,A4)
      WRITE (G_IO,99005) sbnam1 , sbnam2
99005 FORMAT (' ','INPUT ARGUMENTS TO THE ',A4,A4,' SUBROUTINE')
      WRITE (G_IO,99006)
99006 FORMAT (' ','ARE SUCH THAT TOO MANY POINTS HAVE BEEN',            &
     &        ' EXCLUDED FROM THE PLOT.')
      WRITE (G_IO,99007) n2
99007 FORMAT (' ','ONLY ',I0,' POINTS ARE LEFT TO BE PLOTTED.')
      WRITE (G_IO,99011)
      RETURN
!
!-----START POINT-----------------------------------------------------
!
!     DETERMINE THE VALUES TO BE LISTED ON THE LEFT VERTICAL AXIS
!
 400  DO i = 1 , 9
         aim1 = i - 1
         ylable(i) = Ymax - (aim1/8.0_wp)*(Ymax-Ymin)
      ENDDO
!
!     DETERMINE THE VALUES TO BE LISTED ON THE BOTTOM HORIZONTAL AXIS
!     DETERMINE XMID, X25 (=THE 25% POINT), AND
!     X75 (=THE 75% POINT)
!
      xmid = (Xmin+Xmax)/2.0_wp
      x25 = 0.75_wp*Xmin + 0.25_wp*Xmax
      x75 = 0.25_wp*Xmin + 0.75_wp*Xmax
!
!     BLANK OUT THE GRAPH
!
      DO i = 1 , 45
         DO j = 1 , 109
            IGRaph(i,j) = blank
         ENDDO
      ENDDO
!
!     PRODUCE THE VERTICAL AXES
!
      DO i = 3 , 43
         IGRaph(i,5) = alphai
         IGRaph(i,109) = alphai
      ENDDO
      DO i = 3 , 43 , 5
         IGRaph(i,5) = hyphen
         IGRaph(i,109) = hyphen
      ENDDO
      IGRaph(3,1) = equal
      IGRaph(3,2) = alpham
      IGRaph(3,3) = alphaa
      IGRaph(3,4) = alphax
      IGRaph(23,1) = equal
      IGRaph(23,2) = alpham
      IGRaph(23,3) = alphai
      IGRaph(23,4) = alphad
      IGRaph(43,1) = equal
      IGRaph(43,2) = alpham
      IGRaph(43,3) = alphai
      IGRaph(43,4) = alphan
!
!     PRODUCE THE HORIZONTAL AXES
!
      DO j = 7 , 107
         IGRaph(1,j) = hyphen
         IGRaph(45,j) = hyphen
      ENDDO
      DO j = 7 , 107 , 25
         IGRaph(1,j) = alphai
         IGRaph(45,j) = alphai
      ENDDO
      DO j = 20 , 107 , 25
         IGRaph(1,j) = alphai
         IGRaph(45,j) = alphai
      ENDDO
!
!     DETERMINE THE (X,Y) PLOT POSITIONS
!
      ratioy = 40.0_wp/(Ymax-Ymin)
      ratiox = 100.0_wp/(Xmax-Xmin)
      DO i = 1 , N
         IF ( Y(i)<cutoff ) THEN
            IF ( X(i)<cutoff ) THEN
               IF ( Y(i)>=Ymin .AND. Y(i)<=Ymax ) THEN
                  IF ( X(i)>=Xmin .AND. X(i)<=Xmax ) THEN
                     mx = ratiox*(X(i)-Xmin) + 0.5_wp
                     mx = mx + 7
                     my = ratioy*(Y(i)-Ymin) + 0.5_wp
                     my = 43 - my
                     IGRaph(my,mx) = alphax
                  ENDIF
               ENDIF
            ENDIF
         ENDIF
      ENDDO
!
!     WRITE OUT THE GRAPH
!
      DO i = 1 , 45
         ip2 = i + 2
         iflag = ip2 - (ip2/5)*5
         k = ip2/5
         IF ( iflag/=0 ) WRITE (G_IO,99008) (IGRaph(i,j),j=1,109)
!
99008    FORMAT (' ',20X,109A1)
         IF ( iflag==0 ) WRITE (G_IO,99009) ylable(k) ,                  &
     &                          (IGRaph(i,j),j=1,109)
99009    FORMAT (' ',F20.7,109A1)
      ENDDO
      WRITE (G_IO,99010) Xmin , x25 , xmid , x75 , Xmax
99010 FORMAT (' ',14X,F20.7,5X,F20.7,5X,F20.7,5X,F20.7,1X,F20.7)
!
99011 FORMAT (' ','**************************************************', &
     &        '********************')
99012 FORMAT (' ','                   FATAL ERROR                    ')
99013 FORMAT (' ','THE ',A4,A4,' INPUT ARGUMENT TO THE ',A4,A4,         &
     &        ' SUBROUTINE')
99014 FORMAT (' ','HAS ALL ELEMENTS = ',E15.8)
99015 FORMAT (' ','HAS ALL ELEMENTS IN EXCESS OF THE CUTOFF')
99016 FORMAT (' ','VALUE OF ',E15.8)
!
END SUBROUTINE PLOT6