C Library Functions  - plot (3)

NAME
plot(3f) - [M_datapac:GENERIC_LINE_PLOT] yields a one-page printer plot of Y(I) versus X(I)

CONTENTS

Synopsis
Description
Options
Examples
Author
Maintainer
License

SYNOPSIS
Subroutine plot (X, Y, N) 

     Real(kind=wp) :: (In) ::  X(:)
     Real(kind=wp) :: (In) ::  Y(:)
     Integer, Intent (In) ::  N

DESCRIPTION
This subroutine yields a one-page printer plot of Y(I) versus X(I).

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.

OPTIONS
Y The REAL vector of (unsorted or sorted) observations to be plotted vertically.
X The REAL vector of (unsorted or sorted) observations to be plotted horizontally.
N The integer number of observations in the vector Y.

EXAMPLES
Sample program: 

   program demo_plot
   use M_datapac, only : plot
   implicit none
   integer ::  i
   real, allocatable ::  x(:), y(:)
     x=[(real(i),i=1,30)]
     y=0.075*(x**4)-0.525*(x**3)+0.75*(x**2)+2.40
     call plot(x,y,size(x))
     y=[(real(i)/10.0,i=1,30)]
     x=y**3.78-6*y**2.52+9*y**1.26
     call plot(x,y,size(x))
   end program demo_plot
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

Nemo Release 3.1 plot (3) February 23, 2025
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