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PLPlot example 1

!!! note "" This example shows how to plot a graph by using plplot.

Modules and classes​

Usage​

IMPORT modules and declare variables

PROGRAM main
  USE easifemBase
  IMPLICIT NONE
  INTEGER, PARAMETER :: NSIZE = 101
  REAL( DFP ), DIMENSION(NSIZE) :: x, y
  REAL( DFP ) :: xmin = 0.0, xmax = 1.0, ymin = 0.0, ymax = 100.0
  INTEGER :: ierr

Prepare data to be plotted.

  x = arange(0, NSIZE-1) / REAL(NSIZE-1, DFP)
  y = ymax * x**2

Parse and process command line arguments

  ierr = PLPARSEOPTS( PL_PARSE_FULL )
  IF(ierr .NE. 0) THEN
    CALL Display( "plparseopts error" )
    STOP
  END IF

Initiate the PLPLOT enviroment

  CALL PLINIT

Create a labelled box to hold the plot. We have specified the box dimension

  CALL PLENV( xmin, xmax, ymin, ymax, 0, 0 )
  CALL PLLAB( "x", "y=100 x#u2#d", "Simple PLplot demo of a 2D line plot" )

Plot the data that was prepared above.

  CALL PLLINE( x, y )

Close PLplot library

  CALL PLEND
END PROGRAM main