#*****************************************************************************80
#
## nile_plot makes a line plot of yearly flood levels for the Nile.
#
#  Licensing:
#
#    This code is distributed under the MIT license. 
#
#  Modified:
#
#    18 August 2020
#
#  Author:
#
#    John Burkardt
#
cat ( date ( ), "\n" )
cat ( "\n" )
cat ( "nile_plot\n" )
cat ( " ", version$version.string, "\n" )
cat ( "  Make a line plot of yearly Nile flood levels.\n" )

filename = "nile_data.txt"
data <- read.table ( filename, header = FALSE )
height = data[,2]

filename = "nile_plot.png"
png ( filename )
plot ( data[,1], data[,2], 
  xlab = "Year", 
  ylab = "Height of Nile at Maximum Flood",
  main = "Yearly Nile Flood Height",
  type = 'l',
  col = 'green' )
grid ( )
cat ( '  Graphics saved as "', filename, '"\n' )
#
#  Terminate.
#
cat ( "\n" )
cat ( "nile_plot\n" )
cat ( "  Normal end of execution.\n" )
quit ( )