#*****************************************************************************80
#
## album_bar creates a bar plot from yearly music sales records.
#
#  Licensing:
#
#    This code is distributed under the MIT license. 
#
#  Modified:
#
#    29 July 2020
#
#  Author:
#
#    John Burkardt
#
cat ( date ( ), "\n" )
cat ( "\n" )
cat ( "album_bar\n" )
cat ( " ", version$version.string, "\n" )
cat ( "  Make a bar plot from yearly music sales data data." )

filename = "album_data.txt"
data <- read.table ( filename, header = FALSE )

filename = "album_bar.png"
png ( filename )
barplot ( data[,2], 
  names.arg = c ( '2007','2008', '2009', '2010', '2011', '2012', '2013', 
    '2014', '2015', '2016', '2017' ),
  col = 'red',
  xlab = "Year", ylab = "Millions",
  main = "Music album sales, all formats" )
grid ( )
cat ( '  Graphics saved as "', filename, '"\n' )
#
#  Terminate.
#
cat ( "\n" )
cat ( "album_bar:\n" )
cat ( "  Normal end of execution.\n" )

quit ( )