[Gnuplot-info] need help with stacked histogram

[Steve C. <sc...@ja...>]

All the samples tend to assume that you are working from a data file 
where the header row contains the labels for each piece of the stack.  
That is not the case in my situation.  I want to supply the labels from 
each stack in the script.

My script is as follows:

#set terminal png transparent nocrop enhanced size 900 600
#set output 'latest-connections.png'
set title "Database Connections"
set key below
set xdata time
set timefmt "%Y-%m-%d %H:%M"
set format x "%H:%M"
set style data histogram
set style histogram rowstacked
set style fill solid noborder

plot 'latest-connections.dat' using 1 "%Y-%m-%d %H:%M", \
'' using 2 title "A", \
'' using 3 title "B", \
'' using 4 title "C", \
'' using 5 title "D", \
'' using ($6-($2+$3+$4+$5)) title "other"
------------------------------------------

Data File is as follows:

2009-10-17 10:15 5 0 0 22 27
2009-10-17 10:17 5 0 0 8 13
2009-10-17 10:19 5 0 0 8 13
2009-10-17 10:31 5 0 0 13 18
...

Error message is:

 "connections2.gplot", line 17: Please use between 1 and 7 conversions, 
of type double (%lf)

Not sure what this means or what I must do to correct it.

Can someone help?

Thanks.