Stacked-area with date format at x-axis on Gnuplot - date

Question

I have created graphs using filledcurves. Now, the graphs looks bad because long range of data.
This is my data:
a b c d e f g h i
201312 49 26 34 30 14 25 9 4 1
201311 38 22 47 30 9 9 4 3 1
201310 44 24 43 38 9 14 5 7 0
201309 65 18 33 39 15 12 4 5 1
201308 42 31 44 30 5 11 0 2 2
201307 58 27 35 29 8 4 2 4 2
201306 30 22 15 17 2 6 3 4 0
201305 61 52 20 16 11 12 2 3 0
201304 62 60 33 18 13 9 5 6 0
201303 43 53 49 27 9 11 7 0 0
201302 31 30 42 27 10 8 4 2 0
201301 42 30 20 47 9 13 3 2 1
201212 26 19 39 24 9 11 0 0 0
201211 26 26 30 28 1 2 0 2 1
201210 55 46 34 30 13 5 0 2 1
201209 56 31 27 28 27 13 2 4 1
201208 48 75 38 46 22 10 0 1 0
201207 60 56 37 47 19 11 2 1 0
201206 60 41 37 28 17 12 5 1 0
201205 49 43 38 46 15 16 2 2 0
201204 43 50 36 33 4 7 3 0 2
201203 49 63 35 43 16 7 1 2 0
201202 43 59 59 52 16 13 3 4 1
201201 51 44 30 37 20 9 4 1 0
201112 50 38 36 36 8 2 3 1 1
201111 75 35 30 36 16 7 3 3 1
201110 68 53 41 27 11 15 1 2 1
201109 68 46 48 47 16 19 4 0 1
201108 45 41 20 36 17 10 1 0 0
201107 48 34 30 24 13 7 3 3 1
201106 49 29 24 25 5 6 0 3 0
201105 45 35 21 37 1 7 2 1 0
201104 53 35 23 18 4 6 1 5 1
201103 58 42 20 18 6 4 1 0 4
201102 54 32 19 20 4 10 0 2 0
201101 42 41 21 28 3 6 1 2 1
and this is my gnuplot file:
set terminal postscript eps color font 20
set xtics 1 out
set tics front
#set style fill transparent solid 0.5 noborder
set key below autotitle columnheader
set ylabel "Count"
set xlabel "across time"
set output 't1.eps'
set title "t1-Across time of Aspects"
set xtics 1
plot for [i=10:2:-1] \
"< awk 'NR==1 {print \"year\",$".(i-1)."} NR>=2 {for (i=2; i<=".i."; i++) \
{sum+= $i} {print $1, sum; sum=0} }' data.dat" \
using (column(2)):xtic(1) with filledcurves x1 t column(2)
When I add time in xdata:
set xdata time
set timefmt "%Y%m"
set xtics format "%b"
Erros message:
Need full using spec for x time data
Is the Errors because of my date format? I have googling this and do not have any answer about it. Please give me suggestion about this.

Answer 1

In the script you show, you specify only a single column in the using statement (besides the xtic). That means, that this value is taken as y-value and the row number is implicitely used as x-value.
When using time data, you must explicitely specify all columns which are needed for the plotting style, there is no assumption about what might be the first column. Use:
set key below autotitle columnheader
set ylabel "Count"
set xlabel "across time"
set tics front
set xdata time
set timefmt "%Y%m"
set xtics format "%b'%y"
set autoscale xfix
plot for [i=10:2:-1] \
"< awk 'NR==1 {print \"year\",$".(i-1)."} NR>=2 {for (i=2; i<=".i."; i++) \
{sum+= $i} {print $1, sum; sum=0} }' data.dat" \
using 1:2 with filledcurves x1 t column(2)
Result with 4.6.4:
I guess you don't want xtic(1) if you have time data and specify the x format.