gnuplot - Begin a plot on a specific day of the week -

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i'm learning gnuplot working on tidal data, in monthly files, in format:

2011/03/01  tue 08:42   9.39    h 2011/03/01  tue 15:04   0.2     l 2011/03/01  tue 21:18   8.67    h 2011/03/02  wed 03:16   0.71    l 2011/03/02  wed 09:31   9.51    h 2011/03/02  wed 15:49   0.09    l 2011/03/02  wed 22:01   8.91    h 2011/03/03  thu 04:01   0.48    l 2011/03/03  thu 10:14   9.58    h 2011/03/03  thu 16:28   0.05    l 2011/03/03  thu 22:39   9.11    h

all far: can output stacked plots pdf multiplot layout setup, i'd have weekly plots run monday-sunday.

with fractional weeks, first week, how can this? can set xrange manually, need re-done each weekly plot command.

what i'd figure out 2 things:

  • a way handle first week problem;
  • a way automate xrange each succeeding week (i.e., have gnuplot parse timestamp , start new plot each monday? can perhaps using ternary operator?)

setup:
gnuplot: version 4.4 patchlevel 2
osx 10.6.6

setup & plot commands:

set timefmt "%y/%m/%d-%h:%m" set origin 0,0 set xdata time unset key set samples 1000 mydate(col1,col3)=sprintf("%s-%s",strcol(1),strcol(3)) set grid noxtics set xtics nomirror font "arial,10" tc rgb "blue" set xtics offset 0,0  # required position of tic labels when stacked. set yrange [-3:13]  set ytics 3 set grid ytics set x2data time set x2tics 86400 set grid x2tics set x2tics 86400 set format x2 "%d"    # displays number of day of month set x2tics offset 3.5,-3 font "helvetica,20"    # required position of numbers when stacked. #### set size 1,.2    # un-comment setting stacked layout. set tmargin 3   # gives adequate room between each row of days + labels. set lmargin 5 set bmargin 2 set rmargin 2 plot 'monthlytidedatamarch.txt' u (mydate(1,3)):4:xticlabels(strcol(4) . " \n" . strcol(3) ) lc rgb "green" lw 3 sm cspl notitle

i use bash script , use "date" program. probable need tweak date formats, etc., in principle;) should work...

# write dates temporary file, create date range # each line in input file echo -n ""> tmp.out while read line;       d=${line:0:22}       y=$(date --date "$d" +%y)       w=$(date --date "$d" +%w)       m=$(date --date "$y-01-01 +$w weeks -1 week +2 day" +%y-%m-%d)       s=$(date --date "$y-01-01 +$w weeks -1 week +8 day" +%y-%m-%d)       echo '"'$m'":"'$s'"' >> tmp.out done < data.txt  # make them unique uniq tmp.out > dates.out  # create gnuplot input file, needs code above cat <<eof > in.gnu reset eof  # add plot command each date range.  # needs plot command , perhaps more plot specific data (title, etc.) while read line;    cat <<eof >>in.gnu    set xrange [$line]    plot "data.txt" u 1:2 eof done < dates.out

the script generates gnuplot input file can run on data.


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