Re: [Gnuplot-bugs] set table using time format data

[<pe...@pi...>]

On Thu, 03 May 2007 22:43:12 +0200, Hans-Bernhard Bröker  
<HBB...@t-...> wrote:

> pl...@pi... wrote:
>
>> here's a line from my working .gnu that does plot the line I want to
>> output to a table:
>>
>>
>>    plot  "150tank-txC.data"   using 1:($1<"14:00")?(P( Th4($3-2.0) -
>>    Th5($2) )/10):(P1( Th4($3-2.0) - Th5($2) )/10) with lines t "useful
>> power"
>
> That's almost certainly not going to work as planned.  Time/date data
> and $1 notation for extended using columns don't mix.  If it ever
> appears to work, that's a fluke.

OK let's forget the conditional syntax, that's irrelevant here because  
I've already stripped this down to the most simple form and posted that as  
the error.

>
>> however , if I use this in a table context I get an error:
>
>>    gnuplot> load "150tank-txC.gnu"
>>           "150tank-txC.gnu", line 46: Bad format character
>
> I'm reasonably sure you get the same basic error in every other context
> -- you just don't see it.
>

Do you mean that gnuplot is picking this up here and choking on it but  
deals with it incorrectly elsewhere without producing an error ?

> For more precise help, you'll have to actually _show_ us that command
> script (or a sufficient subset reproducing the problem).
>

I thought I had done just that, I'll try again.

Here's the start of the data. All other lines are empty or start with #



12:00  6.89 8.63 6.31 6.77 7.84
12:17  6.84 8.45 5.96 6.67 5.50
12:24  6.88 8.26 5.78 6.64 5.43
12:38  6.60 7.65 5.16 6.38 4.61

Here's the essencials of the script, calibration-results.gnu was created  
by save command with the plot command commented out later so it contains a  
full set of instructions. I believe the time data settings needed are  
explicitly set below so should override anything done be that file.

# load thermistor calibration data and functions: eg Th5() etc.
load "calibration-results.gnu"

set xdata time
set timefmt "%H:%M"

set format x "%02H:%02M"
set xr ["11:30":"18:30"]

datafile="150tank-txC.data";

set title "150 litre tank forced flow test 12 - PC cover"
set yrange [-5:85]
set y2range [-50:850]
set y2tics 0,100,800
set xlabel "time CES: sol +2h"
set ylabel "temp / C"
set y2label "power / W"
set key box
set key top right


   set table "tmp.data"
#  plot datafile  using 1:(Th5($2));
#  plot datafile  using 1:($2);
#  plot datafile  using (timecolumn(1)):($2);
#  plot datafile  using (column(1)):($2);
   unset table


plot datafile   using 1:(Th5($2))  with lines t "tank outlet"




Now if I uncomment each of those table lines in turn here's the errors I  
get.



gnuplot> load "150tank-txC.gnu"
          "150tank-txC.gnu", line 47: Bad format character

gnuplot> load "150tank-txC.gnu"
          "150tank-txC.gnu", line 48: Bad format character

gnuplot> load "150tank-txC.gnu"
          "150tank-txC.gnu", line 49: Bad format character

gnuplot> load "150tank-txC.gnu"
          "150tank-txC.gnu", line 50: Bad format character




I seems pretty clear that in table mode it is unable to parse the the time  
data whatever way I go about it.

If all are commented out the graph gets plotted beautifully on wxt , png,  
or svg by the later plot command.



I hope that gives you a clearer picture of what is happening.

Thanks for your help.