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This ought to be easy!

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  This ought to be easy! Mark Scott <mylastname+ME@talk21.com> - 2013-04-04 11:17 +0000
    Re: This ought to be easy! Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2013-04-04 18:55 +0200
      Re: This ought to be easy! Mark Scott <mylastname+ME@talk21.com> - 2013-04-04 18:59 +0000
        Re: This ought to be easy! Mark Scott <mylastnameME@talk21.com> - 2013-04-06 18:57 +0000

#1739 — This ought to be easy!

I am attempting to create 2D filled surface charts from solar panel 
output data. I have a simple data file for each day's generation, in this 
format:
HH:mm	kW

00:00	0

00:10	0.000

00:20	0.000

00:30	0.000

00:40	0.000
.. and so on, with a power level for each 10-minute interval up to 
23:50. The power level never gets above 3kW.

I want to create a simple black-and-white curve showing the power levels 
by time of day across the 24-hour period. On an ideal day this would look 
like a classic normal distribution curve.

I am using commands such as this:
set yrange [0:5]
set xdata time
set timefmt "%H:%M"
set format x "%H:%M"
set xrange ["00:00":"24:00"]
plot "./2012-06-15.dat" with lines

I am being thwarted by the message "Need full using spec for x time data".

If I re-issue the same "set format" command after the error and replot, 
it draws a chart, but using points not lines. Don't understand - is there 
some proper order to issue the commands in?

Come on, this really should be simple! I have spent hours reading 
different sections of the manual and trying all kinds of variations of 
the plot command and set commands, but I just can't figure it out and am 
getting really frustrated! Can anyone offer a solution, or even a clue?

BTW I am using Version 4.6 patchlevel 0 on Ubuntu 12.10.

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#1740

On 04.04.2013 13:17, Mark Scott wrote:
> I am using commands such as this:
> set yrange [0:5]
> set xdata time
> set timefmt "%H:%M"
> set format x "%H:%M"
> set xrange ["00:00":"24:00"]
> plot "./2012-06-15.dat" with lines
>
> I am being thwarted by the message "Need full using spec for x time data".

So how about you do what the message asks you to: give it a using 
spec(ification), as explained in 'help using'?

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#1741

On Thu, 04 Apr 2013 18:55:41 +0200, Hans-Bernhard Bröker wrote:
> 
> So how about you do what the message asks you to: give it a using
> spec(ification), as explained in 'help using'?

Well I tried! I had tried all sorts of different variations of "using", 
and none of them worked up to the time I made my post.

But I persisted and I did finally get an output more or less like I 
wanted. FWIW, these are the commands I have ended up using:

set yrange [0:5]
set style data lines
set style fill solid
set border 3
set tics nomirror 
set xdata time
set grid ytics
unset key
set timefmt "%H:%M"
set format x "%H:%M"
set xrange ["00:00":"24:00"]
plot "./2012-06-16.dat" using 1:2 with filledcurves lt -1

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#1746

On Thu, 04 Apr 2013 18:59:17 +0000, Mark Scott wrote:

> On Thu, 04 Apr 2013 18:55:41 +0200, Hans-Bernhard Bröker wrote:
>> 
>> So how about you do what the message asks you to: give it a using
>> spec(ification), as explained in 'help using'?

Actually I think what fixed it was dropping the header row from the input 
data file. Gnuplot doesn't like header rows when the xdata is time format.

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