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Top Forums Shell Programming and Scripting Problem creating graph with gnuplot with time on x-axis Post 302789799 by hakro807 on Thursday 4th of April 2013 08:30:12 AM
Old 04-04-2013
Problem creating graph with gnuplot with time on x-axis

Let me start by saying I'm new to gnuplot and not very good at unix at all..

Anyway, I'm each minute measuring temperature and humidity and saves the last 60 readings along with time in a textfile, values_minute.

The contents of the file is formatted like this: time temperature humidity

Code:
14:10 22.8 19.1
14:11 22.8 19.1
14:12 22.8 19.1
14:13 22.8 19.0
14:14 22.8 19.0
14:15 22.8 19.0
14:16 22.8 19.0
etc...

I'm trying to create a graph using gnuplot, working with the shell first. Later I will do it with a script that will run once a minute to generate a "realtime" graph to be publish on a web site.

Code:
gnuplot
set terminal png
set output "graph_realtime.png"
set yrange [10:50]
plot "./values_minute" using 1:2 title 'Temperature' with lines; \
"./values_minute" using 1:3 title 'Humidity' with lines

But I'm given the error "invalid command". I'm quite frankly lost.

Last edited by radoulov; 04-04-2013 at 10:09 AM..
 

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BNO_PLOT(1)															       BNO_PLOT(1)

NAME
bno_plot - generate interactive 3D plot of IO blocks and sizes SYNOPSIS
bno_plot [ -h | --help ] [ -v | --verbose ] [ -K | --keys-below ] [ <file...> ] DESCRIPTION
bno_plot is a visualization tool for the block layer IO tracing tool called blktrace(8). As noted in its documentation, blktrace is a block layer IO tracing mechanism which provides detailed information about request queue operations up to user space. bno_plot utilizes gnuplot to generate a 3D plot of the block number output from btt. If no <files> are specified, it will utilize all files generated after btt was run with -B blknos (meaning: all files of the form blknos*[rw].dat). The -K option forces bno_plot to put the keys below the graph. If it is not specified, all keys for input files are put in the upper right corner of the graph. If the number of devices exceed 10, then bno_plot will automatically push the keys under the graph. To use this utility, the gnuplot package needs to be installed. To exit the plotter, enter 'quit' or ^D at the 'gnuplot> ' prompt. AUTHORS
bno_plot was written by Alan D. Brunelle. This man page was created from the blktrace documentation by Bas Zoetekouw. REPORTING BUGS
Report bugs to <linux-btrace@vger.kernel.org> COPYRIGHT
Copyright (C) 2008 Hewlett-Packard Development Company, L.P. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law. This manual page was created for Debian by Bas Zoetekouw. It was derived from the documentation provided by the authors and it may be used, distributed and modified under the terms of the GNU General Public License, version 2. On Debian systems, the text of the GNU General Public License can be found in /usr/share/common-licenses/GPL-2. SEE ALSO
btt (1), gnuplot (1), blktrace (8), blkparse (1), verify_blkparse (1), blkrawverify (1) blktrace git-20080213182518 February 22, 2007 BNO_PLOT(1)
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