RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 15 years old) and has a wealth of features making it an ideal choice to show charts on your website.

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RGraph can be used for free under the GPL or if that doesn't suit your situation there's an inexpensive (£99) commercial license available.

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I get a error message
Warning: A non-numeric value encountered in /var/www/groeset.com/vannstand/plugins/content/rgraph/lib/rgraph_options.php on line 383

use the following code:

{rgraph width="500" height="400" type="Line"
data="csv" csv_parm="http://vannstand.groeset.com/VannforingOrkla.csv,23" csv_cols=" 2 , 4, 5, 6, 8, 9,10"
title="Vannstand i Orkla"
x_step="2" textAngle="20" chart_alignment="center" tooltip="#val#"
gutterBottom="60" gutterLeft="80" scaleDecimals="2"}test{/rgraph}

http://vannstand.groeset.com/

How can I fix this ?

3 things:

1. That's a PHP error so it's not related to RGraph.
2. Your CSV file appears to have a number of non-data lines at the start.
3. I don't recognise your RGraph "code" - it doesn't appear to be JavaScript.

Richard

It is joomla addon
what should I do to make a nice working graph make a plain page or any ideas ?

Sorry I've not used Joomla before. Try asking about that error on a Joomla support forum or email list if there is one.

For a plain chart try starting with the basic Bar chart demos that come with RGraph in the demos folder.

Richard

hi,
the numbers of your csv-data must have a decimal point instead of a decimal komma. This causes the php error.

if rgraph-joomla plugin is >v.2.1.3 then remove last line of your csv-file or add valid data (last line contains invalid data)