Re: Evaluate scanned plot?

[Andreas Stahel]

On Mon, Oct 25, 2010 at 11:17:50PM +0100, Johnny wrote:
> > I have a few scanned plots that I would like to extract data from,
> > either automatically or manually into a csv or similar for further
> > analysis in Octave. I have struggled to find any method or application
> > to achieve this and have no idea where to look further.
> >
> > Maybe not directly an Octave issue, but I am sure there is ample
> > experience in the list of this and would appreciate any suggestions!
> >
> > (Using Fedora 13)

The solution below is not as well written as g3data, but useful nonetheless.

With older versions one could read directly from screen, using the X window 
system.
Due to the attempt to move closer to a commercial product the feature was given 
up.
For the convenience of my students (and myself) I keep a copy of the "old"
code around. Thus I can call xinput() and the click on points on the screen to 
grab data.
Find the documentation in Section 2.9 of my lecture notes at
//staff.ti.bfh.ch/sha1/Labs/PWF/Documentation/OctaveAtBFH.pdf
and the code at
//staff.ti.bfh.ch/sha1/Labs/PWF/Codes/Interpolation/octave/

With best regards

Andreas


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