Re: Evaluate scanned plot?

[Johnny]

Andreas Stahel <address@hidden> writes:

> 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
Thanks Andreas, this is also very useful information! I will spend some
time reading your notes and learn, but for immediate purposes I'll stick
with g3data.

\Johnny