[R] Digitizing the Plot
Hi R,
Wanted to check if there are any packages available for getting the
(x,y) data points of a graph or a plot, which is in the image format.
Say, the plot could be a published report, and I want to get the points
of the curve plotted. (I am speaking something related the subject
discussed in http://www.uniphiz.com/digitizing.htm)
Thanks,
Shubha
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Re: [R] Digitizing the Plot
Hi! Wanted to check if there are any packages available for getting the (x,y) data points of a graph or a plot, which is in the image format. Say, the plot could be a published report, and I want to get the points of the curve plotted. (I am speaking something related the subject discussed in http://www.uniphiz.com/digitizing.htm) I am not aware of an R-package but there are several applications that produce tables from graphs which you can import into R afterwards. A few examples: g3data (LINUX, opensource) engauge (LINUX/Windows, opensource) Grab it! (Windows, commercial) Datathief (LINUX/Windows/Mac, shareware) UN-SCAN-IT (Windows/Mac, commercial) Google digs up quite a few additional hits with digitizing graph data. cu Philipp -- Dr. Philipp Pagel Lehrstuhl für Genomorientierte Bioinformatik Technische Universität München Wissenschaftszentrum Weihenstephan 85350 Freising, Germany http://mips.gsf.de/staff/pagel __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Digitizing the Plot
The grImport package seems to provide such possibility for vector
graphics,
http://www.stat.auckland.ac.nz/~paul/Talks/gddg.pdf
imageJ is another open-source option.
baptiste
On 16 Apr 2009, at 16:44, Shubha Vishwanath Karanth wrote:
Hi R,
Wanted to check if there are any packages available for getting the
(x,y) data points of a graph or a plot, which is in the image format.
Say, the plot could be a published report, and I want to get the
points
of the curve plotted. (I am speaking something related the subject
discussed in http://www.uniphiz.com/digitizing.htm)
Thanks,
Shubha
This e-mail may contain confidential and/or privileged i...{{dropped:
13}}
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
_
Baptiste Auguié
School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK
Phone: +44 1392 264187
http://newton.ex.ac.uk/research/emag
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Re: [R] Digitizing the Plot
I don't know of anything that does the automated process like the example
software you link to, but here is one procedure that you can use to do it by
hand.
1. Brind the graph into R and plot it (as an image) using rimage or EBImage (or
other) packages.
2. use the locator function to find the coordinates (under the current user
coord system) of 2 points that you know the coordinates of (in the scale of the
graph, desired coord system).
3. Use the updateusr function from the TeachingDemos package to convert the
coordinates to match the axes (using the points from the previous step).
4. Use the locator function and click on the points/curve in the graph. The
result will be an approximation to the data of interest (you may want to round
or do other clean-up, or just use as is).
Hope this helps,
--
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.s...@imail.org
801.408.8111
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-
project.org] On Behalf Of Shubha Vishwanath Karanth
Sent: Thursday, April 16, 2009 9:44 AM
To: r-h...@stat.math.ethz.ch
Subject: [R] Digitizing the Plot
Hi R,
Wanted to check if there are any packages available for getting the
(x,y) data points of a graph or a plot, which is in the image format.
Say, the plot could be a published report, and I want to get the points
of the curve plotted. (I am speaking something related the subject
discussed in http://www.uniphiz.com/digitizing.htm)
Thanks,
Shubha
This e-mail may contain confidential and/or privileged
i...{{dropped:13}}
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-
guide.html
and provide commented, minimal, self-contained, reproducible code.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
