- NOTE: these files have be scanned with anti-virus software but
it is always good practice to check with your own local anti-virus software.
The files contain only data files, largely PDF and XML based data and plot files.
All the plot, data and stat files are in XML format internally and can be checked with a
good text editor if needed.
- This is a brief tutorial by Dr David Nicholls on how to ﬁt curves (polynomials, rational polynomials)
and surfaces (biquadratic) to data. It should give you enough familiarity
with the process to explore further:
- The data and plot file for the hydrogen line figure in the example screens is included here with brief notes
on how to set it up and to experiment:
New Home for Graf
This is the new more permanent home for the Graf application.
Please update any bookmarks, although all older links should be
redirected here automatically. There will be new Apple AppStore links as well.
Graf as it is now will become Graf on the Mac App Store as a fully current system
compatible, but legacy application that continues works back to OSX 10.9 Mavericks for
older computers. When the new v6.x is ready it will be called Graf X.
So when fully replacing Graf there will be no need to retain v5.x on any but very old mac computers using old
systems. No new features will be added to v5.2.x, although bug fixes will be
Currently a new version 6 of Graf, Graf X, that uses more modern system facilities is
being developed and will carry the Graf name and a modernised icon. It will
continue to support all older files and file formats into the future.
Non App Store Installation
Download and double click the zip file to get the app, and simply drag it to the Applications folder.
You may check the MD5 checksum using openSSL if you wish ( commandline > openssl md5 Graf519-199.zip ). The software has been virus checked
and Notarised by Apple to be clean and safe, but you may prefer to check it with your own tools. Similarly for the tutorial zip file above.
Graf is a sandboxed app with limited access to only its required resources, it cannot access microphone, camera, contacts,etc.
It may use the network to check this site only for new versions, but that is optional and under the users control.
NOTE: you will need to open Graf, giving permission to open the new version, then quit and logout and back in,
before icon and file quicklook previews will work. This is a side-effect of Apple's
gatekeeper security system, and not in Graf's control.
Use get info on a .data file and tell the system to use Graf to open .data files and use the change all.. button to get back Graf icons if you prefer. Otherwise
drag onto Graf or open with Graf etc, then save as... if you want new file type/extensions.
Graf respects user privacy as far as is possible.
Graf collects no usage or personal or any other information whatsoever,
and any crash reports are anonymous. I do not retain any logs or
reports beyond the time taken to fix any problems.
Being free software there is no financial information involved at any point.
Downloads and version check server logs are cleared regularly,
no stats on user counts or similar are kept.