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MJ Rutter's Computing Page
This page contains computing-related stuff produced by me. Those searching for evidence that I have a life outside of computing need to search elsewhere, and there is also a more formal profile. I may enjoy a schizophrenic existance as mjr and mjr19, but my email address is always the latter. The correct University (not Departmental) domain is not hard to guess.
Notes on the integration of 1D functions with sharp peaks (PDF) (Feb 2014).
Notes, benchmarks and sources for Linpack in Fortran, C, python and Java (Jan 2016).
Notes on the linear congruential random number generator, with particular reference to stepping the generator in log2N time, and thus getting results independent of the number of threads after parallelisation with OpenMP. Fortran and C examples included.
A separate page now exists for my notes on CASTEP.
I am the author and maintainer of c2x, a pre- and post-processor for Castep and other DFT codes, offering a range of format conversions, unit cell transformations, and analysis of densities, structures and bands.
Those programs which I have written and distribute fairly freely, which include bmp2eps, psimages and eps2gif, are all found on MJR's Software Page.
Notes on IT topics
These notes are taken from TCM's intranet, and may be useful for a wider audience.
- Optimising vector operations on the complex type in Fortran
- Simple Gantt charts in LaTeX
- Bézier curves
- HP JetDirect cards
- glmark2 scores for various Radeons used in TCM
- Intel's variable clock speeds and the impact on benchmarking
- Intel's maths kernel library
- Intel's compiler and CPU selection
- Linux and huge pages
- Building the alpine mail client on MacOS
One-off Graduate Lectures
These are generally more fun. Local users can find them on the relevant bit of TCM's computing pages, with a few being available on the above MPhil/CDT page.
Some older ones include:
- Graphics file formats, an overview of image formats: GIF, PNG, EPS, PDF, SVG. (Easter 2017)
- LaTeX (Lent 2005)
- Encapsulated PostScript (Lent 2005)
- UNIX: an Operating Environment (Lent 2004)
Part II Computational Physics
A one-off attempt to teach Fortran 90 to over a hundred undergraduates some while ago.
The following handouts may be freely used for individual learning (or entertainment). I am unaware that anyone claims copyright on the images, or that anyone other than myself can claim copyright on the text.
- An introduction to (scientific) computing
- An introduction to PWF UNIX (as it was in 2001/2)
- Fortran 95 F95 and NAG's F77 library, including exercises.
- UNIX utilities mostly gnuplot and gv
C and Fortran
My infamous C vs Fortran document. Yes, I should probably update it to cover C99, F2003, etc.
An Introduction to UNIX
Everyone has to write one once. So this is mine.