Category Archives: Software
A new year, seven publications to write and a short movie
Dear scatterers, First of all, allow me to wish you a very happy 2013, wishing you much comfort, many good meetings and world peace. With that out of the way, this year might be different from others on this weblog, as I have to spend oodles of time on my “favourite” activity: trying to publish. [...]
Movie: Monte-carlo fitting of anisotropic scattering
I have worked on monte-carlo procedures for a while now. Initially (while working for Aarhus University), I managed to make these work to extract the particle size distribution from isotropic scattering patterns, and it works fine and quick. Now though, I managed to get this trial-and-error procedure to work for whole 2D pattens as well! [...]
Data processing flowchart and news on an old publication
Short news first; by going through the motions and waiting for Elsevier to get back to me, I have gotten permission (for the royal sum of 0.00 eurodollars) to repost one more paper from Polymer on my site. So that has now gone in the 2010 publications page here. Then it is time to give [...]
Detail-preserving 2D binning, part 1: the appetizer
(Sorry about the hiatus, there’s been a period filled with that noblest of Japanese traditions: paperwork!) If you want to do fitting of a 2D image, you want to preserve the information in the entire image. 2D fitting is quite computationally intensive, so you still want to reduce the number of pixels in your images. [...]
Everybody hates statistics…
Everybody hates statistics [1]… … but it can be of major importance in our small angle world. While very few papers on small-angle scattering discuss statistics, they can tell you whether your observations are real or just imaginary. In addition, statistics will let you know whether you have been able to describe your scattering [...]
Live Fourier Transform for Windows
Since entering paternity leave, I have had little time to come up with something new to post here. However, one colleague was so kind as to send me his Windows version of the live fourier transform program discussed before. His runs on his Lenovo laptop (but may be more widely applicable) and uses the Windows [...]
Live FT video
A demonstration of the live Fourier Transform showing scattering patterns can be seen here:
Live Fourier transform
During some recent presentations, I have used a small matlab program giving me a live Fourier transform of the laptop camera input. It can be used in combination with some printed “structures” to show what we would see on a SAXS or WAXS detector. The idea is not mine, I heard that it was used [...]
Errors and improvements in the perfectpattern code
Hi all, Just a quick heads-up, there are some minor errors in the perfectpattern code with respect to the convergence criteria. Also I have made some improvements and added a “counting statistics”-like Poisson error to more closely approach real data. These updates have now been posted on the software page.
More details for the monte-carlo code
As promised, some more details which hopefully make the monte-carlo code (discussed here) more useful to you; the software documentation. softwaremanual_mcfit In the documentation are also some examples using the scattering pattern generators discussed before. Let me know if you canor cannot get it to work and post your findings here (or father, on the [...]