The FileSystemWatcher .NET class listens to the file system and it is catching any changes and notifications in it. When directories, or files in directories, are changed, events are raised. When a file is created, the FileSystemWatcher class will normally be notified twice. However, up to 4 or more “events” can be fired depending on …
Like many others, I have started using cloud services to sync my data across computers. Although there are many nice alternatives like Dropbox and so on, my choice until now is SugarSync. It is very nice and it has completely removed the manual copying of files using FTP that I used to do. I really …
[SOLVED] SugarSync on Mac puts files in Trash, “alias” problems Read More »
The most commonly used function to calculate the matrix rank is probably the one in the MATLAB software package [1]. It is based on the calculation of singular values of the matrix A, and the number of singular values that are greater than some tolerance defines the rank. The algorithm is simple: r = svd(A); …
During 2011 year, I have tried many different ways of making a PLS algorithm (PLS1) as stable possible. The goal was to make it as numerically good as the SVD implemented in MATLAB. The pseudocode that solved the PLS1 case for one y‑varable is shown below and it includes the addition of null vectors to …
There are many methods to obtain null vectors to a given set of vectors. One of the numerically best methods is implemented in MATLAB, based on singular value decomposition, SVD. Null vectors can be used for many different things; one of them is to remove properties that are ore orthogonal to another, given property. Such …
Please note that this is not regarding the Lanczos or the PLS bidiagonalization algorithm. This is about the Householder bidiagonalization algorithm. The difference is huge. For example, there are no y‑variables in the Householder decomposition. It is a decomposition of X that results in a factorization with a bidiagonal matrix in the middle, similar to …
A fast Householder bidiagonalization algorithm Read More »
I decided to buy Apple Remote Desktop because I was tired of using Chicken of the VNC and others for several reasons. Keyboards were not working properly and I need to be able to switch between Swedish, English and Japanese. My Mac Pro is set up with dual monitors, I like this when working with …
I got a request to send the code of the nine algorithms that were compared in “A comparison of nine PLS1 algorithms” and published in the Journal of Chemometrics 2009; 23: 518–529 and led to the Kowalski price 2010 for best theoretical paper. Then I thought it would be even better if they would be …
My old videos about analytical separation processes should be added to this site. The scripts are still good and easy to modify to simulate different scenario by changing a few parameters. When I first made them in 1996 and 1999, I saved them in mpeg1 formats. Nowadays, other formats are more popular, especially MP4 that …
I bought the Flowplayer in 2009 to run flash videos on this site. While updating, I thought that the jwplayer would be a better choice, so I bought that ones as well. I especially liked the ease of making fall-backs (fail-overs) and combining with HTML5 to handle iPhones and iPads. The problem was that the …
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