I was reading an article from Datamation on 70 Open Source Replacements for Small Business when I noticed a glaring omission. Where are the software applications for Operations Research and Analytics? So here is my best addendum to this art...
Posts Tagged ‘ Optimization ’
Single variable optimization
Optimization means to seek minima or maxima of a funtion within a given defined domain. If a function reach its maxima or minima, the derivative at that point is approaching to 0. If we apply Newton-Raphson method for root finding to f’, we can get the optimizing f. Read More: 223 Words Totally
Single variable optimization
Optimization means to seek minima or maxima of a funtion within a given defined domain. If a function reach its maxima or minima, the derivative at that point is approaching to 0. If we apply Newton-Raphson method for root finding to f’, we can get the optimizing f. Read More: 223 Words Totally
R Optimization Function Test
Using Kalman Filter for CIR interest rate model parameter estimation was introduced at my previously post Kalman Filter finance, soon after that I got a few comments saying the final results are unstable and highly depend on the initial values, that'...
Compcache on Ubuntu on Amazon EC2
The following fully-automatic Bash script downloads, compiles, and initializes compcache version 0.6.2 on Ubuntu Karmic Koala (9.10). This script creates two swaps with a maximum of 4GB uncompressed size each. Two swaps are used to take advantage of 2 CPUs (or CPU cores in a multicore CPU). Compcache is a fascinating memory compression system. The 
Social Media Analytics Research Toolkit (SMART@znmeb) Is Moving Into Private Beta
Download "Getting Started with the Social Media Analytics Research Toolkit" (pdf, 1.25 megabytes) Download the Social Media Analytics Research Toolkit My Social Media Analytics Research Toolkit is about to move into private beta. What's in the release?...
R: Memory usage statistics by variable
Do you need a way to find out which individual variables in R consume the most memory? # create dummy variables for demonstration x <- 1:1000 y <- 1:10000 z <- 1:100000 # print aggregate memory usage statistics print(paste('R is using', mem...
Plotting PDQ Output with R
One the nice things about PDQ-R (coming in release 5.0) is the ability to plot PDQ output directly in R. Here's a PDQ-R script, together with the corresponding graphical output, that I knocked up to show the effect on the throughput curve of adding mor...
evolutionary algorithm optimization
In the post Optimization packages dozens of optimization routines can be downloaded, here I am going to share a special optimization method: evolutionary algorithm. Evolutionary algorithms (EAs) are search methods that take their inspiration from natu...
Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
