This page details a simple C++ program I wrote to compute some basic statistics for UNIX/Linux command line interface workflows.
I was just working with correlations and wanted to see that my algorithms indeed computed values between -1 and 1 and I was expecting a mean of about 0. So using my
range program, I can check these simple statistics as follows:
$ ./computecorrelations.rb | range N 1264632 sum 9717.46 min -0.996154 max 0.99789 mean 0.00768402 var 0.119903 stddev 0.34627
range program takes a list of values from standard in and computes the statistics (number of elements N, sum of the elements, their minimum and maximum, its mean, variance and standard deviations) and outputs them.
$ echo "1 2 3" | range N 3 sum 6 min 1 max 3 mean 2 var 1 stddev 1
You can download the source from http://anthony.liekens.net/pub/range.cpp and compile it with
g++ -O3 range.cpp -o range
and put it somewhere interestingly, like
sudo cp range /usr/local/bin/