FMi Software FMi software may be freely downloaded under the terms of the software license. CDI Processor 3.21 for MATLAB - A collection of CDI processing tools developed for MATLAB between 1995 and 2005. Unzip the files to a directory that is on MATLAB's path and type "cdi" at the MATLAB command prompt to bring up the CDI user interface. Coming Soon . . . CDI Processor ANSI C++ Library The plan for this project is to release an open source, cross platform, C++ version of the CDI Processor and Tools.