This is Matlab wrapper for kx kdb+ based on dropped by Mathworks part of Trading Toolbox.
This projects supports kdb+ v4.1
As of MATLAB R2021a, Trading Toolbox has been merged into Datafeed Toolbox.
As a part of this merge, a subset of the functionality was removed from the toolbox and is being distributed via File Exchange or MATLAB Answers.
In order to use Kx Systems, Inc. kdb+, "kx", functionality, download the attached ZIP file and extract the folder contents into a location that is on your MATLAB path.
Please see link to matlabcentral answer.