Question: how to install vlfeat in matlab?
Answer: One-time setup. Download and unpack the latest VLFeat binary distribution in a directory of your choice (e.g. ~/src/vlfeat ). ... 
Permanent setup. To permanently add VLFeat to your MATLAB environment, add this line to your startup.m file: run('VLFEATROOT/toolbox/vl_setup') ... 
Getting started.