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jsfeat function is not accessing

I am working on JSFEAT but when I start using this library the function is not accessing. resource at:

   <script src="js/inspirit-jsfeat-4f32787/build/jsfeat.js"></script>
   <script type="text/javascript">
   var cols,rows,data_type;
   var my_matrix=new jsfeat.matrix_t(cols,rows,data_type);

   alert("2");
   </script>

Expecting to execute 1 and 2 prompts but only 1 is getting whereas 2 is not.... please help me in accessing it. Is it rightway???