Faster, faster!
J provides a compiling variant of function definition which yields a function which does not required to be parsed at each execution. IMC=. 13 : '(y,y)$(1+y){.1' IMC 2 1 0 0 1 Because IMC need not be parsed, it execution time may be significantly faster than the conventional form. 100 time 'IM 100' 0.0113333 100 time 'IMC 100' 0.005 |