I want to find the integers in a vector of floating point numbers, by generating a boolean marking vector indicating the locations of the integers in the floating-point vector:
Generate a vector of integers & store in a, and generate a second vector of floating and integer numbers by taking the square root of a: b =. %: a=. 1+i.20 Create an integer-finding/marking verb: fi =. 3 :'(<.y)=y' Use 'fi' to find the integers in b: fi b 1 0 0 1 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 Use the mark vector to find the perfect squares in a, by finding the integers in b: a#~ fi b 1 4 9 16 My question is: What are some tacit ways to implement the fi verb? Skip ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
