I have a blind spot in making certain forms tacit. Here is an example, similar to correlation. I have a small vector (probe) and I want to calculate its dot product with subarrays of some data.
data=:(i.4),(i.3),(i.4),(i.5) dot=:+/ .* probe=:i.4 (#probe) probe&dot\ data 14 8 6 8 5 5 8 14 8 6 8 14 20 This is the result I want. I can write an explicit verb f1=:4 : '(#x) x&dot\ y' probe f1 data 14 8 6 8 5 5 8 14 8 6 8 14 20 but I cannot see how to make it tacit. I can rewrite the tacitly verb using polynomial multiplication to give essentially the same result: ppr=:(+//.)@(*/) f2=:|.@:(ppr |.) probe f2 data 0 3 8 14 8 6 8 5 5 8 14 8 6 8 14 20 11 4 0 but I would like to be able to take f1 as is and rewrite it tacitly. Best wishes, John ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
