Hi Don, Are you looking for
y=:5 c=:(*=)&i. c y 0 0 0 0 0 0 1 0 0 0 0 0 2 0 0 0 0 0 3 0 0 0 0 0 4 Cheers, bob On 2012-11-18, at 7:13 PM, Don & Cathy Kelly wrote: > OOPs' I meant y=:i.5 5 > > Don > On 18/11/2012 7:04 PM, Don & Cathy Kelly wrote: >> That gives the diagonal nicely but the problem that I didn't express >> clearly is that I want a matrix as follows >> y=:i.5 >> >> ]result =: (* =@i.@#) y >> 0 0 0 0 0 >> 0 1 0 0 0 >> 0 0 2 0 0 >> 0 0 0 3 0 >> 0 0 0 0 4 >> which II can get by >> c=:* =@i.@# >> c y >> 0 0 0 0 0 >> 0 1 0 0 0 >> 0 0 2 0 0 >> 0 0 0 3 0 >> 0 0 0 0 4 >> >> For my purposes I can use a base nth order unit matrix by the phrase as >> given in phrases as m=:=@i.@# y >> and then deal with m* y1 , m* y2 etc which suits my purpose which is to form >> a specific Jacobean used for power system load flows. >> I have handled this problem in APL and am trying to replicate the coding >> more directly in J-mainly as an exploration of J for my own satisfaction. >> >> Thank you >> >> Don Kelly > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
