The operator SS is no longer defined in an earlier section? I suspect it has been renamed as SCS? SCS=: 1 : 0 (([EMAIL PROTECTED] - [EMAIL PROTECTED]) % [) "0 )
_____ (23 of 25) DERIVATIVE (ctd) ____________________________ We will test this derivative of the function f=: c&p. in two ways; first by applying the first derivative operator D.1 to f, and secondly by comparing the derivative with the secant slope obtained from the operator SS of an earlier section. Thus: ) f=: 3 1 4 2 & p. f D.1 x 1 0 0 0 0 0 0 0 0 15 0 0 0 0 0 0 0 0 41 0 0 0 0 0 0 0 0 79 0 0 0 0 0 0 0 0 129 0 0 0 0 0 0 0 0 191 0 0 0 0 0 0 0 0 265 0 0 0 0 0 0 0 0 351 0.01 c&p. SS x |value error: SS | 0.01 c&p. SS x ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
