[R] Stuck using constrOptim

dre968 alyalko at gmail.com
Thu Apr 23 23:36:49 CEST 2009


so i set gr=Null:
> constrOptim(p0,minsquare,Y=Y,Z=Z,NULL,gr=NULL,ui=A,ci=B,method="BFGS")
and i recieved the following error:
Error in optim(theta.old, fun, gradient, control = control, method = method, 
: 
  objective function in optim evaluates to length 0 not 1
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