 Usage:  mu = glmlink(code,eta{,opt})  
 
 Input:

  code                   text string, the short code for the model (e.g. 
                         "bilo" for logit or "noid" for ordinary PLM). 
                         
  eta                    n x d matrix, the index values. 
                         
  opt                    optional, a list with optional input. The macro 
                         "glmopt" can be used to set up this parameter. 
                         
  opt.pow                optional, power for power link. If not given, set 
                         to 0 (logarithm). 
                         
  opt.nbk                scalar, extra parameter k for negative binomial 
                         distribution. If not given, set to 1 (geometric 
                         distribution). 
                         
 Output:

  mu                     n x d matrix, the link function applied to eta. 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
