maxLik package

I don't understand.  The help page for "maxLik" says that if the 
"grad" argument is 'NULL', "numeric gradient will be used." 


      If this does not answer your question, please read the posting 
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      Hope this helps. 
      Spencer Graves

Hi all. 
Recently i have been used maxlik package for optimizing a function with 5 parameters but i couldn't define gradient argument in function maxLik; 

How i can define a command to receive my goal? Whether I can change the core of this package?
 
Thanks for your attention and reply
A. kheradmandi


      
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