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hi friends, 
At point n, you could find the forward difference or the backward difference or take a secant from n1 to n+1. For example: 
Thanks for response, Matt Fig. 
"Stephen " <mulan_nuri@yahoo.com> wrote in message <gnqcsa$cnb$1@fred.mathworks.com>... 
Subject: tangent line from curve graph From: Roger Stafford Date: 22 Feb, 2009 04:50:18 Message: 5 of 6 
"Stephen " <mulan_nuri@yahoo.com> wrote in message <gnq5ll$bih$1@fred.mathworks.com>... 
Thanks to Matt Fig and Roger Stafford. 
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