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MATLAB Central > MATLAB Newsreader > string 2 number 

I am trying to get MATLAB to take derivatives a matrix (Jacobian basically) then after I input the value of the variables into the matrix calculate the result in the matrix. The problem is even though I input the value of the variables, MATLAb does not calculate the equations instead the program just stores the matrix with my equations with the variables inside instead. Here is my code: 
Dear Ender! 
"Jan Simon" <matlab.THIS_YEAR@nMINUSsimon.de> wrote in message <hp27jv$p2p$1@fred.mathworks.com>... 
Dear Ender! 
"Jan Simon" <matlab.THIS_YEAR@nMINUSsimon.de> wrote in message <hp2dt6$ekj$1@fred.mathworks.com>... 
"Ender " <jr147@msstate.edu> wrote in message 
Dear Ender! 

"Steven Lord" <slord@mathworks.com> wrote in message <hp2je7$fsh$1@fred.mathworks.com>... 
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