1. Feb 3, 2015 #1

   MattF1

   

   I have
   
   J - matrix
   x and y - vector
   
   d [ J(x) y(x)] / dx
   
   I can multiply the matrix and vector together and then differentiate but I think for my application it would be better to find an identity like
   
   {d [ J(x) y(x)] / dx } = J(x) d y(x) / dx + d J (x) / dx y(x)
   
   I am not sure if this identity is right though?
   
   Any help appreciated

    

   MattF1, Feb 3, 2015
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3. Feb 3, 2015 #2

   Orodruin

   

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   Yes, you can use the product rule just as you did.

    

   Orodruin, Feb 3, 2015

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