       Re: derivative of matrix in mathematica

• To: mathgroup at smc.vnet.net
• Subject: [mg120149] Re: derivative of matrix in mathematica
• From: "W. Craig Carter" <ccarter at mit.edu>
• Date: Sun, 10 Jul 2011 05:00:33 -0400 (EDT)
• References: <201107091132.HAA13492@smc.vnet.net>

```Hello Yashar,
Here is an example:
5x5 where each element is a function of t

fiveByfive = Array[matrixFuncs[#1, #2][t] &, {5, 5}]

The derivative of the matrix with respect to t
fiveByfive = Array[matrixFuncs[#1, #2][t] &, {5, 5}]

I am not sure what you are asking for with your third question, but perhaps this gives you a direction:

anotherfiveByfive = Array[otherFuncs[#1, #2][t] &, {5, 5}]
Table[fiveByfive[[i, j]] == anotherfiveByfive[[i, j]], {i, 5}, {j, 5}]

On 9 Jul,   2011, at 7:32 AM, yashar wrote:

> hi
> in mathematica
> how i can produce a general n by n matrix so that each of its elements be a variable of t???
> how i can take derivative of this matrix with respect to variable t?
> how i can with equating this n by n matrix with another n by n matrix which its elements are known obtain unknown elements of this general n by n matrix?
>

```

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