Creating and differentiating symbolic functions with vector inputs of different dimensions

Question

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Hi,

I would like to do the following:

1) Define a callable symbolic function F of variables X and Y, where X and Y are vectors of different dimensions.

2) Then, take the Jacobian of F with respect to either X or Y, and not the individual elements of X and Y.

Is there a way to do this?

Thanks! Stephanie

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Walter Roberson 2013-8-25

Vectors of different lengths, or vectors of different dimensions?

Stephanie 2013-8-25

Vectors of different lengths.

Answer 1

Stephanie 2013-8-28

0 个投票

I solved the problem. Here's the solution:

Once we have the function f, we can take its jacobian with the original vectors X and Y to produce another symbolic function.

When calling f, to take its Jacobian for instance:

Put all of the inputs into a row vector.
use num2cell to convert the row vector into a cell array, called "symbolic_input"
Call f: f(symbolic_input{:})