I have a black-box function of 3-variables : f=f(x,y,z).
I would like to define with symbolic the relation of ‘f’ with ‘x’,’y’ and ‘z’, as the abstract type of mathematics ‘f=f(x,y,z)’.

In example, I want to do something like:

syms x y z;
_I do not know how to set the symbolic at command line : f=f(x,y,z);

g = x * f + y * f^2 + z;
jacobian( g, [x,y,z])

_and the expected result will be :_

( f + x*(df/dx) + 2*y*f*(df/dx), x*(df/dy) + f^2 + 2*y*f*(df/dy),
x*(df/dz) + 2*y*f*(df/dz) + 1)

Thanks.I have a black-box function of 3-variables : f=f(x,y,z).
I would like to define with symbolic the relation of ‘f’ with ‘x’,’y’ and ‘z’, as the abstract type of mathematics ‘f=f(x,y,z)’.

In example, I want to do something like:

syms x y z;
_I do not know how to set the symbolic at command line : f=f(x,y,z);

g = x * f + y * f^2 + z;
jacobian( g, [x,y,z])

_and the expected result will be :_

( f + x*(df/dx) + 2*y*f*(df/dx), x*(df/dy) + f^2 + 2*y*f*(df/dy),
x*(df/dz) + 2*y*f*(df/dz) + 1)

Thanks. I have a black-box function of 3-variables : f=f(x,y,z).
I would like to define with symbolic the relation of ‘f’ with ‘x’,’y’ and ‘z’, as the abstract type of mathematics ‘f=f(x,y,z)’.

In example, I want to do something like:

syms x y z;
_I do not know how to set the symbolic at command line : f=f(x,y,z);

g = x * f + y * f^2 + z;
jacobian( g, [x,y,z])

_and the expected result will be :_

( f + x*(df/dx) + 2*y*f*(df/dx), x*(df/dy) + f^2 + 2*y*f*(df/dy),
x*(df/dz) + 2*y*f*(df/dz) + 1)

Thanks. symbolic MATLAB Answers — New Questions

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