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I am trying to make a function like Norm but defined like so: MyNorm[{x_,y_,z_}]=Sqrt[x^2+y^2+z^2]. Mathematica assumes that x, y, and z are constants, and gives MyNorm'[{x,y,z}] to be 0 for any x, y, or z. This would be fine, except that my x, y, and z will be functions of t, and I would like MyNorm'[{x,y,z}] to be equal to $$\frac{d}{dt} MyNorm(x(t),y(t),z(t))$$

of course I actually mean MyNorm[{x,y,z}].

Does anyone know how to do this?

I am trying to make a function like Norm but defined like so: MyNorm[{x_,y_,z_}]=Sqrt[x^2+y^2+z^2]. Mathematica assumes that x, y, and z are constants, and gives MyNorm'[{x,y,z}] to be 0 for any x, y, or z. This would be fine, except that my x, y, and z will be functions of t, and I would like MyNorm'[{x,y,z}] to be equal to $$\frac{\mathrm d}{\mathrm dt} \mathtt{MyNorm[\{}x(t),y(t),z(t)\mathtt{\}]}$$

Does anyone know how to do this?

I am a real noob to mathematica... I am trying to make a function like Norm but defined like so: MyNorm[{x_,y_,z_}]=Sqrt[x^2+y^2+z^2]. Mathematica assumes that x, y, and z are constants, and gives MyNorm'[{x,y,z}] to be 0 for any x, y, or z. This would be fine, except that my x, y, and z will be functions of t, and I would like MyNorm'[{x,y,z}] to be equal to $$\frac{d}{dt} MyNorm(x(t),y(t),z(t))$$

of course I actually mean MyNorm[{x,y,z}].

Does anyone know how to do this?

I am trying to make a function like Norm but defined like so: MyNorm[{x_,y_,z_}]=Sqrt[x^2+y^2+z^2]. Mathematica assumes that x, y, and z are constants, and gives MyNorm'[{x,y,z}] to be 0 for any x, y, or z. This would be fine, except that my x, y, and z will be functions of t, and I would like MyNorm'[{x,y,z}] to be equal to $$\frac{d}{dt} MyNorm(x(t),y(t),z(t))$$

of course I actually mean MyNorm[{x,y,z}].

Does anyone know how to do this?