Matrix with differential operators - HELP

Question

rodrigo 2013-10-9

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回答： Lam Nguyen Van 2021-2-24

Hello all,

I need some help of you!

I have a matrix of deferential operators (like the image in attachment) and i want to write it in a Matlab notation in order to multiply it with a matrix of functions.

Anyone can help me ?

Thanks in advance

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Answer 1

Azzi Abdelmalek 2013-10-9

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https://ww2.mathworks.cn/matlabcentral/answers/89731-matrix-with-differential-operators-help#answer_99167

在 MATLAB Online 中打开

%Example

syms x y
f=@(h) [diff(h,y) diff(h,x);diff(h,x) -diff(h,y)]
h=2*x+3*y
f(h)

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Azzi Abdelmalek 2013-10-9

在 MATLAB Online 中打开

Maybe this is what you want

syms x y
f=@(h) [diff(h(1,1),y) diff(h(1,2),x);diff(h(2,1),x) -diff(h(2,2),y)]
h=[2*x+3*y 5*x+6*y;10*x+30*y 22*x-y]
f(h)

rodrigo 2013-10-9

More or less.

I have the matrix "h" with variable size. because that i have to multiply the operators matrix with expressions matrix, and not what that.

Any idea ?

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Answer 2

rodrigo 2013-10-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/89731-matrix-with-differential-operators-help#answer_99227

Anyone can help me please ? Azzi's idea did not work for what want.

Thanks

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Cedric 2013-10-16

编辑：Cedric 2013-10-16

What you want to achieve is still unclear to me. Do you need an "operator" which returns the analytical form of this matrix when applied to a function defined analytically/symbolically, or is it numeric?

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