Partial differentiation-Multiple syms derivative x and y

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vu ngothanh
vu ngothanh 2015-4-14
评论： vu ngothanh 2015-4-14
I have a eq. like this y=cosh(L*x)*cos(L*y) (1)
What is the code that I must do if I want to have a result like this: y'=L*x'*sinh(L*x)*cos(L*y)-L*y'*sin(L*y)*cosh(L*x) (2)
I just need a eq.2. I don't know how to call the caculation from 1-2. Sorry about it. Thanks in advance.

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采纳的回答

Torsten
Torsten 2015-4-14
syms t, L
x = sym('x(t)'); % x(t)
y = sym('y(t)'); % y(t)
E1 = diff(y);
E2 = cosh(L*x)*cos(L*y);
E3 = diff(E2,t);
pretty(E1)
pretty(E3)
Best wíshes
Torsten.
  1 个评论
vu ngothanh
vu ngothanh 2015-4-14
Dear Mr. Torsten, Why you put E1 in your code. I don't understand about it. If I remove it, it still give a same result. Thank you

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更多回答（3 个）

Torsten
Torsten 2015-4-14
vu ngothanh
vu ngothanh 2015-4-14
Thank you for your help. But, your link just solved the diff of x, while I need diff in both x and y. Can you help me again. Thanks a lot
vu ngothanh
vu ngothanh 2015-4-14
Thanks you very much.

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