derivative in syms

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Franco
Franco 2011-10-12
If I am using syms, and i have the following
a = b * u
then da/dt = b * du/dt.
How do I get matlab to do this rather than just assume u is not a function of t and assign a value of 1?

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采纳的回答

Walter Roberson
Walter Roberson 2011-10-12
You tell MATLAB that u is a function of t.
a = subs(a,'u','u(t)');
diff(a,'t')

更多回答（1 个）

William
William 2011-10-12
It looks like you're tying a differential equation
try this link
http://www.mathworks.com/help/techdoc/math/f1-662913.html
  2 个评论
Franco
Franco 2011-10-12
I am, but I need to solve it analytically, not numerically
Bjorn Gustavsson
Bjorn Gustavsson 2011-10-12
Look at 'dsolve' then, that should be what you want to use for solving DE analytically.

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