Symbolic matlab: how to set a variable as a function of time?
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Hello to all! I'm trying to set a symbolic variable as a function of "t". This is because I need to obtain something like this:
K>> diff(sin(theta),t)
ans = diff(theta,t)*cos(theta)
or
ans= theta_dot*cos(theta)
but how to tell Matlab that variable theta is a function of time "t"?
Thank you!
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回答(4 个)
Walter Roberson
2012-2-15
syms theta t
diff(sin(theta(t)),t)
2 个评论
Walter Roberson
2017-4-19
In newer versions of MATLAB, you can use
syms theta(t)
diff(sin(theta),t)
Sergei Sergienko
2020-6-13
Is it possible to make vector function of t? Something like this
sym('q(t)', [3 1])
diff(sin(q),t)
Wayne King
2012-2-15
Hi Sebastian, do you know the expression for theta(t)?
syms theta t;
theta(t) = t^2;
diff(cos(theta),t)
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Sebastian D'Amico
2012-2-15
1 个评论
Wayne King
2012-2-15
Do you really need that if you do not know the expression for theta(t), you know df(theta)/dt = df/dtheta*dtheta/dt
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