Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

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Kseniia Kudriavtceva
评论： Kseniia Kudriavtceva 2020-11-20
So I have an equation and I need to plot as a function of theta, but something isn't working
% Given
syms theta;
R = 20;
L = 80;
H = 38;
theta_1a = 104.720;
% Equation for the velocity of the slider
V_Ba = (theta_1a*R*((cos(theta)-sin(theta)*(H-R*cos(theta))/sqrt(L^2-(H-R*cos(theta))^2)));
% Plot V_B for t between 0 and 2*pi
fplot(V_Ba, [0, 2*pi], 'Linewidth',2)
IDK what's wrong(
Thank you in advance

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采纳的回答

Setsuna Yuuki.
Setsuna Yuuki. 2020-11-20
编辑：Setsuna Yuuki. 2020-11-20
you should add a parenthesis in V_Ba
% Given
syms theta;
R = 20;
L = 80;
H = 38;
theta_1a = 104.720;
% Equation for the velocity of the slider
V_Ba = (theta_1a*R*((cos(theta)-sin(theta)*(H-R*cos(theta))/sqrt(L^2-(H-R*cos(theta))^2)))); %% add one )
% Plot V_B for t between 0 and 2*pi
fplot(V_Ba, [0, 2*pi], 'Linewidth',2)

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