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

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Kseniia Kudriavtceva 2020-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/654228-invalid-expression-when-calling-a-function-or-indexing-a-variable-use-parentheses-otherwise-chec

评论： Kseniia Kudriavtceva 2020-11-20

采纳的回答： Setsuna Yuuki.

在 MATLAB Online 中打开

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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Answer 1

Setsuna Yuuki. 2020-11-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/654228-invalid-expression-when-calling-a-function-or-indexing-a-variable-use-parentheses-otherwise-chec#answer_550613

编辑：Setsuna Yuuki. 2020-11-20

在 MATLAB Online 中打开

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)