Plotting a symbolic function using linspace?

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Salman Salamn 2019-10-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/483531-plotting-a-symbolic-function-using-linspace

编辑： Karan Nandankar 2021-1-5

Hi,

I am trying to plot the unit tangent,unit normal , and binormal vectors. However, I keep receiving the same error over and over again. Could you please tell me where I missed up?

Error in sym/privsubsasgn (line 1085)

L_tilde2 = builtin('subsasgn',L_tilde,struct('type','()','subs',{varargin}),R_tilde);

Error in sym/subsasgn (line 922)

C = privsubsasgn(L,R,inds{:});

Error in Calc_3_Prob_7 (line 12)

T(t)= UnitTangent(R);

clear 
clc
close
syms t 
R = [ 10*sin(t)+5*sin(5*t)+2.5*sin(2.3*t), 10*cos(t)+5*cos(5*t)+2.5*cos(2.3*t), 0.001*t.^4.*(1+(cos(2*pi*t)).^2)]; 
T(t)= UnitTangent(R); 
N(t)= Normal(R); 
B(t)= cross(T(t),N(t)); 
 % showing the general acc lies in the osculating plane.( Binormal
 % Direction)
 UB(t)= B./VecSum(B); 
% plot
M(t)=R; 
t= linspace(0,10,601);
 
% plot(t,M(t)) 
plot(t,T(t))
hold on
plot(t,N(t))
plot(t,B(t))
for i=1:length(t)
    plot(t,UB(i), 'k')
    
end 
 
 
 hold off