Plotting a symbolic function using linspace?

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

[Walter Roberson]

Unrecognized function or variable 'UnitTangent'.

[Salman Salamn]

I am sorry didn't clarify above, but UnitTangent(), and Normal() are functions I made in MatLab. So I dont think that is the problem.

[Walter Roberson]

The error message suggests that UnitTangent is a variable at that point (and not one that is a file handle.)

[Karan Nandankar]

Hi,

Can you share the code of function 'UnitTangent()', so that I can reproduce the error at my end.