why i get this error (Undefined function or method 'fptintf' for input arguments of type 'sym'. Error in ==> trying at 34 ;fptintf(fid,' %1.2s\n',r1);)and how to solve it

clear;clc t = input('write the time = ');

s = input('write the time step = ');

L1 = input('first link lenght = ');

L2 = input('second link lenght = ');

L3 = input('third link lenght = ');

m = L1+L2+L3; %the sum of the links lenght

p = t/s ;% the time step

w = m/p; % number of parts for every axies

syms th1 th2 th3

A1 = [cos(th1) -sin(th1) 0 L1*cos(th1) ;

    sin(th1) cos(th1) 0 L1*sin(th1);
    0 0 1 0 ; 0 0 0 1];
A2 = [cos(th2) -sin(th2) 0 L2*cos(th2) ;
    sin(th2) cos(th2) 0 L2*sin(th2);
    0 0 1 0 ; 0 0 0 1];
A3 = [cos(th3) -sin(th3) 0 L3*cos(th3) ;
    sin(th3) cos(th3) 0 L3*sin(th3) ;
    0 0 1 0 ; 0 0 0 1];
fid = fopen('Matlab-Asm1.doc','w');
u = 0;
for q = 0:s:t ;
    px = m-w*u ;py = w*u ;pz = 0;
    M = [0 0 0 px ; 0 0 0 py ; 0 0 1 pz ; 0 0 0 1];
    S = inv(A1)*M;
    r1 = solve(S(2,4),th1);%r1 is th1 
    s1 = subs(S,th1,r1);
    S1 = inv(A2)*s1;
    r2 = solve(S1(2,4),th2);%r2 is th2
    s2 = subs(S1,th2,r2);
    S2 = inv(A3)*s2;
    r3 = solve(S2(2,4),th3);%r3 is th3
    fprintf(fid,'%1.2f',q);fprintf(fid,'   %1.2f',px);fprintf(fid,'   %1.2f',py)...
        ;fptintf(fid,'   %1.2s\n',r1);
    u = u+1;
end

Answer 1

[Elias Gule]

There's a typo in your code. The line before

u = u + 1;

must be changed from

; fptintf(fid,'   %1.2s\n',r1);

to

;fprintf(fid,'   %1.2s\n',r1);