What did I do wrong here

clc, clear
T=[cosd(48.81) 1 0 0 0 0 0 0 0;
    0 -1 0 0 cosd(48.81) 1 0 0 0;
    0 0 1 0 sind(48.81) 0 0 0 0;
    -cosd(48.81) 0 0 1 0 0 0 0 0;
   -sin(48.81) 0 -1 0 0 0 0 0 0;
    0 0 0 -1 -cosd(48.81) 0 0 0 0;
    0 0 0 0 -sind(48.81) 0 -1 0 -sind(45);
    0 0 0 0 0 0 0 0 sind(45);
    0 0 0 0 0 0 0 -1 -cosd(45)];
 A=[0; 0; 0; 0; 1800; 1200; 0; 1500; 0];
 N1=1:9;
 F=T\A;
 tbl=[N;F'];
 disp(' Member    Force')
 disp('   No.     Lbf')
 fprint('    %1i    %7.1f\n',tbl)

Answer 1

[Walter Roberson]

You have

   14-tbl=[N;F'];

but 14-tbl is not a valid variable reference to assign in to.

Perhaps you accidentally copied in the "14-" from a line number in something you were looking at?

[Mutaz Alsomali]

i just but tbl=[N;F']; , is it wron?

[Walter Roberson]

You have not defined a variable named N.

Also note that the correct function name is fprintf()