# I keep getting the error message that the variables must be of data type double and it is currently of type sym.

4 views (last 30 days)
Ana on 21 Feb 2024
Commented: Ana on 21 Feb 2024
%I'm unsure how else to run this code to solve the 10 eqn system where
syms AB BC AD BD CD DE CE Ax Ay Ey
eqn2=Ay+AB==0;
eqn3=74+BC+(3/5)*BD==0;
eqn4=-AB-(4/5)*BD==0;
eqn5=-BC+(3/5)*CE==0;
eqn6=-24-CD-(4/5)*CE==0;
eqn8=CD+(4/5)*BD==0;
eqn9=-DE-(3/5)*CE==0;
eqn10=Ey+(4/5)*CE==0;
[AB BC AD BD CD DE CE Ax Ay Ey]=solve(eqn1, eqn2, eqn3, eqn4, eqn5, eqn6, eqn7, eqn8, eqn9, eqn10,[AB BC AD BD CD DE CE Ax Ay Ey])
AB =
BC =
74
BD =
CD =
DE =
46
CE =
Ax =
Ay =
Ey =
Walter Roberson on 21 Feb 2024
Edited: Walter Roberson on 21 Feb 2024
The code works properly here.
Try
restoredefaultpath; rehash toolboxcache
Ana on 21 Feb 2024
it is still giving me these error messages
"Variable AB must be of data type double. It is currently of type sym. Check where the variable is assigned a value."
is it because I introduce them using 'syms', it also said i cannot use rehash in my code on Matlab Grader

Walter Roberson on 21 Feb 2024
%I'm unsure how else to run this code to solve the 10 eqn system where
syms AB BC AD BD CD DE CE Ax Ay Ey
eqn2=Ay+AB==0;
eqn3=74+BC+(3/5)*BD==0;
eqn4=-AB-(4/5)*BD==0;
eqn5=-BC+(3/5)*CE==0;
eqn6=-24-CD-(4/5)*CE==0;
eqn8=CD+(4/5)*BD==0;
eqn9=-DE-(3/5)*CE==0;
eqn10=Ey+(4/5)*CE==0;
[AB BC AD BD CD DE CE Ax Ay Ey]=solve(eqn1, eqn2, eqn3, eqn4, eqn5, eqn6, eqn7, eqn8, eqn9, eqn10,[AB BC AD BD CD DE CE Ax Ay Ey]);
AB = double(AB);
BC = double(BC);
BD = double(BD);
DE = double(DE);
CE = double(CE);
Ax = double(Ax);
Ay = double(Ay);
Ey = double(Ey);
Ana on 21 Feb 2024
that worked perfectly thank you so much!