showing undefined variable error

idEp(n)=tm*dEq

idp_eff(n)=(K*idEp(n))-(((3*G*K*(M-ny(n)).*dEq)+(-1*K*K*ny(n).*(M-ny(n))*idEp(n)))/((3*G-(K*ny(n).*(M-ny(n))))+(peff(n).*((n_p-ny(n)).^2)./(a*n_p))));

idq(n)=((3*G*dEq)-(((-3*G*K*ny(n).*idEp(n))+(9*G*G*dEq))/((3*G-(K*ny(n).*(M-ny(n))))+(peff(n).*((n_p-ny(n)).^2)./(a*n_p)))));

error: idp_eff is undefined.

Answer 1

[KALYAN ACHARJYA]

Its simple define the variable idp_eff and others too (if any)