errors

function dedt = markov_ode(t, P) lam = lambda(t) ; dedt = zeros(8,1); dedt (1) = -3 * 1am * P(1); Unrecognized function or variable 'lambda' . dedt (2) = 1am * P(1) - 2 * 1am * P(2); Error in untitled2markov_ode (line 11) dedt(3) = 1am * P(1) - 2 * 1am * P(3) ; lam = lambda(t) ; dedt (4) = 1am * P(1) - 2 * 1am * P(4); AAAAAAAAAAAAAAAA dedt (5) = 1am * P(2) + lam * P(3) - lam * P(5); Error in odearguments (line 93) dedt(6) = 1am * P(2) + 1am * P(4) - lam * P(6); f0 = ode(t0, y0, args{:}); dedt (7) = 1am * P(3) + lam * P(4) - 1am * P(7); Error in ode45 (line 104) dedt (8) = 1am * P(5) + 1am * P(6) + lam * P(7); odearguments ( odeIsFuncHandle, odeTreatAsMFile, end Explain Error [t, P] = ode45(@markov_ode, t, PO)