Hi,

I would like to solve a 4th order ODE : y""-5y"+4y=0, and I tried to use "ode2" and "contrib_ode" to solve it but it seems not work:

ode2 method

de : 'diff(y,x,4)-5*('diff(y,x,2))+4*y;

gsoln : ode2(de, y, x);

msg1

false

contrib_ode method

load(contrib_ode)$

contrib_ode(de,y,x);

false

Can someone help me to solve this question ? thanks!!