lsode gives wrong results!

[shm]

Hello,

I trying to solve a simple equation:
xdot= (-0.40770 *(x))+ 57.947;

when i call this xdot function in lsode:
y = lsode (@ ex, x0, t); ## ex is the file name in which function is written
then plot(t,y)

I expect the result in which graph will start from 57.947 then gradually
decays. but instead it starts from 0 and continues to grow until carrying
capacity.

Can any body tell me about my mistake?



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