how to rectify the below error..

Here i tried simple ordinary differential equation problem...i got an error..

Please anyone solve my query..and point out my mistakes..

i have attached my code also...

Thank you..

Answer 1

[KSSV]

You need to have the function cheb.m, which you can download from:

https://people.maths.ox.ac.uk/trefethen/cheb.m

and then you need to change this line:

A=D^3+0+a2*D+a3*I;

to

A=D.^3+0+a2.*D+a3.*I;

[Priya M]

sir ,having same error again..