how do i change StepTolerance?

Question

KIPROTICH KOSGEY 2019-10-24

评论： KIPROTICH KOSGEY 2019-10-29

Hi,

Please i would like to write a code in matlab that changes the StepTolerance to 1E-20 but i do not know how to go about.

Please can someone assist, please..

This is my script:

y0=[0.02352;0.00048;0.0288;0.00432;0.216;0.1104;0.1104;2;2;2;55;50;0.5];

h=0.0006944444;

tSpan=[0 535];

options = optimoptions('StepTolerance', 1e-20);

[tSol, ySol]=ode23tb(@(t, y) MBBRFun4(t,y), tSpan, y0, options);

as it stands, i get the following error:

Warning: Failure at t=6.848966e-01. Unable to meet integration

tolerances without reducing the step size below the smallest value

allowed (2.433242e-15) at time t.

Thanks in advance

Answer 1

Dinesh Yadav 2019-10-29

Hi,

As I have attached an example code for changing step tolerance. Hope it helps your cause.

KIPROTICH KOSGEY 2019-10-29

Thank you so much!