Event function in ODE45

Hi, I have to create an event function for ode45 that terminate the integration as the quantity say x,becomes grater than 0. I know how to write it for x=0. but for x>0 or x<0, i could not figure out. Please help me out for this.

Regards Sunit

Answer 1

[Star Strider]

Under ‘Event Location’ the options are:

• -1 Detect zero crossings in the negative direction only
• 0 Detect all zero crossings
• 1 Detect zero crossings in the positive direction only

So it would seem that the +1 option would be what you want.