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## Main Question or Discussion Point

**someone helps me please!!**

Hello all,

This is the first time Ive stumbled across this site, but it appears to be extremely helpful. I am an elettronic engineering grad student, and in my research, I have run across the following 2nd order non linear differential equation. It is of the form:

x'' + x = sinwt + s(x)

where s(x) = abs(5*x+1)-abs(5*x-1) (saturation)

and t=(0 2000)

and w=[0:0.001:2.^0.5] (it's a variable )

My questions are :

1) How can I write and solve this problem using Matlab ?

2) How can I plot this differential equation as a function of w ?

after the plot, How can I find the max Local (Relative) Maxima and put these results in another graph always considering them as a function of w ?

I hope there's someone who helps me...

thanks