how to get the critical gain and critical period from transfer function 1/s(s+1)(s+5) in matlab?

how to get the critical gain and critical period from transfer function 1/s(s+1)(s+5) in matlab?

and design P, PI and PID controllers using the critical gain and critical period in matlab?

[David Wilson]

Try using margin from the control toolbox.

[Ghulam Mohiyuddin Khalid]

here you go

Answer 1

[Ghulam Mohiyuddin Khalid]

please check attachment.