How to calculate rise time?

I'm having trouble figuring out how to calculate the rise time for this function this is the code I have but it didn't work, I am supposed to find " |The rise time for this system response is defined as the time it takes for the system to first reach 90% of the steady state response of the system

• Write a section of code which determines the steady state response of the system – and which then uses that information to determine the rise time of the system|

Answer 1

[Ameer Hamza]

According to the names of variables shown in the image, you can find rise time as follow

[~, ind] = find(c > 0.9*ss, 1);
t_rise = t(ind);

t_rise is time when output response c reach 90% of its seeady state value.