How to find Maximum Value of Sine function over a range of time.

Forum|Forum|14 years ago
January 20, 2012
3 replies
11574 views

Hello,

I have a function like this:

The Plot of this function looks like this:

I want to find the maximum value of this function within time range of t= 0 sec to 0.1 sec. If I put initial guess of 0.03 s the maximize function gives the maximum value within the cycle at 0.03s. How do I find maximum of different cycles within a range. Any help is appreciated very much. I have attached my work sheet here.

1_FCF-Calculation-xmcd.zip

Other

W

wayne

12-Amethyst

Here is one way

1_FCF-Calculation-xmcd.zip

M

mesipa

Author

1-Visitor

Thank you very much for your valuable response

F

Fred_Kohlhepp

23-Emerald I

Once again, brute force!

1_FCF-Calculation-max-xmcd.zip

M

mesipa

Author

1-Visitor

I Thank you very very much, This one is much more shorter than previous. Appreciate it.

W

wayne

12-Amethyst

Fred's is nice, I agree.

But it's not actually shorter. You must manually step to find the peaks, or you might miss one. Also, If you want the max absolute value, then you must add to the program and have even more steps.

If all you want is the maximum positive value, then creating a vector of values,v and using the max(v) is as short as you get and does not require any manual intervention.

But, depends how much information and how automated you want.

W

wayne

12-Amethyst

I spent a little more time and extended to find all of the roots and the local extrema between the roots, and the locations. But once the functions have been defined, only have two functions, one for zeros and one for local extrema.

1_FCF-Calculation-xmcd.zip