Skip to main content
mesipa1-Visitor
1-Visitor
January 20, 2012
Question

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

Hello,

I have a function like this:

Eqn.bmp

The Plot of this function looks like this:

Graph.bmp

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.

16 replies

wayne12-Amethyst
12-Amethyst
January 20, 2012

Here is one way

Translate
    mesipa1-VisitorAuthor
    1-Visitor
    January 20, 2012

    Thank you very much for your valuable response

    Translate
    Fred_Kohlhepp23-Emerald I
    23-Emerald I
    January 20, 2012

    Once again, brute force!

    Translate
      mesipa1-VisitorAuthor
      1-Visitor
      January 20, 2012

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

      Translate
      wayne12-Amethyst
      12-Amethyst
      January 20, 2012

      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.

      Translate
      wayne12-Amethyst
      12-Amethyst
      January 22, 2012

      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.

      Translate
      MikeArmstrong1-Visitor
      1-Visitor
      January 23, 2012

      Here is a worksheet which has been passed in the forum several times.

      Mike

      Translate
      wayne12-Amethyst
      12-Amethyst
      January 23, 2012

      Thanks Mike.

      Translate
      Terms & ConditionsAccessibility statement