Graphing noise (mathematica)

  • Mathematica
  • Thread starter stunner5000pt
  • Start date
  • #1
1,444
2
For my time series and spectral analysis class i need to graph something like in the attachment. i need to have 100 numbers that are connected like that, and then 'add' them to a sinusiodal wave to create a real life wave - with noise.

How would i do this using mathematica??

I can easily generate a whole bunch of random numbers with ranging values but how would i make it such taht all the numbers are in ascending order and go from 0 to at least 2 pi?

would i use numerous Random[x] and then arrange them (how?) in ascending order??

Please help!!

Thank you in advance for your input
 

Attachments

  • noise.JPG
    noise.JPG
    7.1 KB · Views: 312

Answers and Replies

  • #2
1,444
2
any ideas people??

graphing random numbers and then 'joinging' them seems to be a good idea here... is that possible with mathematica though?
 
  • #3
Look up the function Sort.

Sort[Real,{1.13,2.14,1.54,2.61}]

{1.13,1.54,2.14,2.61}
 
  • #4
chroot
Staff Emeritus
Science Advisor
Gold Member
10,226
36
I have no idea what you mean, ascending order. From what I can tell, there's no correlation between the time and the value, which is rather the definition of a random variable. You're not going to add the random values to the angles going into the sine function -- you're going to add them to the outputs coming from the sine function.

Just compute a table of sine values, one for each point of interest. Next, add a random value to each entry in the table.

- Warren
 
  • #5
1,444
2
chroot said:
I have no idea what you mean, ascending order. From what I can tell, there's no correlation between the time and the value, which is rather the definition of a random variable. You're not going to add the random values to the angles going into the sine function -- you're going to add them to the outputs coming from the sine function.

Just compute a table of sine values, one for each point of interest. Next, add a random value to each entry in the table.

- Warren

now why didnt i think of it that way

in fact tahts what my prof said too

im just silly

thanks a lot :biggrin:
 

Related Threads on Graphing noise (mathematica)

Replies
2
Views
4K
Replies
4
Views
8K
Replies
0
Views
2K
  • Last Post
Replies
3
Views
4K
Replies
3
Views
9K
Replies
1
Views
4K
Replies
2
Views
4K
Replies
1
Views
2K
Replies
1
Views
3K
Top