Thread Subject: finding peaks and base of peaks

hi, im trying to figure out how to find the peaks and begining and end of the peaks from just data points given to be graphed..

i want be able to store these peaks as variables and use their position

 anyone know how to do this??

"vince mancuso" <vinmania99@yahoo.com> wrote in message <gvk0i0$555$1@fred.mathworks.com>...
> hi, im trying to figure out how to find the peaks and begining and end of the peaks from just data points given to be graphed..
>
> i want be able to store these peaks as variables and use their position
>
> anyone know how to do this??

% Download and try extrema from the MATLAB FEX at:

http://www.mathworks.com/matlabcentral/fileexchange/12275

There is a FINDPEAKS command in Signal Processing Toolbox that might be
useful.

Rajiv


"vince mancuso" <vinmania99@yahoo.com> wrote in message
news:gvk0i0$555$1@fred.mathworks.com...
> hi, im trying to figure out how to find the peaks and begining and end of
> the peaks from just data points given to be graphed..
>
> i want be able to store these peaks as variables and use their position
>
> anyone know how to do this??

"vince mancuso" <vinmania99@yahoo.com> wrote in message <gvk0i0$555$1@fred.mathworks.com>...
> hi, im trying to figure out how to find the peaks and begining and end of the peaks from just data points given to be graphed..
>
> i want be able to store these peaks as variables and use their position
>
> anyone know how to do this??

learn how to program and use steepest descent.

"someone" <someone@somewhere.net> wrote in message <gvk1ut$5p2$1@fred.mathworks.com>...
> "vince mancuso" <vinmania99@yahoo.com> wrote in message <gvk0i0$555$1@fred.mathworks.com>...
> > hi, im trying to figure out how to find the peaks and begining and end of the peaks from just data points given to be graphed..
> >
> > i want be able to store these peaks as variables and use their position
> >
> > anyone know how to do this??
>
> % Download and try extrema from the MATLAB FEX at:
>
> http://www.mathworks.com/matlabcentral/fileexchange/12275

hey someone...

 im not sure if you know this, but my graph has many peaks, is their a way to just get the ones that are the biggest? also, can u store these as variables?

Can you simply use max and min functions? They can return the value and/or the index of that value.

-Dan

> hey someone...
>
> im not sure if you know this, but my graph has many peaks, is their a way to just get the ones that are the biggest? also, can u store these as variables?

"Daniel " <djs32@buffalo.edu> wrote in message <gvm9nq$b5h$1@fred.mathworks.com>...
> Can you simply use max and min functions? They can return the value and/or the index of that value.
>
> -Dan
>
> > hey someone...
> >
> > im not sure if you know this, but my graph has many peaks, is their a way to just get the ones that are the biggest? also, can u store these as variables?


Dan, i was just trying that.. i can find the peaks, do you know anyway to find where the begging and ending point of that peak's base ?

"vince mancuso" <vinmania99@yahoo.com> wrote in message <gvm8u2$fg6$1@fred.mathworks.com>...
> "someone" <someone@somewhere.net> wrote in message <gvk1ut$5p2$1@fred.mathworks.com>...
> > "vince mancuso" <vinmania99@yahoo.com> wrote in message <gvk0i0$555$1@fred.mathworks.com>...
> > > hi, im trying to figure out how to find the peaks and begining and end of the peaks from just data points given to be graphed..
> > >
> > > i want be able to store these peaks as variables and use their position
> > >
> > > anyone know how to do this??
> >
> > % Download and try extrema from the MATLAB FEX at:
> >
> > http://www.mathworks.com/matlabcentral/fileexchange/12275
>
> hey someone...
>
> im not sure if you know this, but my graph has many peaks, is their a way to just get the ones that are the biggest?

FYI, there can only be ONE biggest.

 also, can u store these as variables?

Did you even bother to look at extrema?

It does EXACTLY waht you descrbe you want to do!

You should try
http://www.mathworks.com/access/helpdesk/help/toolbox/bioinfo/index.html?/access/helpdesk/help/toolbox/bioinfo/ref/mspeaks.m
Algorithm is robust against noisy data, oversegmentation and poor peak resolution. The core of the algorithm uses wavelet denoising.
Lucio

"vince mancuso" <vinmania99@yahoo.com> wrote in message <gvk0i0$555$1@fred.mathworks.com>...
> hi, im trying to figure out how to find the peaks and begining and end of the peaks from just data points given to be graphed..
>
> i want be able to store these peaks as variables and use their position
>
> anyone know how to do this??

On May 28, 12:24 pm, "Lucio Cetto" <lce...@nospam.mathworks.com>
wrote:
> You should tryhttp://www.mathworks.com/access/helpdesk/help/toolbox/bioinfo/index.h...
> Algorithm is robust against noisy data, oversegmentation and poor peak resolution. The core of the algorithm uses wavelet denoising.
> Lucio
---------------------------------------------
That link is broken.

Sorry, I meant
http://www.mathworks.com/access/helpdesk/help/toolbox/bioinfo/ref/mspeaks.html
Lucio

ImageAnalyst <imageanalyst@mailinator.com> wrote in message <6c1fcd3e-ba51-40ce-a384-93f510278ad3@j32g2000yqh.googlegroups.com>...
> On May 28, 12:24?pm, "Lucio Cetto" <lce...@nospam.mathworks.com>
> wrote:
> > You should tryhttp://www.mathworks.com/access/helpdesk/help/toolbox/bioinfo/index.h...
> > Algorithm is robust against noisy data, oversegmentation and poor peak resolution. The core of the algorithm uses wavelet denoising.
> > Lucio
> ---------------------------------------------
> That link is broken.