The Origin Forum

File Exchange

Try Origin for Free

The Origin Forum

All Forums

Origin Forum for Programming

LabTalk Forum

Any way to find peaks not on graph basis?

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Screensize:

UserName:

Password:

Anti-Spam Code:

Format Mode:

Format:

Message:

* HTML is OFF
* Forum Code is ON

Smilies

Check here to include your profile signature.
Check here to subscribe to this topic.

T O P I C R E V I E W
adamleewiner	Posted - 07/30/2008 : 6:11:28 PM Hello, How to find peaks from datasets or columes rather than from a graph, I mean the input data is from a workbook without a graph existing. An USTCer always keep trying.
2 L A T E S T R E P L I E S (Newest First)
adamleewiner	Posted - 07/31/2008 : 07:59:34 AM Thanks for you reply, Deanna. However, I think I have to first plot a graph and then pkfind to get what I want. Origin is becoming more and more powerful. quote: Originally posted by Deanna Hi, If you are using Orign SR2 (the latest patch), you can use the pkfind X-Function to find peaks from datasets/columns/ranges. Below is an example of importing spectrum data and finding peaks in it. //Import spectrum data with 7 peaks string fname$=system.path.program$ + "Samples\Spectroscopy\HiddenPeaks.dat"; newbook sheet:=0; newsheet cols:=5 labels:="Time\|Spectrum Data\|Peak Center Indices\|Peak Center X\|Peak Center Y"; impASC; string bkn$=%H; //Find peak centers pkFind iy:=col(2) method:=second ocenter:=col(3) oleft:=<none> oright:=<none> ; //Find peak center positions by their indeces col(4)=col(1)[col(3)]; //X positions col(5)=col(2)[col(3)]; //Y positions //Plot spetrum data as a black line plotxy iy:=col(2) plot:=200; //Plot peak centers as red scatters plotxy iy:=[bkn$]1!(4,5) plot:=201 legend:=1 color:=2 ogl:=1!; Deanna OriginLab Technical Services An USTCer always keep trying.
Deanna	Posted - 07/30/2008 : 11:53:02 PM Hi, If you are using Orign SR2 (the latest patch), you can use the pkfind X-Function to find peaks from datasets/columns/ranges. Below is an example of importing spectrum data and finding peaks in it. //Import spectrum data with 7 peaks string fname$=system.path.program$ + "Samples\Spectroscopy\HiddenPeaks.dat"; newbook sheet:=0; newsheet cols:=5 labels:="Time\|Spectrum Data\|Peak Center Indices\|Peak Center X\|Peak Center Y"; impASC; string bkn$=%H; //Find peak centers pkFind iy:=col(2) method:=second ocenter:=col(3) oleft:=<none> oright:=<none> ; //Find peak center positions by their indeces col(4)=col(1)[col(3)]; //X positions col(5)=col(2)[col(3)]; //Y positions //Plot spetrum data as a black line plotxy iy:=col(2) plot:=200; //Plot peak centers as red scatters plotxy iy:=[bkn$]1!(4,5) plot:=201 legend:=1 color:=2 ogl:=1!; Deanna OriginLab Technical Services

The Origin Forum

Snitz Forums 2000