Exponential fitting with complex value in labview 8.2

[nopi]

hello to anybody

i am an student  working on final project

my question is: is there any option  to work with Exponential  fitting  with complex value in labview 8.2 virsion (or labview 8.7 virsion) ?

if  the answer is yes, please give me any exmples or any links in the interent/

thank you 

good day

gad 

[smercurio_fc]

I'm not quite sure what you're trying to do. Are you plotting real vs imaginary, or imaginary vs real, or something else?

[altenbach]

There is no LabVIEW 8.7.

The exponential fitting tools don't accept complex data, however you can use the "plain nonlinear fit" after converting your complex input array to a DBL array of double the size.

Inside the model, you can e.g. do a global fit of the RE and IM components or whatever you need to do. Can you attach a small VI that containst typical data? How many paramteres do you have? Do the RE and IM components have the same exponential constants?

Depending on what you need, you can also fit for the magnitude which is now no longer complex, of course. Just insert "absolute value" before fitting.

We clearly need more information:

• Do you have e.g. an exponential signal that is detected in quadrature, for example?
• Are you thinking about fitting to a complex exponential?

Message Edited by altenbach on 06-07-2009 11:18 AM