Two nonlinear fitting's function in one

We bought the LabView 6.1 and I have no clue
how to make the Lev-Mar work (and many other
functions as well).
There are some tasks in the 'getting start' manual
that tells you step-by-step of doing things.
I appreciate any body can tell me how to 'write'
a Lev-Mar from clicking the first buttom step-by-step.
Anyway, before that, I copied an Lev-Mar example
for my simple task. It works OK. But when I use
two in the same vi, it seems when I change one
function/derivative, it change the other one too.
My question two: How to make 2 or more different
function/derivatives in the same vi?
Thanks.

Hi, Jeremy:
Attached is a made-off example of the problem.
Two set of time-amplitude data are from hardware.
They have to be fitted with differene function.
These two Lev-Mar must be inside one same vi as the
parameters are needed for following processing.
These two Lev-Mar's function/derivatives are
obviously different and must be present in this same
vi file. By clicking on Lev-Mar's Hierarchy >> Diagram
we can see the function nodes for function & Deveritives.
How to 'save' these two different function & Deveritives?
By the way, how to replace the MatLab box into
function node in my attached example?
(It's easy to cange MatLab output variable's type,
but I couldn't change the output variable's type.)
Attachments:
Lev-Mar-Question2.vi ‏99 KB

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Message Edited by mdwuznik on 01-29-2009 01:07 AM
Solved!
Go to Solution.
Attachments:
LM_erf_model.vi ‏121 KB
marquardt_test.vi ‏16 KB

It is typically much easier to place a static VI reference on the diagram, then
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Your model functions is overly complicated. Index array is resizeable, so get the three parameters before the loop at once. No need to index the same element with every itreation of the loop. I would recommend not to use a formula express VI.
Do you have some typical data?
Message Edited by altenbach on 01-28-2009 05:50 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
modelFnc.png ‏4 KB
modelfnc2.png ‏7 KB

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Regards
Uwe

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