Dear Friends.

I used nls( ) function and encountered error message "step factor
0.000488281 reduced below 'minFactor' of 0.000976563". I then tried the
following:

 1) Put "nls.control(minFactor = 1/(4096*128))" inside the brackets of nls,
but the same error message shows up.

 2) Put "nls.control(minFactor = 1/(4096*128))" as a separate command before
the command that use nls( ) function, again, the same thing happens,
although the R responds to the nls.control( ) function immediately:

---------------------------------

$maxiter

[1] 50



$tol

[1] 1e-05



$minFactor

[1] 1.907349e-06

--------------------------------------


I am wondering how may I change the minFactor to a smaller value? The manual
that comes with the R software about nls( )  is very sketchy --- the only
relevant example I see is a separate command like 2).

A more relevent question might be, is lower the 'minFactor'  the only
solution to the problem? What are the other options?

Best Wishes
Yuchen Luo

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