forcing exponential series format
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Rachelle
Apr 9, 2012, 4:29:19 PM4/9/12
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For comparing data sets it would be quite useful to use a format such
as (a/(b+exp(-c*x))*(d*exp(-e*x)+f*exp(-g*x)+h*exp(-i*x)), as
physically this would help us determine the migration rate
contribution of various distinct populations of pore sizes. However, I
can not seem to force a series of exponential terms.
as (a/(b+exp(-c*x))*(d*exp(-e*x)+f*exp(-g*x)+h*exp(-i*x)), as
physically this would help us determine the migration rate
contribution of various distinct populations of pore sizes. However, I
can not seem to force a series of exponential terms.
Michael Schmidt
Apr 10, 2012, 11:20:52 AM4/10/12
to eureqa...@googlegroups.com
If you just need to fit the parameters, you can use empty functions such as:
y = f0()/(f1() + exp(f2()*x)) * ...
Another option would be to provide some of the forms you want as inputs, such as:
y = f0( x, exp(f1()*x), exp(f2()*x), ... )
Finally, you could try entering in a desired expression in the prior solution box at the bottom of the "Set Target" tab. Just enter with random numeric values or guesses for the parameters a,b,c, ...
Michael
y = f0()/(f1() + exp(f2()*x)) * ...
Another option would be to provide some of the forms you want as inputs, such as:
y = f0( x, exp(f1()*x), exp(f2()*x), ... )
Finally, you could try entering in a desired expression in the prior solution box at the bottom of the "Set Target" tab. Just enter with random numeric values or guesses for the parameters a,b,c, ...
Michael
--
Eureqa Formulize ( http://www.nutonian.com )
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