Re: Extract parameters from FIndFit output

• To: mathgroup at smc.vnet.net
• Subject: [mg107562] Re: Extract parameters from FIndFit output
• From: Arnold Smit <arnold.smit at ziggo.nl>
• Date: Wed, 17 Feb 2010 07:02:32 -0500 (EST)
• References: <hl0opp\$t47\$1@smc.vnet.net>

```Frank,

There are some strange characters in your mail, but say your parameters are
called mu and sd, then what you get is a list of rules:
In:  fitLogNormal // FullForm
Out: List[Rule[mu, 3.4773291281865117`], Rule[b, 1.1977331975446315`]]

- The first element is a Rule
In:  fitLogNormal[[1]] // FullForm
Out: Rule[mu, 3.4773291281865117`]

- You can get to any part of any expression by indexing, f.i.
In:  fitLogNormal[[1]][[0]] (* equivalent to fitLogNormal[[1,0]] *)
Out: Rule
In:  fitLogNormal[[1]][[1]]
Out: mu
In:  fitLogNormal[[1,2]]
Out: 3.47733

- So the simplest way to get to your parameter values is probably:
In:  fitLogNormal[[All, 2]]
Out: {3.47733, 1.19773}

Hope this helps, grtz Arnold

On 11-2-2010 12:14, Frank Letkiewicz wrote:
> Is it possible to extract the parameter values generated from FindFIt to
> use in other operations?
>
> For example:
>
> xvalues = {3, 5, 12, 47, 81, 112, 129, 186};
> yvalues = {0.05, 0.10, 0.25, 0.50, 0.75, 0.90, 0.95, 0.99};
> data = Partition[Riffle[xvalues, yvalues], 2];
> fitLogNormal = FindFit[data, CDF[LogNormalDistribution[=CE=BC, =CF=83],
> x], {=CE=BC, =CF=83}, x]
>
> Out[396]= {=CE=BC ->  3.47733, =CF=83 ->  1.19773}
>
> Can I extract these =CE=BC and =CF=83 values in the output as regular
> numbers?
>
> Frank L.
>

```

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