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levmar's Introduction

The Levenberg-Marquardt algorithm is an iterative technique that finds a local minimum of a function that is expressed as the sum of squares of nonlinear functions. It has become a standard technique for nonlinear least-squares problems and can be thought of as a combination of steepest descent and the Gauss-Newton method. When the current solution is far from the correct one, the algorithm behaves like a steepest descent method: slow, but guaranteed to converge. When the current solution is close to the correct solution, it becomes a Gauss-Newton method.

Optional box- and linear constraints can be given. Both single and double precision floating point types are supported.

The actual algorithm is implemented in a C library which is bundled with bindings-levmar which this package depends on.

License

This library depends on bindings-levmar which is bundled together with a C library which falls under the GPL. Please be aware of this when distributing programs linked with this library. For details see the description and license of bindings-levmar.

levmar's People

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alang9 avatar ann-yang-leapyear avatar basvandijk avatar pacak avatar roelvandijk avatar

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Forkers

roelvandijk johnlato alang9 ann-yang-leapyear phpirates dtheras

levmar's Issues

Support for hmatrix 0.17

With hmatrix 0.17 the compilation fails; one reason is because of deprecated modules being removed there (they just moved to the main hmatrix module, that's easy to fix); the other one is that one can no longer do

deriving instance (Eq r, Container Vector r) => Eq (Constraints r)

it has to be

deriving instance (Eq r, Container Vector r, Num r) => Eq (Constraints r)

now (wants a Num constraint). Does it make sense to add this constraint to this instance?

Build failure on ghc-6.12.3

Olaf Leidinger reported the following issue:

2011/12/22 Olaf Leidinger <[email protected]>:
> Hi!
>
> Being new to haskell, I wanted to port an app of mine to haskel in
> order to learn it. Therefore I wanted to use your levmar package. Yet,
> I am unable to build it using cabal on Scientific Linux 6.1
> using the provided compiler, ghc-6.12.3. The build fails with:
>
> $ cabal install levmar
> Resolving dependencies...
> Configuring levmar-1.2...
> Preprocessing library levmar-1.2...
> Building levmar-1.2...
> [1 of 2] Compiling Bindings.LevMar.CurryFriendly
> ( Bindings/LevMar/CurryFriendly.hs,
> dist/build/Bindings/LevMar/CurryFriendly.o ) [2 of 2] Compiling
> Numeric.LevMar   ( Numeric/LevMar.hs, dist/build/Numeric/LevMar.o )
>
> Numeric/LevMar.hs:274:4: Not in scope: `>>='
>
> Numeric/LevMar.hs:274:4: Not in scope: `fail'
>
> Numeric/LevMar.hs:276:6: Not in scope: `>>'
>
> Numeric/LevMar.hs:298:12: Not in scope: `>>='
>
> Numeric/LevMar.hs:298:12: Not in scope: `fail'
>
> Numeric/LevMar.hs:311:20: Not in scope: `>>='
>
> Numeric/LevMar.hs:311:20: Not in scope: `fail'
>
> Numeric/LevMar.hs:332:17: Not in scope: `>>='
>
> Numeric/LevMar.hs:332:17: Not in scope: `fail'
>
> Numeric/LevMar.hs:346:27: Not in scope: `>>='
>
> Numeric/LevMar.hs:346:27: Not in scope: `fail'
>
> Numeric/LevMar.hs:374:27: Not in scope: `>>='
>
> Numeric/LevMar.hs:374:27: Not in scope: `fail'
> cabal: Error: some packages failed to install:
> levmar-1.2 failed during the building phase. The exception was:
> ExitFailure 1
>
> As I didn't find the things which are out of scope in the source, I
> have no clue what's going wrong. Any idea?
>
> Best regards,
>
> Olaf

*** Exception: toEnum{StopReason}: tag (-1) is outside of enumeration's range (0,6)

I get the following runtime error in ghc 7.0.3 and ghc 7.2.1

levmar (const (singleton 0)) Nothing (replicate 2 0) (singleton 0) 0 defaultOpts mempty
Right (fromList [0.0,0.0],*** Exception: toEnum{StopReason}: tag (-1) is outside of enumeration's range (0,6)

This appears to happen whenever the parameters vector has length 2 or greater

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