Re: [Haskell-cafe] hmatrix's fitModel function crashes ghc(i)

On 7 November 2010 15:19, Vivian McPhail wrote:

Message: 29

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Date: Sat, 6 Nov 2010 13:22:10 +0100 From: Roel van Dijk Subject: [Haskell-cafe] hmatrix's fitModel function crashes ghc(i) To: Haskell Caf? Message-ID: Content-Type: text/plain; charset=UTF-8

Hello,

I would like to use hmatrix to do some function fitting with the Levenberg Marquardt algorithm. As an example I would like to fit the very simple function "f x = a*x + b" on some data points. The problem is that executing the 'fitModel' function crashes GHC(i) with a segmentation fault. This makes debugging difficult. Can anyone spot what I am doing wrong? Given all the lists of Double's it seems very easy to make an error regarding the number of arguments with the model function or the derivative.

I think the problem is with linking static data in GHCi on x86_64.

Hope this helps. I seem to recall there might be a ghc trac ticket related to this but a quick search turned up nothing.

Here's the ticket:

http://hackage.haskell.org/trac/ghc/ticket/781 They aim to fix the problem (with fPIC) by ghc 7.2. Cheers, Vivian