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'fold_left' and 'iter' errors
f#

I am trying to run some code using VS2010 and I am getting the following errors:

Error 1 The field, constructor or member 'iter' is not defined. K:\MyDocs\Visual Studio 10\Projects\TrueSkill\Infer.fs 74 34 NPlayerTrueSkill

Error 2 The field, constructor or member 'fold_left' is not defined. K:\MyDocs\Visual Studio 10\Projects\TrueSkill\Infer.fs 87 48 NPlayerTrueSkill

Here is the code snippet that is causing the errors:

/// Computes the log normalisation constant.
member this.LogNormalisation =
/// Reset the marginals
fList |> ResizeArray.iter (fun f -> f.ResetMarginals())

/// Get the product of S_i
let sumLogS = fList |> ResizeArray.fold_left (fun acc f -> acc + (f.LogNormalisation ())) 0.0

sumLogZ + sumLogS

Any ideas?

.

'fold_left' is now simply called 'fold'. I didn't think 'iter' had been renamed (but I could be wrong). It could be that iter has just been removed from 'ResizeArray'. In that case you can just use Seq.iter (and maybe better to move to Seq.fold for consistency).

As this comes from a sample from the interweb maybe the author will get round to updating it, especially as they occasionally read this forum :)

Cheers,

Rob

By on 1/27/2010 6:11 AM ()

Thank you for the solution it now works.

By on 1/27/2010 5:04 PM ()

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