fsharppowerpack Discussions Rss Feed

New Post: F# CodeDom Compiler : 'The system cannot find the file specified'

Peter2060 — Mon, 30 Apr 2012 19:09:46 GMT

You will need the full version of .NET on the server, rather than the 'Client Profile' version, but I guess you already have this.

Next, you could look at which files are included in the standalone compiler, by looking in the fsharp.zip file at the url you gave.

You could try copying these files to your application directory, from the main fsharp 'Program Files\Microsoft F#' directory on another PC. You may need to apply a .NET version redirect in a .config file to match versions between 2 and 4 - look for exception messages when you try to run your code with everything in place.

I imagine the end result will be all the files from 'FSharpPowerPack-2.0.0.0\bin' and 'Microsoft F#\v4.0' locally copied to your application directory, plus a version redirect to fix-up problems because the PowerPack expects version 2.

Give it a go - all at your own risk, of course.

New Post: F# CodeDom Compiler : 'The system cannot find the file specified'

smolina_74 — Mon, 30 Apr 2012 17:29:34 GMT

I have a project in which I need to compile F# code during runtime and I got exactly the same issue when I installed the assemblies in the server. In the server I have of course the runtime libraries and the FSharp.Compiler.CodeDom.dll. Now, installing the standalone compiler really solves the issue (though I don't think this should be the way), but my concern is that the standalone compiler comes within a CTP release http://www.microsoft.com/en-us/download/details.aspx?id=11100, is there any link where I can find the final release of f# 2.0 compiler?

New Post: Clean XCopy install of F#, F# Power Pack and F# CodeDom?

Peter2060 — Fri, 25 Nov 2011 19:55:56 GMT

I'm using F# CodeDom in a .Net 4 C# app which is XCopy-installed to a network share for permission reasons.

I want to put all the F# support files in a sub-directory of the main application directory, so I created an app.config with a 'probing private' path, and also a re-direct for FSharp.Core.dll version 2 -> 4.

However, it still seems necesary to have fsc.exe and the FSharp.Core.* files in the application directory. The other fsc.exe support files can be put in the sub-directory, though, if a fsc.exe.config is used, in the same way as the app.config.

I imagine the FSharp.Core.* files are needed in the application directory for use by fsc.exe, or the final CodeDom-compiled F#.

I tried adding '--standalone' as a parameter in the call to the CodeDom compiler, but this did not remove the need for the FSharp.Core.* files in the application directory.

Any way to have all the F# support files in the application sub-directory?

New Post: Beta?

twisterjosh — Tue, 25 Oct 2011 14:13:02 GMT

When is the PowerPack expected to be released?

New Post: F# CodeDom Compiler : 'The system cannot find the file specified'

Peter2060 — Fri, 16 Sep 2011 08:04:31 GMT

Solution: needed to install 'Standalone compiler and tools' as well as F# PowerPack on user's PC.

I had the above error after installing an app that uses F# CodeDom, on a user's PC.

The error was actually thrown by System.Diagnostics.Process.Start(), when trying to launch the F# compiler.

The solution was to install the standalone compiler and tools which are linked here:

MSDN: 'Get the F# Compiler and tools'

http://msdn.microsoft.com/en-us/fsharp/cc835251

New Post: PSeq.maxBy differs from Seq.maxBy?

spinard — Wed, 03 Aug 2011 15:09:38 GMT

Why is the type of PSeq.maxBy different from Seq.maxBy? Is this a bug?

Seq.maxBy: ('a -> 'b) -> seq<'a> -> 'a

PSeq.maxBy: ('a -> 'b) -> seq<'a> -> 'b

Example:

> let people = [ ("Steve", 33); ("Al", 41); ("Barbara", 38) ];;

val people : (string * int) list =
  [("Al", 33); ("Barbara", 41); ("Chuck", 38)]


> Seq.maxBy snd people;;
val it : string * int = ("Al", 41)

> PSeq.maxBy snd people;;
val it : int = 41

If I want to answer the question "Who is oldest?", I can write:

people |> Seq.maxBy snd |> fst;;

...but I cannot just change Seq to PSeq to parallelize it.

New Post: query to db4o

davidgrenier — Fri, 01 Jul 2011 18:28:14 GMT

I guess I fixed that problem by rebuilding against CLR4.

New Post: query to db4o

davidgrenier — Fri, 01 Jul 2011 18:13:05 GMT

I guess the following is a simpler example, I get roughly the same error:

let d = <@ fun _ -> true @> |> QuotationEvaluator.ToLinqExpression

System.InvalidCastException: [A]LambdaTerm cannot be cast to [B]LambdaTerm. Type A originates from 'FSharp.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' in the context 'Default' at location 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\FSharp.Core\v4.0_4.0.0.0__b03f5f7f11d50a3a\FSharp.Core.dll'. Type B originates from 'FSharp.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' in the context 'Default' at location 'C:\WINDOWS\assembly\GAC_MSIL\FSharp.Core\2.0.0.0__b03f5f7f11d50a3a\FSharp.Core.dll'.
   at Microsoft.FSharp.Quotations.PatternsModule.LambdaPattern(FSharpExpr input)
   at Microsoft.FSharp.Linq.QuotationEvaluation.ConvExpr(ConvEnv env, FSharpExpr inp)
   at Microsoft.FSharp.Linq.QuotationEvaluation.Expr.ToLinqExpression(FSharpExpr )
   at <StartupCode$FSI_0003>.$FSI_0003.main@() in C:\Bib\Projects\Lib\Database.fs:line 28

New Post: query to db4o

davidgrenier — Fri, 01 Jul 2011 18:03:08 GMT

Hello,

I'm having problems with doing queries on top of db4o's IQueryable API...

let get<'T when 'T :> IStorable> filter =
    query <@ seq {
        use db = openDB()
        yield! db.AsQueryable<'T>()
                |> Seq.filter filter
                |> Seq.filter (fun o -> o.HistoricId.EffectiveDate <= DateTime.Now)
                |> Seq.groupBy (fun o -> o.HistoricId.Id)
                |> Seq.map (fun (_, seq) -> seq.OrderByDescending(fun t -> t.HistoricId.EffectiveDate).First())
                |> Seq.map (fun o -> if o.HistoricId.IsActive then Some o else None)
    } @>

let getAll<'T when 'T :> IStorable> _ = get<'T>(fun _ -> true)

When executing getAll<Client>();; above I get the following stacktrace:

Binding session to 'C:\Bib\Projects\dll\Db4objects.Db4o.Linq.dll'...
System.InvalidCastException: [A]CombTerm cannot be cast to [B]CombTerm. Type A originates from 'FSharp.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' in the context 'Default' at location 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\FSharp.Core\v4.0_4.0.0.0__b03f5f7f11d50a3a\FSharp.Core.dll'. Type B originates from 'FSharp.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' in the context 'Default' at location 'C:\WINDOWS\assembly\GAC_MSIL\FSharp.Core\2.0.0.0__b03f5f7f11d50a3a\FSharp.Core.dll'.
   at Microsoft.FSharp.Quotations.PatternsModule.CallPattern(FSharpExpr input)
   at Microsoft.FSharp.Quotations.DerivedPatternsModule.SpecificCallPattern@1713-1.Invoke(FSharpExpr tm)
   at Microsoft.FSharp.Linq.QueryModule.|SpecificPipedCall0|_|@61.Invoke(FSharpExpr _arg1)
   at Microsoft.FSharp.Linq.QueryModule.EvalOuterWithPostProcess@643(FSharpExpr tm)
   at Microsoft.FSharp.Linq.QueryModule.query[T](FSharpExpr`1 p)
   at FSI_0002.Database.getAll[T](Object _arg2) in C:\Bib\Projects\Lib\Database.fs:line 39
   at <StartupCode$FSI_0005>.$FSI_0005.main@()
Stopped due to error

I would assume this is unrelated to db4o but I don't think I'll figure this one out.

Thanks!

David

New Post: Operator '*' with Type constraint mismatch

degloff — Thu, 23 Jun 2011 08:27:59 GMT

I use the Powerpack matrix class. It is defining an operator * like

/// Multiply each element of a matrix by the given scalar value
static member ( * ) : Matrix * 'T -> Matrix

However, I cannot use it in a generic function:

// this works, I can use '*' if type is fixed, like int
let mm = Matrix.Generic.ofSeq [[ 1; 2; 3];[ 4; 5; 6];[ 7; 8; 9]]
let mmm = mm * 2

// Error 1 Type constraint mismatch when applying the default type 'Matrix' for a type inference variable.
// The resulting type would be infinite when unifying ''T' and 'Matrix' Consider adding further type constraints
let f2 (a:Matrix) (z:'T) = a*z

I do not understand the error message of the compiler. What does it mean and how do I fix it?

New Post: Is PowerPack installed?

JonnyBoats — Mon, 11 Apr 2011 04:15:11 GMT

Captain,

How did the recompile work out for you?

New Post: fslex - matching unicode character groups.

dsyme — Tue, 08 Mar 2011 02:45:55 GMT

You can use unicode character classes, e.g. see http://blogs.msdn.com/b/dsyme/archive/2009/10/21/some-smaller-features-in-the-latest-release-of-f.aspx

let letter = '\Lu' | '\Ll' | '\Lt' | '\Lm' | '\Lo' | '\Nl'

let surrogateChar = '\Cs'

let digit = '\Nd'

let connecting_char = '\Pc'

let combining_char = '\Mn' | '\Mc'

let formatting_char = '\Cf'

The character classes are described here (also elsewhere online - they are, I believe, standard): http://msdn.microsoft.com/en-us/library/20bw873z(v=vs.71).aspx,

New Post: fslex - matching unicode character groups.

schernichkin — Sat, 05 Mar 2011 15:06:42 GMT

Such as Char.IsWhiteSpace(), Char.IsUpper() Char.IsPunctuation() etc. What is the best way to implement matching rules?

New Post: The namespace or module Matrix is not defined.

rbunn83815 — Tue, 01 Mar 2011 17:01:13 GMT

It utrns out I needed to add these two lines to the top of my script file:

#r "FSharp.PowerPack.dll"
#r "FSharp.PowerPack.Parallel.Seq.dll"

Bob

New Post: The namespace or module Matrix is not defined.

rbunn83815 — Tue, 01 Mar 2011 16:36:37 GMT

I'm really new to F#, so sorry for asking such an elementary question:

I have this snippet of code at the top of an Fsx file with PowerPack.dll 2.0.0.0 listed in my project references:

open Microsoft.FSharp.Math

// Flattens a 2D array into a sequence
let array2D_to_seq arr =
   seq {for i in 0..Array2D.length1 arr - 1 do
            for j in 0..Array2D.length2 arr - 1 do yield arr.[i,j]}

// Find maximum value in a matrix
let max_value_in_matrix m =
    m
    |> Matrix.Generic.toArray2D
    |> array2D_to_seq
    |> PSeq.max

Both Matrix and PSeq have red squiggly lines underneath them saying "The namespace or module 'Matrix' is not defined." I must be missing something obvious, but for the life of me cannot see it.

Thanks in advance,

Bob

New Post: How to deploy for Mono 2.10?

dw3w4at — Sat, 19 Feb 2011 22:18:04 GMT

In Mono 2.10, the directory structure has been changed, especially, for FSharp's one.

How do I deploy files in FSharpPowerPack.zip?

New Post: Problem with FSharp.PowerPack.Parallel.Seq

dsyme — Mon, 14 Feb 2011 17:02:37 GMT

Hi Kevin,

I've lost the context a little, could you list the specific problem again?

- Is this Mono or Windows CLR?

- Is this just a problem with fshtmldoc.exe? Or are you unable to use any of the libraries?

- Have you tried just addingt the powerpack modules you want to use in source form to your own projects?

thanks

don

New Post: Problem with FSharp.PowerPack.Parallel.Seq

kevinsvanhorn — Mon, 07 Feb 2011 18:37:37 GMT

It's been a few weeks since I asked this question. Does anyone know what's going on with this? Do fshtml.exe and the PowerPack libraries other than Parallel.Seq require an earlier version of .Net?

New Post: Problem with FSharp.PowerPack.Parallel.Seq

kevinsvanhorn — Tue, 25 Jan 2011 05:20:02 GMT

Thanks for the help. I'm confused as to what's going on with Mono, though. I'm running Mono 2.8.2, and the information I've found indicates that it's supposed to default to a .Net 4.0 profile. Furthermore, running

fsharpi --noframework -r /Library/Frameworks/Mono.framework/Libraries/mono/4.0/mscorlib.dll

immediately gives me the error

error FS0219: The referenced or default base CLI library 'mscorlib' is binary-incompatible with the referenced F# core library '/usr/lib/fsharp/FSharp.Core.dll'. Consider recompiling the library or making an explicit reference to a version of this library that matches the CLI version you are using.

whereas substituting 2.0 for 4.0 starts up fine, which seems to indicate that FSharp.Core.dll wants the 2.0 profile. (BTW, as far as I can tell this is the most recent CTP version of F# -- I downloaded the most recent version (November 10 Update) from fxsplat.codeplex.com, in particular, the Mac installer. Furthermore, when fsharpi starts up it identifies itself as F# 2.0 Interactive build 2.0.0.0 .)

On Windows, I do in fact have .NET 4.0 installed -- c:\windows\Microsoft.NET\Framework\v4.0.30319 is there.

I am using Visual Studio 2010 Shell.

New Post: Problem with FSharp.PowerPack.Parallel.Seq

dsyme — Mon, 24 Jan 2011 13:47:05 GMT

These issues stem from the fact that FSharp.PowerPack.Parallel.Seq.dll is a .NET 4.0 component.

On Linux/Mono, the default profile for F# is Mono's equivalent of .NET 3.5. To run F# code on .NET 4.0 I think you'll need to change some Mono settings, and possible reference the Mono 4.0 profile mscorlib.dll directly.

On Windows, I think either

maybe you don't have .NET 4.0 installed (check for c:\windows\Microsoft.NET\Framework\v4.0.30319),
this may be a specific problem with fshtml.exe, it is possible

Which version of Visual Studio do you have on Windows (if any?)

thanks

don