hubFS: THE place for F#

my environment:
mac os x 10.5 leopard
mono 1.2.6
F# Version 1.9.3.14, compiling for .NET Framework Version v1.1.4322

i'm trying out the first code sample in chapter two of Expert F#.
i'm able to compile (modified main.fs) and run the following with no problem:

#light

/// Analyze a string for duplicate words
let wordCount text =
let words = String.split [' '] text
let wordSet = Set.of_list words
let nWords = words.Length
let nDups = words.Length - wordSet.Count
(nWords,nDups)

let showWordCount text =
let nWords,nDups = wordCount text
printfn "--> %d words in the text" nWords
printfn "--> %d duplicate words" nDups

showWordCount "Couldn't put Humpty together again"

showWordCount "the king is dead. long live the king"
-------
output:
--> 5 words in the text
--> 0 duplicate words
--> 8 words in the text
--> 2 duplicate words

but when i try String.split;; in fsi (i start it by cd'ing to the directory containing the FSharp downloads, then typing
mono bin/fsi.exe --no-gui at the shell prompt), I get what seem to be a namespace problem(??).

> String.split;;

String.split;;
-------^^^^^^

stdin(1,7): error: FS0039: The value, constructor, namespace or type 'split' is not defined.


stdin(0,0): error: FS0039: The value or constructor 'it' is not defined.
stopped due to error

could someone help? can i resolve this problem by adding something to the lib path via #I? if so, what should I add?
i think i'm looking for the assembly containing Microsoft.FSharp.Core ??

also, will #r "Microsoft.FSharp.Core";;
or #r "Microsoft.FSharp.Core.dll";;
work?

somehopw i'm getting the following error message when I do either of the #r commands.

stdin(3,0): error: Unable to find the file Microsoft.FSharp.Core in any of
/Library/Frameworks/Mono.framework/Versions/1.2.6/lib/mono/2.0
/Users/myusername/FSharp-1.9.3.14/../assembly/GAC/Microsoft.Office.Interop.Owc11/11.0.0.0__71e9bce111e9429c
/Users/myusername/FSharp-1.9.3.14/Xceed Components/Bin/.NET/Signed DLLs
/Users/myusername/FSharp-1.9.3.14
/Users/myusername/FSharp-1.9.3.14/bin.

thanks for any help!!

something strange ...
I tried other functions in Microsoft.FSharp.Core.String and did not encounter any problem:

> String.for_all;;
val it : ((char -> bool) -> string -> bool) =

> String.map;;
val it : ((char -> char) -> string -> string) =

but

> String.Split;;

String.Split;;
-------^^^^^^

stdin(5,7): error: FS0039: The value, constructor, namespace or type 'Split' is not defined.
stopped due to error

I wonder if

open System;;

would help ?

---

// Can.

The current F# dsitribution still by default uses Mono's ".NET 1.0" configuration by default. Unfortunately String.split is only supported when using the .NET 2.0 configuration. I apologise that the first sample of the book uses something that is not seamlessly supported on Mono: it was a silly oversight.

I'm sure someone on the forums will contribute a String.split implementation you can put just before your code, and we've added String.split to the latest F# release.

We are also looking at using the .NET 2.0 configuration by default on Mono. You can do this yourself by removing your current installation of F#, unpacking it again, and deleting or commenting out the following lines from install-mono.sh before you install:

echo "Replacing fsi.exe and fsc.exe with programs that run under .NET 1.0..."

cp -p bin/fsi.exe bin/fsi-old.exe

cp -p bin/fsi10.exe bin/fsi.exe

You can also avoid reinstalling by copying back the fsi-old.exe, as long as you haven't run install-mono.sh twice already...

Please let us know if that works.

Kind regards

don

 

Hi Don, Thanks for the suggestions (which seemed to work for the most part but note the "display/delayed echo/buffer(?)" problems reported below. not sure if other Mono/Mac OS X users have encountered similar problems or if problems are specific only to mono/mac os x users but ...). I did both: (1) delete current install, unpack again, comment out the two lines you suggested, and run the new install-mono.sh; (2) delete current install, unpack again, run install-mono.sh, cp fsi-old.exe to fsi.exe (which should target .Net 2.0). In both cases, I was able to verify that fsi is now using the 2.0 binaries, but for some reason I'm having "display" problems. My experience is such that I can't seem to see what I'm typing initially (i might be typing String.split;; but what I see echoed might be .split;; and fsi gets as input "tring.split;;). I have a really fast MacBook (Intel dual-core) and 4 Gig of RAM so I'm sure the problems are being caused by something else. unfortunately, i dont know what those are :-( $ mono bin/fsi.exe --no-gui MSR F# Interactive, (c) Microsoft Corporation, All Rights Reserved F# Version 1.9.3.14, compiling for .NET Framework Version v2.0.50727 NOTE: NOTE: See 'fsi --help' for flags NOTE: NOTE: Commands: #r ;; reference (dynamically load) the given DLL. NOTE: #I ;; add the given search path for referenced DLLs. NOTE: #use ;; accept input from the given file. NOTE: #load ...;; NOTE: load the given file(s) as a compilation unit. NOTE: #time;; toggle timing on/off. NOTE: #types;; toggle display of types on/off. NOTE: #quit;; exit. NOTE: NOTE: Visit the F# website at http://research.microsoft.com/fsharp. NOTE: Bug reports to fsbugs@microsoft.com. Enjoy! > .split;; tring.split;; ^^^^^^ stdin(1,0): error: FS0039: The namespace or module 'tring' is not defined. stdin(0,0): error: FS0039: The value or constructor 'it' is not defined. stopped due to error > Striing.map;; Striing.map;; ^^^^^^^^ stdin(2,0): error: FS0039: The namespace or module 'Striing' is not defined. stdin(0,0): error: FS0039: The value or constructor 'it' is not defined. stopped due to error > String.map;; val it : ((char -> char) -> string -> string) = > #quit;; - Exit...

not sure if this prints out better, but here goes:
========================
Note particularly the following:
> .split;;

tring.split;;
^^^^^^

stdin(1,0): error: FS0039: The namespace or module 'tring' is not defined.


stdin(0,0): error: FS0039: The value or constructor 'it' is not defined.
stopped due to error
> Striing.map;;
==================================

$ mono bin/fsi.exe --no-gui

MSR F# Interactive, (c) Microsoft Corporation, All Rights Reserved
F# Version 1.9.3.14, compiling for .NET Framework Version v2.0.50727

NOTE:
NOTE: See 'fsi --help' for flags
NOTE:
NOTE: Commands: #r ;; reference (dynamically load) the given DLL.
NOTE: #I ;; add the given search path for referenced DLLs.
NOTE: #use ;; accept input from the given file.
NOTE: #load ...;;
NOTE: load the given file(s) as a compilation unit.
NOTE: #time;; toggle timing on/off.
NOTE: #types;; toggle display of types on/off.
NOTE: #quit;; exit.
NOTE:
NOTE: Visit the F# website at http://research.microsoft.com/fsharp.
NOTE: Bug reports to fsbugs@microsoft.com. Enjoy!

> .split;;

tring.split;;
^^^^^^

stdin(1,0): error: FS0039: The namespace or module 'tring' is not defined.


stdin(0,0): error: FS0039: The value or constructor 'it' is not defined.
stopped due to error
> Striing.map;;

Striing.map;;
^^^^^^^^

stdin(2,0): error: FS0039: The namespace or module 'Striing' is not defined.


stdin(0,0): error: FS0039: The value or constructor 'it' is not defined.
stopped due to error
> String.map;;
val it : ((char -> char) -> string -> string) =
> #quit;;

- Exit...

Try "fsi --no-readline".   If anything GUI-related fails try "fsi --no-readline --no-gui"

Notice you spelt "Striing" wrong above in "String.map"

Thanks!

don

 

thanks! doesn't seem to have an effect.
Tthree things I noticed:
(1) with fsi for Net 2.0, I need to type Shift-s twice to get String.split;; to run without getting any error messages (even though the display might be screwed up e.g., it'll show String.split;; or tring.split;; even though I typed SString.split;; and fsi will get the "correct" input)
(2) If I made a mistake and I hit delete or backspace, my display does not update correctly (e.g., I typed String.map;; my screen shows String.map;; fsi gets ing.map and I get an error message;; OR i type StrString.map;; my screen shows StrString.map;; i get some syntax error messages but then at some point fsi seems to get the "correct" input (see trace reproduced below)
(3) I dont get these problems when i switch back to fsi for .Net 1.x.

====================
FSI for Mono .Net 2.x
====================
mono fsi.exe --no-readline --no-gui

MSR F# Interactive, (c) Microsoft Corporation, All Rights Reserved
F# Version 1.9.3.14, compiling for .NET Framework Version v2.0.50727

NOTE:
NOTE: See 'fsi --help' for flags
NOTE:
NOTE: Commands: #r ;; reference (dynamically load) the given DLL.
NOTE: #I ;; add the given search path for referenced DLLs.
NOTE: #use ;; accept input from the given file.
NOTE: #load ...;;
NOTE: load the given file(s) as a compilation unit.
NOTE: #time;; toggle timing on/off.
NOTE: #types;; toggle display of types on/off.
NOTE: #quit;; exit.
NOTE:
NOTE: Visit the F# website at http://research.microsoft.com/fsharp.
NOTE: Bug reports to fsbugs@microsoft.com. Enjoy!

> tring.split;;
val it : (char list -> string -> string list) =
> StrString.map;;

StrString.map;;
---^^

stdin(2,3): error: syntax error.
>
StrString.map;;
----^^

stdin(2,4): error: syntax error.
>
StrString.map;;
-----^^

stdin(2,5): error: syntax error.
> val it : ((char -> char) -> string -> string) =
> #quit;;

- Exit...


=================================
FSI for Mono .Net 1.x
(note: i didnt use --no-readline,
but didnt experience "display" problems either)
I only had to type Shift-S once; for String.map;;
I typed StrString.map;;
=================================

mono fsi.exe --no-gui

MSR F# Interactive, (c) Microsoft Corporation, All Rights Reserved
F# Version 1.9.3.14, compiling for .NET Framework Version v1.1.4322

NOTE:
NOTE: See 'fsi --help' for flags
NOTE:
NOTE: Commands: #r ;; reference (dynamically load) the given DLL.
NOTE: #I ;; add the given search path for referenced DLLs.
NOTE: #use ;; accept input from the given file.
NOTE: #load ...;;
NOTE: load the given file(s) as a compilation unit.
NOTE: #time;; toggle timing on/off.
NOTE: #types;; toggle display of types on/off.
NOTE: #quit;; exit.
NOTE:
NOTE: Visit the F# website at http://research.microsoft.com/fsharp.
NOTE: Bug reports to fsbugs@microsoft.com. Enjoy!

> String.split;;

String.split;;
-------^^^^^^

stdin(1,7): error: FS0039: The value, constructor, namespace or type 'split' is not defined.


stdin(0,0): error: FS0039: The value or constructor 'it' is not defined.
stopped due to error
> String.map;;
val it : ((char -> char) -> string -> string) =
> #quit;;

- Exit...

(2) should have read:

(2) If I made a mistake and I hit delete or backspace, my display does not update correctly (e.g., I typed String.map;; my screen shows String.map;; fsi gets ing.map and I get an error message;; OR i type StrString.map;; my screen shows StrString.map;; i get some syntax error messages but then at some point fsi seems to get the "correct" input (see trace reproduced below)

=================================
FSI for Mono .Net 1.x
(note: i didnt use --no-readline,
but didnt experience "display" problems either)
I only had to type Shift-S once; for String.map;;
I typed StrString.map;;
=================================

should have read

=================================
FSI for Mono .Net 1.x
(note: i didnt use --no-readline,
but didnt experience "display" problems either)
I only had to type Shift-S once; for String.map;;
I typed StrString.map;;
=================================

Maybe I'm not tracking this discussion accurately, but isn't the problem simply that "split" starts with a lower-case 's', and you typed it with an upper-case 's'? "split()" is a static function of F#'s String module.

> String.split [' '] "Tony Albert Nassar";;
val it : string list = ["Tony"; "Albert"; "Nassar"]
>

As others have reported, using fsi-old.exe fixed my larger issues as well. However, the --no-readline option definitely messes up my terminal -- console echo is missing on startup and somehow color highlighting goes crazy on me. If I explicitly use the --readline option, everything is much happier -- except I have noticed that the backspace key is no longer mapped properly and I need to use ctrl-h instead. Does anyone have an idea what is clobbering the terminal settings?

My setup:

OS X 10.5.1 Terminal.app
Mono JIT compiler version 1.2.6 (tarball)
F# Version 1.9.3.14, compiling for .NET Framework Version v2.0.50727

---

--
Chris
http://www.staze.net

I am using Windows version with Visual Studio Shell integration. I had encountered the same problem.

However, the IDE suggested me to add FSharp.PowerPack.dll and the problem was gone.

It works in the compiled version but not the interactive console. I don't know the corresponding name space to use.

I am not sure if this also applies in your Mac OSX environment

---

trn

http://fslang.blogspot.com

I had the problem.

Open up the F# Interactive.

And, type the line starting with

      #r @"FSharp.PowerPack";;

Then, it work.

 

Thanks a lot, David. It works.

Is it possible to load the DLL by default so that we don't need to type this command everytime we open up the F# Interactive ?

---

trn

http://fslang.blogspot.com