On Fri, May 31, 2013 at 5:11 AM, <address@hidden> wrote:
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Today's Topics:
1. Re: RANDOM-ly non-random (Bruce M. Axtens)
2. Re: RANDOM-ly non-random (Bruce M. Axtens)
3. Re: open-cobol-list Digest, Vol 68, Issue 9 (Bruce M. Axtens)
4. Re: RANDOM-ly non-random (Hiroki MINEMATSU)
5. Re: open-cobol-list Digest, Vol 68, Issue 9 (Peter Klosky)
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Message: 1
Date: Fri, 31 May 2013 09:53:35 +0800
From: "Bruce M. Axtens" <address@hidden>
Subject: Re: [open-cobol-list] RANDOM-ly non-random
To: Robert Wolfe <address@hidden>,
"address@hidden"
<address@hidden>
Message-ID: <address@hidden>
Content-Type: text/plain; charset="iso-8859-1"
On 31/05/2013 12:37 AM, Robert Wolfe wrote:
> Odd, because when I go to compile this code, I get this:
>
> address@hidden:~$ cobc random.cbl
> random.cbl: In paragraph 'Main':
> random.cbl:11: Error: syntax error, unexpected PERFORM, expecting
> ADDRESS or "Identifier"
>
> System is Debian 7 "Wheezy" AMD64 running in an ESXi 5 virtual machine.
Robert
How about
$ cobc -free random.cbl
My compile command in that case was
$ cobc -x -free -I/usr/local/include -L/usr/local/lib random.cbl
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Message: 2
Date: Fri, 31 May 2013 09:57:43 +0800
From: "Bruce M. Axtens" <address@hidden>
Subject: Re: [open-cobol-list] RANDOM-ly non-random
To: Peter Klosky <address@hidden>, Robert Wolfe
<address@hidden>,
"address@hidden"
<address@hidden>
Message-ID: <address@hidden>
Content-Type: text/plain; charset="iso-8859-1"
On 31/05/2013 4:20 AM, Peter Klosky wrote:
>
> There may be another issue.
>
...
>
> ... neither your machine or mine gives the expected result. ... Few
> of your results are less than 20; same here.
>
Wow, I was so taken aback by the repetition, I didn't notice the
"failure" of REM. I wonder what's going on?
Bruce.
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Message: 3
Date: Fri, 31 May 2013 10:33:37 +0800
From: "Bruce M. Axtens" <address@hidden>
Subject: Re: [open-cobol-list] open-cobol-list Digest, Vol 68, Issue 9
To: address@hidden
Message-ID: <address@hidden>
Content-Type: text/plain; charset="iso-8859-1"
I've been fiddling with this a bit more and now have something that
appears to work 90% of the time.
IDENTIFICATION DIVISION.
PROGRAM-ID. Random-mod-disps.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 mod-disp PIC Z9.
01 seed PIC 999V999.
01 temp PIC 999V.
01 div PIC 99.
01 mod PIC 99.
88 mod-is-10 value 10.
PROCEDURE DIVISION.
Main.
MOVE FUNCTION RANDOM(FUNCTION SECONDS-PAST-MIDNIGHT) TO seed.
PERFORM FOREVER
PERFORM Generate-And-Display-mod-disp
IF mod-is-10
EXIT PERFORM
ELSE
PERFORM Generate-And-Display-mod-disp
END-IF
END-PERFORM
STOP RUN.
.
Generate-And-Display-mod-disp.
COMPUTE temp = FUNCTION RANDOM * 100.
DIVIDE temp BY 20 GIVING div REMAINDER mod.
MOVE mod TO mod-disp.
DISPLAY mod " " mod-disp.
.
Compiled with $ cobc -x -free -I/usr/local/include -L/usr/local/lib
breakloop.cob
The other 10% is where a run calculates a mod of 10 but does not exit
the perform, viz
address@hidden ~/open-cobol-1.1
$ breakloop.exe
05 5
02 2
03 3
00 0
12 12
10 10
11 11
12 12
08 8
13 13
15 15
19 19
19 19
11 11
02 2
09 9
05 5
14 14
15 15
15 15
10 10
Please note the 6th line which says that mod contains 10 and mod-disp
contains 10. Instead of terminating then, the program continues on until
it hits another 10 10 pair and *then* it terminates.
What's going on here?
Bruce.
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Message: 4
Date: Fri, 31 May 2013 11:38:23 +0900
From: Hiroki MINEMATSU <address@hidden>
Subject: Re: [open-cobol-list] RANDOM-ly non-random
To: address@hidden
Message-ID: <address@hidden>
Content-Type: text/plain; charset=UTF-8
Hello, Bruce
OpenCOBOL RANDOM returned biased value.
It is look like conacatinate '0.' and int(rand()*(2**32)) .
so, you execute this.
perl -e '$a = 0; for (1..1000) {$p = int(rand() * (2 ** 31)) ;$a +=
"0.".$p; }; print $a ;print "\n";'
it will show about 347 instead of 500.
Since it is wrong, we have to correct libcob.so.
(2013/05/30 23:30), Bruce M. Axtens wrote:
> Context: MinGW
>
> $ uname -a
> MINGW32_NT-6.1 MERCURY 1.0.17(0.48/3/2) 2011-04-24 23:39 i686 Msys
>
> $ cobc -v
> cobc (OpenCOBOL) 1.1.0
> Copyright (C) 2001-2009 Keisuke Nishida / Roger While
> Built May 29 2013 21:53:19
> Packaged Feb 06 2009 10:30:55 CET
>
>
> Sadly, I don't get to do much COBOL. The best I can do is the occasional
> RosettaCode task.
>
> I was looking at <http://rosettacode.org/wiki/Loops/Break#COBOL>. I
> copied and pasted into a text editor, made it free-form, and started to
> fiddle.
>
> I've got as far as this:
>
> IDENTIFICATION DIVISION.
> PROGRAM-ID. Random-Nums.
>
> DATA DIVISION.
> WORKING-STORAGE SECTION.
> 01 Num PIC Z9.
> 01 SEED PIC 9V999999999.
> PROCEDURE DIVISION.
> Main.
> MOVE FUNCTION RANDOM(FUNCTION SECONDS-PAST-MIDNIGHT) TO SEED.
> PERFORM FOREVER
> PERFORM Generate-And-Display-Num
>
> IF Num = 10
> EXIT PERFORM
> ELSE
> PERFORM Generate-And-Display-Num
> END-IF
> END-PERFORM
>
> GOBACK
> .
>
> Generate-And-Display-Num.
> COMPUTE Num = FUNCTION REM(FUNCTION RANDOM * 100, 20)
> DISPLAY Num
> .
> END-PROGRAM.
>
> The END-PROGRAM seemed to be mandatory. I wouldn't compile otherwise.
>
> The thing that has me confused (and thus all the fiddling with RANDOM)
> is that the program runs properly occasionally, and other time just gets
> locked on a particular value and doesn't change.
>
> A working runs looks like this:
>
> $ breakloop.exe
> 23
> 67
> 23
> 21
> 67
> 18
> 14
> 17
> 27
> 11
> 16
> 25
> 29
> 26
> 12
> 23
> 90
> 27
> 14
> 20
> 30
> 29
> 10
>
>
> but another run starts off nicely, but then gets stuck
>
> $ breakloop.exe
> 25
> 18
> 29
> 80
> 14
> 16
> 26
> 24
> 26
> 36
> 18
> 29
> 54
> 47
> 29
> 29
> 29
> ... ad infinitum
>
> Why is it so?
>
> Kind regards,
> Bruce.
>
>
>
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Message: 5
Date: Thu, 30 May 2013 20:11:11 -0700 (PDT)
From: Peter Klosky <address@hidden>
Subject: Re: [open-cobol-list] open-cobol-list Digest, Vol 68, Issue 9
To: "Bruce M. Axtens" <address@hidden>,
"address@hidden"
<address@hidden>
Message-ID:
<address@hidden>
Content-Type: text/plain; charset="iso-8859-1"
Bruce,
?
To me, your result looks right.
?
The code?is designed to quit only when the first of two generated numbers is ten.? In your example, result six is ten, which is not the terminating condition.? Result twenty-one is also ten, which is the terminating condition.
?
I ran a few dozen trials of your improved code.? Works great.? Quit after an odd number of random numbers every time.
?
thanks,
?
Peter?
________________________________
From: Bruce M. Axtens <address@hidden>
To: address@hidden
Sent: Thursday, May 30, 2013 10:33 PM
Subject: Re: [open-cobol-list] open-cobol-list Digest, Vol 68, Issue 9
I've been fiddling with this a bit more and now have something that appears to work 90% of the time.
IDENTIFICATION DIVISION.
>PROGRAM-ID. Random-mod-disps.
>
>DATA DIVISION.
>WORKING-STORAGE SECTION.
>01?? ?mod-disp ??? ?PIC Z9.
>01?? ?seed ?? ?PIC 999V999.
>01?? ?temp?? ?PIC 999V.
>01?? ?div?? ??? ?PIC 99.
>01?? ?mod?? ??? ?PIC 99.
>?? ?88?? ?mod-is-10 value 10.
>PROCEDURE DIVISION.
>Main.
>?? ?MOVE FUNCTION RANDOM(FUNCTION SECONDS-PAST-MIDNIGHT) TO
seed.
>?? ?PERFORM FOREVER
>?? ??? ?PERFORM Generate-And-Display-mod-disp
>
>?? ??? ?IF mod-is-10
>?? ??? ??? ?EXIT PERFORM
>?? ??? ?ELSE
>?? ??? ??? ?PERFORM Generate-And-Display-mod-disp
>?? ??? ?END-IF
>?? ?END-PERFORM
>
>?? ?STOP RUN.
>?? ?.
>
>Generate-And-Display-mod-disp.
>?? ?COMPUTE temp = FUNCTION RANDOM * 100.
>?? ?DIVIDE temp BY 20 GIVING div REMAINDER mod.
>?? ?MOVE mod TO mod-disp.
>?? ?DISPLAY mod " " mod-disp.
>??? .
>??
> Compiled with $ cobc -x -free -I/usr/local/include -L/usr/local/lib? breakloop.cob
The other 10% is where a run calculates a mod of 10 but does not
exit the perform, viz
address@hidden ~/open-cobol-1.1
>$ breakloop.exe
>05? 5
>02? 2
>03? 3
>00? 0
>12 12
>10 10
>11 11
>12 12
>08? 8
>13 13
>15 15
>19 19
>19 19
>11 11
>02? 2
>09? 9
>05? 5
>14 14
>15 15
>15 15
>10 10
>
Please note the 6th line which says that mod contains 10 and mod-disp contains 10. Instead of terminating then, the program continues on until it hits another 10 10 pair and *then* it terminates.
What's going on here?
Bruce.
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