From jondrews at fastmail.com  Tue Oct 12 18:24:38 2021
From: jondrews at fastmail.com (Jonathan Drews)
Date: Tue, 12 Oct 2021 16:24:38 -0600
Subject: [Semibug] Hamilton BUG on Jitsi right now
Message-ID: <d052c047-dd8b-44e9-bcc0-68f0c02c6764@www.fastmail.com>

The Hamilto BUG monthly Jitsi meeting is on right now:
https://meet.jit.si/hambug
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From jondrews at fastmail.com  Wed Oct 13 00:09:26 2021
From: jondrews at fastmail.com (Jonathan Drews)
Date: Tue, 12 Oct 2021 22:09:26 -0600
Subject: [Semibug] Saint Louis UNIX Users Group Meets Tomorrow
Message-ID: <YWZb9onzQRI3s+XG@leo.easyfashionclothing.com>

Folks:

 Sluug is holding an online meeting tomorrow, if you care to attend.

                 St. Louis Unix Users Group (SLUUG)
                        https://www.sluug.org/

                  6:30 ~ 9:00 PM (Central Time, USA)
      **We will open the remote session at about 6:00 PM**

BASE: SNAP Your Apps by Lee Lammert
MAIN: gitso is to support others by Stan Reichardt

This session can use the following link:

> https://us06web.zoom.us/j/92104265810?pwd=VlJOdjNxMllFcWlrZXBrZTk4eTRvUT09

We are a not-for-profit professional association dedicated to education
and communication among computer users. Networking experts, System
experts, hobbyists, students, plus many who are interested in Unix,
Unix-like Operating Systems, Linux, BSD and other Free Open Source
Software (FOSS) applications, products, projects, and services.


From jondrews at fastmail.com  Sun Oct 17 11:43:40 2021
From: jondrews at fastmail.com (Jonathan Drews)
Date: Sun, 17 Oct 2021 09:43:40 -0600
Subject: [Semibug] Need Help with C language
Message-ID: <577f7b9f-34a4-446a-909b-ba6fda99c9c1@www.fastmail.com>

Hi Folks:

 I am trying to understand the C code in "Numerical Recipes for C". I came across this puzzling
fragment:

for ( it=1, j=1; j <= n-1; j++ )  it <<= 1;
.....
.....
I know that it << 1 is a bitwise shift operation. What does it <<= 1 mean?


--
Kind regards,
Jonathan
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From acascianelli at icloud.com  Sun Oct 17 11:54:20 2021
From: acascianelli at icloud.com (Anthony Cascianelli)
Date: Sun, 17 Oct 2021 11:54:20 -0400
Subject: [Semibug] Need Help with C language
In-Reply-To: <4952B33D-1FCD-439B-8666-0056DE15BFE7@icloud.com>
References: <4952B33D-1FCD-439B-8666-0056DE15BFE7@icloud.com>
Message-ID: <108AE054-7972-40DE-93CD-F579C63FD2E8@icloud.com>

Ugh. Ignore last email. Long night. Sorry. 

Anthony Cascianelli

> On Oct 17, 2021, at 11:53 AM, Anthony Cascianelli <acascianelli at icloud.com> wrote:
> 
> ?Bitwise left shift. I think. 
> 
> Anthony Cascianelli
> 
>> On Oct 17, 2021, at 11:44 AM, Jonathan Drews <jondrews at fastmail.com> wrote:
>> 
>> ?
>> Hi Folks:
>> 
>> I am trying to understand the C code in "Numerical Recipes for C". I came across this puzzling
>> fragment:
>> 
>> for ( it=1, j=1; j <= n-1; j++ )  it <<= 1;
>> .....
>> .....
>> I know that it << 1 is a bitwise shift operation. What does it <<= 1 mean?
>> 
>> 
>> --
>> Kind regards,
>> Jonathan
>> _______________________________________________
>> Semibug mailing list
>> Semibug at lists.nycbug.org
>> http://lists.nycbug.org:8080/mailman/listinfo/semibug


From acascianelli at icloud.com  Sun Oct 17 11:53:37 2021
From: acascianelli at icloud.com (Anthony Cascianelli)
Date: Sun, 17 Oct 2021 11:53:37 -0400
Subject: [Semibug] Need Help with C language
In-Reply-To: <577f7b9f-34a4-446a-909b-ba6fda99c9c1@www.fastmail.com>
References: <577f7b9f-34a4-446a-909b-ba6fda99c9c1@www.fastmail.com>
Message-ID: <4952B33D-1FCD-439B-8666-0056DE15BFE7@icloud.com>

Bitwise left shift. I think. 

Anthony Cascianelli

> On Oct 17, 2021, at 11:44 AM, Jonathan Drews <jondrews at fastmail.com> wrote:
> 
> ?
> Hi Folks:
> 
>  I am trying to understand the C code in "Numerical Recipes for C". I came across this puzzling
> fragment:
> 
> for ( it=1, j=1; j <= n-1; j++ )  it <<= 1;
> .....
> .....
> I know that it << 1 is a bitwise shift operation. What does it <<= 1 mean?
> 
> 
> --
> Kind regards,
> Jonathan
> _______________________________________________
> Semibug mailing list
> Semibug at lists.nycbug.org
> http://lists.nycbug.org:8080/mailman/listinfo/semibug


From job at sobornost.net  Sun Oct 17 11:47:48 2021
From: job at sobornost.net (Job Snijders)
Date: Sun, 17 Oct 2021 15:47:48 +0000
Subject: [Semibug] Need Help with C language
In-Reply-To: <577f7b9f-34a4-446a-909b-ba6fda99c9c1@www.fastmail.com>
References: <577f7b9f-34a4-446a-909b-ba6fda99c9c1@www.fastmail.com>
Message-ID: <YWxFpOHQgRCWE/70@bench.sobornost.net>

On Sun, Oct 17, 2021 at 09:43:40AM -0600, Jonathan Drews wrote:
> I know that it << 1 is a bitwise shift operation. What does it <<= 1 mean?

This is a 'bitwise assignment operator'.

The string '<<=' means "left shift assignment"

https://en.wikipedia.org/wiki/Bitwise_operations_in_C

Kind regards,

Job


From jondrews at fastmail.com  Sun Oct 17 18:23:12 2021
From: jondrews at fastmail.com (Jonathan Drews)
Date: Sun, 17 Oct 2021 16:23:12 -0600
Subject: [Semibug] Need Help with C language
In-Reply-To: <YWxFpOHQgRCWE/70@bench.sobornost.net>
References: <577f7b9f-34a4-446a-909b-ba6fda99c9c1@www.fastmail.com>
 <YWxFpOHQgRCWE/70@bench.sobornost.net>
Message-ID: <8246b14e-6dfb-4383-ba7c-81c35223ccc5@www.fastmail.com>

I think I understand what is going on. Just as i = i + 1  can be written as
i += 1 so also can i = ( i << 1 ) be written as i <<=  1. Am I understanding that correctly?

On Sun, Oct 17, 2021, at 09:47, Job Snijders wrote:
> On Sun, Oct 17, 2021 at 09:43:40AM -0600, Jonathan Drews wrote:
> > I know that it << 1 is a bitwise shift operation. What does it <<= 1 mean?
> 
> This is a 'bitwise assignment operator'.
> 
> The string '<<=' means "left shift assignment"
> 
> https://en.wikipedia.org/wiki/Bitwise_operations_in_C
> 
> Kind regards,
> 
> Job
> 
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From jondrews at fastmail.com  Sun Oct 17 19:41:43 2021
From: jondrews at fastmail.com (Jonathan Drews)
Date: Sun, 17 Oct 2021 17:41:43 -0600
Subject: [Semibug] Need Help with C language
In-Reply-To: <8246b14e-6dfb-4383-ba7c-81c35223ccc5@www.fastmail.com>
References: <577f7b9f-34a4-446a-909b-ba6fda99c9c1@www.fastmail.com>
 <YWxFpOHQgRCWE/70@bench.sobornost.net>
 <8246b14e-6dfb-4383-ba7c-81c35223ccc5@www.fastmail.com>
Message-ID: <111758d0-07b5-49d4-828c-fee22236764a@www.fastmail.com>

I found the answer myself in Kernighan and Ritchie "The C Programming Language", 
page 50:

expr1  op= expr2 is equivalent to expr1 = expr1 op expr2 where op is any of the 
following:  + - * / % << >> & ^ |. This also holds true for ksh93. Namely in ksh93
i = ( i << 1 ) is the same as i <<=  1.

On Sun, Oct 17, 2021, at 16:23, Jonathan Drews wrote:
> I think I understand what is going on. Just as i = i + 1  can be written as
> i += 1 so also can i = ( i << 1 ) be written as i <<=  1. Am I understanding that correctly?
> 
> On Sun, Oct 17, 2021, at 09:47, Job Snijders wrote:
>> On Sun, Oct 17, 2021 at 09:43:40AM -0600, Jonathan Drews wrote:
>> > I know that it << 1 is a bitwise shift operation. What does it <<= 1 mean?
>> 
>> This is a 'bitwise assignment operator'.
>> 
>> The string '<<=' means "left shift assignment"
>> 
>> https://en.wikipedia.org/wiki/Bitwise_operations_in_C
>> 
>> Kind regards,
>> 
>> Job
>> 
> 
> _______________________________________________
> Semibug mailing list
> Semibug at lists.nycbug.org
> http://lists.nycbug.org:8080/mailman/listinfo/semibug
> 
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From jondrews at fastmail.com  Mon Oct 18 20:07:46 2021
From: jondrews at fastmail.com (Jonathan Drews)
Date: Mon, 18 Oct 2021 18:07:46 -0600
Subject: [Semibug] EMACS presentation Tue, Oct 19th
Message-ID: <YW4MUtMcpRJ01+Th@leo.easyfashionclothing.com>

Folks:

 We will have a presentation on EMACS on Tuesday, October 19th, at
1700 Detroit, MI time. This is an online meeting given through Jitsi.
The Jitsi URL is:

https://meet.jit.si/SEMI-BugEMACSPresentation

One of our members is a developer for Shopify and an accomplished EMACS
user. He will demonstrate the advantages of EMACS

--
Kind regards,

Jonathan


From jondrews at fastmail.com  Mon Oct 18 20:17:08 2021
From: jondrews at fastmail.com (Jonathan Drews)
Date: Mon, 18 Oct 2021 18:17:08 -0600
Subject: [Semibug] CORRECTION: EMACS presentation Tue, Oct 19th
In-Reply-To: <YW4MUtMcpRJ01+Th@leo.easyfashionclothing.com>
References: <YW4MUtMcpRJ01+Th@leo.easyfashionclothing.com>
Message-ID: <YW4OhLtUGHxJBcru@leo.easyfashionclothing.com>

On Mon, Oct 18, 2021 at 06:07:46PM -0600, Jonathan Drews wrote:
> Folks:
> 
>  We will have a presentation on EMACS on Tuesday, October 19th, at

The time should be 1900 Detroit, MI time. The meeting will start at that time

The Jitsi URL is:

https://meet.jit.si/SEMI-BugEMACSPresentation


From jondrews at fastmail.com  Thu Oct 21 06:04:59 2021
From: jondrews at fastmail.com (Jonathan Drews)
Date: Thu, 21 Oct 2021 04:04:59 -0600
Subject: [Semibug] Clang tutorials
Message-ID: <YXE7S/f+dbS+QcWv@leo.easyfashionclothing.com>

ddiHi Gals & Guys:

 It has been a long time since I have compiled any C programs. Can
anyone point me to a good tutorial on compiling with clang? I have
some old notes on compiling with gcc but I have used gcc in over 12
years. Does clang use compile instructions similar to this?

gcc -Wall -I/usr/local/include/ -c Bessel.c
gcc -L/usr/local/lib Bessel.o -lm -lgsl -lgslcblas -o BESSJ

I have to compile programs with local *.h files and I have forgotten
the flags that are used. The *.c programs begin with this:

#include <math.h>
#include"nrutil.h"

How would I include the nrutil.h file with my compile?


--
Kind regards,

Jonathan 


From jkeenan at pobox.com  Thu Oct 21 07:39:43 2021
From: jkeenan at pobox.com (James E Keenan)
Date: Thu, 21 Oct 2021 07:39:43 -0400
Subject: [Semibug] Clang tutorials
In-Reply-To: <YXE7S/f+dbS+QcWv@leo.easyfashionclothing.com>
References: <YXE7S/f+dbS+QcWv@leo.easyfashionclothing.com>
Message-ID: <7133d25f-3813-4a14-2c91-fd3419ca9081@pobox.com>

On 10/21/21 6:04 AM, Jonathan Drews wrote:
> ddiHi Gals & Guys:
> 
>   It has been a long time since I have compiled any C programs. Can
> anyone point me to a good tutorial on compiling with clang? 

The first link in a search at DDDG.

I have
> some old notes on compiling with gcc but I have used gcc in over 12
> years. Does clang use compile instructions similar to this?
> 
> gcc -Wall -I/usr/local/include/ -c Bessel.c
> gcc -L/usr/local/lib Bessel.o -lm -lgsl -lgslcblas -o BESSJ
> 

Yes.


From jkeenan at pobox.com  Thu Oct 21 08:19:27 2021
From: jkeenan at pobox.com (James E Keenan)
Date: Thu, 21 Oct 2021 08:19:27 -0400
Subject: [Semibug] Clang tutorials
In-Reply-To: <7133d25f-3813-4a14-2c91-fd3419ca9081@pobox.com>
References: <YXE7S/f+dbS+QcWv@leo.easyfashionclothing.com>
 <7133d25f-3813-4a14-2c91-fd3419ca9081@pobox.com>
Message-ID: <4fb8e85c-cfa0-ee63-47af-19d9c682fda6@pobox.com>

On 10/21/21 7:39 AM, James E Keenan wrote:
> On 10/21/21 6:04 AM, Jonathan Drews wrote:
>> ddiHi Gals & Guys:
>>
>> ? It has been a long time since I have compiled any C programs. Can
>> anyone point me to a good tutorial on compiling with clang? 
> 
> The first link in a search at DDDG.
> 

https://clang.llvm.org/get_started.html

> I have
>> some old notes on compiling with gcc but I have used gcc in over 12
>> years. Does clang use compile instructions similar to this?
>>
>> gcc -Wall -I/usr/local/include/ -c Bessel.c
>> gcc -L/usr/local/lib Bessel.o -lm -lgsl -lgslcblas -o BESSJ
>>
> 
> Yes.
> 
> _______________________________________________
> Semibug mailing list
> Semibug at lists.nycbug.org
> http://lists.nycbug.org:8080/mailman/listinfo/semibug