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by jardino
Tue May 22, 2018 3:07 pm
Forum: General discussion
Topic: Pi Zero vs Cray-2 --- Bambi vs Godzilla who will win?
Replies: 7
Views: 503

Re: Pi Zero vs Cray-2 --- Bambi vs Godzilla who will win?

Takes 13 m 38 s on my Pi 3b+ - including digit display time. Program reports "Total time" of 458 s before digit display starts.

Alan.
by jardino
Tue May 22, 2018 11:16 am
Forum: Wolfram Language
Topic: Parallel Processing in Wolfram and Mathematica
Replies: 0
Views: 413

Parallel Processing in Wolfram and Mathematica

Parallel Processing has been available in Wolfram and Mathematica since Release 7. Recently I have happily been experimenting (well, messing about) with Parallel processing on an RPI with a silghtly old version of Raspian (I forget which). Using the $ProcessorCount command I get the expected result ...
by jardino
Thu Apr 19, 2018 3:42 pm
Forum: Mathematica
Topic: 3B+ BLAS performance etc
Replies: 8
Views: 864

Re: 3B+ BLAS performance etc

Sorry, this system won't allow me to attach my simple spreadsheet file. I'll need to find a workaround.
In the meantime, here is the graph with the Pi zero results deleted, to allow better resolution of the other two devices.

Alan.
Benchmarks2.jpg
Benchmarks2.jpg (45.36 KiB) Viewed 704 times
by jardino
Thu Apr 19, 2018 8:20 am
Forum: Mathematica
Topic: 3B+ BLAS performance etc
Replies: 8
Views: 864

Re: 3B+ BLAS performance etc

The raw data is in a spreadsheet. I'll get it to you later.
Alan.
by jardino
Wed Apr 18, 2018 6:07 pm
Forum: Mathematica
Topic: 3B+ BLAS performance etc
Replies: 8
Views: 864

Re: 3B+ BLAS performance etc

I used a good official power supply for the tests, but did not check the machine's temperature.
Alan.
by jardino
Wed Apr 18, 2018 2:54 pm
Forum: Mathematica
Topic: 3B+ BLAS performance etc
Replies: 8
Views: 864

Re: 3B+ BLAS performance etc

By coincidence, I've been benchmarking three of my RPis that were to hand - including my3B+. Attached are my results.
Alan.
Benchmarks.jpg
Benchmarks.jpg (34.02 KiB) Viewed 822 times
by jardino
Fri Mar 02, 2018 8:37 pm
Forum: Off topic discussion
Topic: What was your first computer?
Replies: 358
Views: 81850

Re: What was your first computer?

Well,you asked ... (I've been nervous about posting here since my first contact with a computer was probably before most people in here were born!) Anyway, it was in 1965 and was with a mainframe computer called the Honeywell 200 (H-200) - a competitor to the IBM 1401. (See photo.) H200.jpg Specific...
by jardino
Tue Feb 27, 2018 12:59 pm
Forum: Off topic discussion
Topic: [Weather] For all our UK friends...
Replies: 27
Views: 3068

Re: [Weather] For all our UK friends...

I've never been to Finland, but during my time in Norway (west coast) I was impressed by how well the Norwegians prepared for snow in winter. For a start, cars had to have snow tyres fitted from mid-October onwards. And the local farmers were issued with snow ploughs that they attached to their trac...
by jardino
Tue Feb 27, 2018 11:12 am
Forum: Mathematica
Topic: Plot a circle.
Replies: 9
Views: 1893

Re: Plot a circle.

Second Edition: ISBN-13:978-0-07-160828-2.

(Though Amazon don't believe in ISBN numbers.)

Alan.
by jardino
Tue Feb 27, 2018 9:34 am
Forum: Mathematica
Topic: Plot a circle.
Replies: 9
Views: 1893

Re: Plot a circle.

My problem in learning Mathematic is not the maths (I'm fairly competent in maths), but finding a suitable goal to work to.
I bought Schaum's outline on Mathematica, but got bored doing exercise after exercise.

Alan.
by jardino
Tue Feb 27, 2018 9:30 am
Forum: General discussion
Topic: How to label those tiny micro sd cards?
Replies: 31
Views: 12067

Re: How to label those tiny micro sd cards?

And why are they (mostly) coloured black? After they fall on my dark blue carpet, they are gone for ever - until they meet their nemesis, the vacuum cleaner. Why can't they be coloured day-glo orange or something?

Alan.
by jardino
Mon Feb 26, 2018 8:16 pm
Forum: Mathematica
Topic: Plot a circle.
Replies: 9
Views: 1893

Re: Plot a circle.

My pleasure.

I'm not a total beginner, but am still dipping my toes in the water.

Alan.
by jardino
Mon Feb 26, 2018 3:08 pm
Forum: Mathematica
Topic: Plot a circle.
Replies: 9
Views: 1893

Re: Plot a circle.

Try:
circle.jpg
circle.jpg (58.15 KiB) Viewed 1801 times
The first equals sign is important.

Have a look at the current issue of MagPi for tips.

Alan.
by jardino
Sun Feb 18, 2018 7:44 pm
Forum: Off topic discussion
Topic: How good is current AI ?
Replies: 15
Views: 2057

Re: How good is current AI ?

This week's "Economist" has a relevant article at:

https://www.economist.com/news/science- ... ve-it-must

I don't think you need a subscription to read it.

Alan.
by jardino
Fri Dec 15, 2017 10:16 am
Forum: Off topic discussion
Topic: Net Nostalgia
Replies: 2
Views: 1978

Net Nostalgia

From "The Economist": "Logging off: CompuServe "More than a few netizens, particularly of the older persuasion, will feel nostalgic today. The discussion forums on CompuServe, an online service founded nearly 50 years ago, will finally be shut down, calling time on the mother of social media. Althou...
by jardino
Mon Nov 13, 2017 5:05 pm
Forum: General discussion
Topic: Rapsberry Pi Cluster
Replies: 5
Views: 695

Re: Rapsberry Pi Cluster

Thanks, tvjon. I've downloaded the pdf (5 pages) and am about to digest it. Here's the link: https://www.google.co.uk/search?client=ubuntu&channel=fs&q=The+Glasgow+Raspberry+Pi+cloud%3A+A+scale+model+for+cloud+computing+infrastructures&ie=utf-8&oe=utf-8&gfe_rd=cr&dcr=0&ei=w88JWvW5JsaGtgeN1JVI Alan.
by jardino
Mon Nov 13, 2017 10:52 am
Forum: General discussion
Topic: Rapsberry Pi Cluster
Replies: 5
Views: 695

Re: Rapsberry Pi Cluster

Thanks indeed for that link, Pithagoros. At first I was sceptical - why do you need 750 RPis just to LEARN about cluster computing? I've found that my little cluster of 5 RPis is sufficient unto my learning needs. However, when you see that huge RPi clusters are useful vehicles for learning about cl...
by jardino
Sun Nov 12, 2017 2:41 pm
Forum: Off topic discussion
Topic: Forum time
Replies: 13
Views: 1577

Forum time

Sorry to grumble, but the forum time on the home page seems to be set at British Summer Time, not GMT.

Did someone forget to set the system clock back?

Alan.
by jardino
Thu Oct 12, 2017 8:31 pm
Forum: Off topic discussion
Topic: Burning down California
Replies: 18
Views: 3583

Re: Burning down California

I hope you stay safe, Mr Heydt.

I visited your region several years ago and thought it was lovely - to say nothing about the excellent wine!

And we need you back here in the forums!!

Alan.
by jardino
Fri Sep 15, 2017 11:18 am
Forum: General discussion
Topic: How to make blue tooth speaker to work?
Replies: 32
Views: 28317

Re: How to make blue tooth speaker to work?

I am experiencing similar problems, using two known good bluetooth audio devices and both jessie and stretch.
Alan.
by jardino
Sat Aug 05, 2017 8:56 am
Forum: Off topic discussion
Topic: IBM's world record: 330TB uncompressed data on a palm-sized tape cartridge
Replies: 15
Views: 2074

Re: IBM's world record: 330TB uncompressed data on a palm-sized tape cartridge

I have a question about IBM tape drives of the period around 1965 or so: were they able to read in reverse? The reason I ask is that my introduction to the computer industry was factory-commissioning Honeywell 204 series drives, which could read in reverse. I was told that this was a "killer" featur...
by jardino
Tue Jul 11, 2017 10:10 am
Forum: Off topic discussion
Topic: Programming Question
Replies: 22
Views: 3931

Re: Programming Question

I was in the computer business for nearly four decades and never had a need to use mathematics, other than arithmetic. When I got involved in programming close to the machine level, some facility in converting decimal numbers to and from octal and hexadecimal had to be learned, however. (In fact, du...
by jardino
Thu Jul 06, 2017 11:44 am
Forum: General discussion
Topic: Is a PI 3 a viable desktop replacement?
Replies: 53
Views: 24507

Re: Is a PI 3 a viable desktop replacement?

I've been using my RPi 3b as a desktop for a little while now (just mundane stuff such as word processing, etc.) and am quite happy with it. However, I've been struggling to get it connected to my Windows network so that it can access network storage etc.) I'm sure I've seen a guide somewhere but I ...
by jardino
Sat Jun 10, 2017 7:45 am
Forum: Off topic discussion
Topic: What happened to British Airways computers?
Replies: 44
Views: 5446

Re: What happened to British Airways computers?

Not strictly a fail-over story, but here goes: I was once designing a multi-computer system for the Port of Rotterdam in the early 80s. The system was supposed to run 24/7 (it monitored shipping in the Port). At the time, we had to take the central database down for an hour every week. At first the ...
by jardino
Wed Jun 07, 2017 3:27 pm
Forum: Off topic discussion
Topic: Lol- The joking thread
Replies: 316
Views: 58069

Re: Lol- The joking thread

Or, in a similar situation, the excited husband says to the wife - "Go on - moan in my ear".

She says, "You bought that paint for the kitchen months ago and haven't lifted a finger to paint the kitchen!"

Alan.

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