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by jardino
Wed Oct 17, 2018 10:33 am
Forum: Scratch
Topic: Beginning with scratch
Replies: 4
Views: 1837

Re: Beginning with scratch

I'm in a similar situation to the OP, in that I'm starting to teach my 7-year-old granddaughter Scratch. (They're teaching Scratch in her school, but she was struggling with sprite selection and manipulation - probably because her teacher doesn't have enough time for one-to-help help.) We've got ove...
by jardino
Fri Sep 14, 2018 7:26 pm
Forum: Off topic discussion
Topic: What was your first computer?
Replies: 374
Views: 91395

Re: What was your first computer?

He-he. I worked on Honeywell's H-200, which was a direct competitor to the IBM 1401 (but better!) The typical memory size was 4k to 16k. When a customer needed 24k, we had to engage a welder to extend the cabinet that held the memory modules. I'm glad that nowadays I can plug a 16 G-byte micro-SD ca...
by jardino
Fri Sep 14, 2018 12:08 pm
Forum: Off topic discussion
Topic: What was your first computer?
Replies: 374
Views: 91395

Re: What was your first computer?

Not that worked on this machine - but I thought this item was interesting.

I thought that my washing-machine-sized disc drives were large, but have a look at this picture from1956 of an IBM computer.
These two drives (in the foreground) could store as much as 15 Mbytes of data each!
Alan.
by jardino
Fri Sep 07, 2018 12:55 pm
Forum: General discussion
Topic: Raspberry Pi is a waste of time (and money).
Replies: 115
Views: 4841

Re: Raspberry Pi is a waste of time (and money).

As a one-time computer consultant and technical writer (for clients - not for publication) there are many things I learned. Among them are: 1) Regardless of your audience, always define abbreviations the first time used (e.g. means "for example"). This is something that posters herein often fail to ...
by jardino
Thu Sep 06, 2018 3:38 pm
Forum: Wolfram Language
Topic: Parallel Processing in Wolfram and Mathematica
Replies: 1
Views: 796

Re: Parallel Processing in Wolfram and Mathematica

Sorted, I think.

After installing Stretch on a new RPi 3B I did the usual "apt-get update".
I noticed that the on-screen log devoted a lot of time to upgrading Wolfram.
And so, afterwards, I found that I now have 4 processors!

Now back to my ventures in parallel processing in Wolfram...

Alan.
by jardino
Sun Aug 26, 2018 8:20 pm
Forum: Add-ons
Topic: PoEHAT - Ethernet cablie current capabilities
Replies: 2
Views: 337

PoEHAT - Ethernet cablie current capabilities

Has anybody looked into the current-carrying capabilities of commonly available Ethernet cables? I'm about to buy a PoE HAT - for no particular purpose - I'm just a tinkerer - and was wondering about this problem. For instance, my little local network uses (but not exclusively) these handy Ethernet ...
by jardino
Sat Jul 21, 2018 8:13 pm
Forum: Off topic discussion
Topic: Python and "The Economist"
Replies: 4
Views: 534

Re: Python and "The Economist"

You're quicker than me!
Alan.
by jardino
Sat Jul 21, 2018 8:10 pm
Forum: Off topic discussion
Topic: Python and "The Economist"
Replies: 4
Views: 534

Re: Python and "The Economist"

Sorry - I mis-typed the link.

Here it is:

https://www.economist.com/science-and-t ... w-audience

Alan.
by jardino
Sat Jul 21, 2018 8:00 pm
Forum: Off topic discussion
Topic: Python and "The Economist"
Replies: 4
Views: 534

Python and "The Economist"

I've just read an interesting (and amusing) article about Python in "The Economist" newspaper at: https://www.economist.com/science-and-technology/2018/07/21/python-has-brought-computer-programming-to-a-vast-new-audienc e I agree with almost all of it, except the last paragraph in the section entitl...
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: 658

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: 1
Views: 796

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: 1518

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 1358 times
by jardino
Thu Apr 19, 2018 8:20 am
Forum: Mathematica
Topic: 3B+ BLAS performance etc
Replies: 8
Views: 1518

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: 1518

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: 1518

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 1476 times
by jardino
Fri Mar 02, 2018 8:37 pm
Forum: Off topic discussion
Topic: What was your first computer?
Replies: 374
Views: 91395

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: 3299

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: 2377

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: 2377

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: 13530

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: 2377

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: 2377

Re: Plot a circle.

Try:
circle.jpg
circle.jpg (58.15 KiB) Viewed 2285 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: 2273

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: 2032

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: 763

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.

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