Prof. Paul Penfield and I have a website of APL material based on his circuit analysis extensions to APL called MARTHA (http://www.marthallama.org/).
Prof. Paul Penfield and I have a website of APL material based on his
circuit analysis extensions to APL called MARTHA (http://www.marthallama.org/). Paul & I aren't getting any younger, and
(as far as I know) visits to the website are now very few & far between.
I was thinking it would be good to find a more permanent home for the material.
I tried to contact Prof. Lee Dickey at the email address provided at the
APL Archive website he maintained at the University of Waterloo. After several days, I just got an email delivery failure notice.
Does anyone know if Prof. Dickey is still maintaining the archives? If
so, any idea how best to get in touch with him?
If the Waterloo archives are no longer being supported, is there another repository we can consider?
Thanks!
Doug White
Prof. Paul Penfield and I have a website of APL material based on his
circuit analysis extensions to APL called MARTHA (http://www.marthallama.org/). Paul & I aren't getting any younger, and
(as far as I know) visits to the website are now very few & far between.
I was thinking it would be good to find a more permanent home for the material.
I tried to contact Prof. Lee Dickey at the email address provided at the
APL Archive website he maintained at the University of Waterloo. After several days, I just got an email delivery failure notice.
Does anyone know if Prof. Dickey is still maintaining the archives? If
so, any idea how best to get in touch with him?
If the Waterloo archives are no longer being supported, is there another repository we can consider?
Thanks!
Doug White
On Tuesday, 15 December 2020 at 22:52:10 UTC+1, Doug White wrote:(x_
Prof. Paul Penfield and I have a website of APL material based on his
circuit analysis extensions to APL called MARTHA
(http://www.marthallama.org/).
Forgive me for hijacking the thread. I cannot answer your question
about Prof. Dickey, but I have a curiosity about the project itself.
I read in the brochure: "What kinds of circuits does MARTHA handle?
Linear circuits..."
Since I studied very little electronic in my life and even that was
more than 25 years ago, I had to ask wikipedia for help (https://en.wikipedia.org/wiki/Linear_circuit) from which I quote: "
A linear circuit is an electronic circuit which obeys the
superposition principle.[1][2][3] This means that the output of the
circuit F(x) when a linear combination of signals ax1(t) + bx2(t) is
applied to it is equal to the linear combination of the outputs due to
the signals x1(t) and x2(t) applied separately:
{\displaystyle F(ax_{1}+bx_{2})=aF(x_{1})+bF(x_{2})\,}F(ax_{1}+bx_{2})=aF(x_{1})+bF
{2})\, It is called a linear circuit because the output of such a
circuit is a linear function of its inputs.[1][2][3] "
Right. That's a definition which I like because, as a physicist, I was thoroughly drilled on linear functions.
Then I read in the brochure: "MARTHA includes, besides R, L, and C,
sixteen controlled sources; operational amplifiers; mutual inductance;
three transistor models and the possibility of easily creating others;
ideal transformers; several composite pi and tee structures; and a few
exotic elements such as gyrators."
Hold on a second: I thought that transistors were non-linear
components. And, in fact, Wikipedia says: "
A linear circuit is one that has no nonlinear electronic components in it.[1][2][3] Examples of linear circuits are amplifiers,
differentiators, and integrators, linear electronic filters, or any
circuit composed exclusively of ideal resistors, capacitors,
inductors, op-amps (in the "non-saturated" region), and other "linear" circuit elements.
Some examples of nonlinear electronic components are: diodes,
transistors, and iron core inductors and transformers when the core is saturated. Some examples of circuits that operate in a nonlinear way
are mixers, modulators, rectifiers, radio receiver detectors and
digital logic circuits. "
Maybe the apparent contradiction comes from the fact that the models available in Martha are only considered in their linear region? Also,
it is possible that the full documentation goes to major length about
the actual definitions. If so, forgive my laziness.
Thank you in advance for your consideration.
All the best,
--
Stefano
Doug White wrote:
Prof. Paul Penfield and I have a website of APL material based on his
circuit analysis extensions to APL called MARTHA
(http://www.marthallama.org/). Paul & I aren't getting any younger,
and (as far as I know) visits to the website are now very few & far
between. I was thinking it would be good to find a more permanent
home for the material.
I tried to contact Prof. Lee Dickey at the email address provided at
the APL Archive website he maintained at the University of Waterloo.
After several days, I just got an email delivery failure notice.
Does anyone know if Prof. Dickey is still maintaining the archives?
If so, any idea how best to get in touch with him?
If the Waterloo archives are no longer being supported, is there
another repository we can consider?
Thanks!
Doug White
Searching the Uwaterloo.ca website revealed this:
https://uwaterloo.ca/pure-mathematics/people-profiles/leroy-j-dickey
leading to this:
http://www.math.uwaterloo.ca/~ljdickey/
HTH
Doug White wrote:
Prof. Paul Penfield and I have a website of APL material based on his
circuit analysis extensions to APL called MARTHA
(http://www.marthallama.org/). Paul & I aren't getting any younger,
and (as far as I know) visits to the website are now very few & far
between. I was thinking it would be good to find a more permanent
home for the material.
I tried to contact Prof. Lee Dickey at the email address provided at
the APL Archive website he maintained at the University of Waterloo.
After several days, I just got an email delivery failure notice.
Does anyone know if Prof. Dickey is still maintaining the archives?
If so, any idea how best to get in touch with him?
If the Waterloo archives are no longer being supported, is there
another repository we can consider?
Thanks!
Doug White
No idea about Prof. Dickey but perhaps this would be an opportunity
for Dyalog to step up and offer an archival site? Of course, it is
easy for me to suggest other people do things for free, but Dyalog
seems to be the largest company to offer APL related software etc.
That would be exceedingly generous of Dyalog, especially given that none
of the workspaces have been tested in their APL. Prof. Penfield was
very thorough in his developement of MARTHA, and he had test workspaces
to put all the core functions through their paces and verify their
outputs. I went through the conversion process from an IBM maninframe environment to an STSC mainframe system, and then to STSC PC APL,
APL*PLUS III, as well as MicroAPL on a Mac. The process is never
seamless, especially where graphics are involved.
I did document all the conversion issues I ran into. They are included
in the MARTHA/LLAMA web site documents for anyone attempting a new port,
or wrestling with similar coinversion issues with unrelated workspaces.
Doug White
"Kerry Liles" <kerry...@gmail.com> wrote in news:rrda9m$g09$1...@dont-email.me:
Doug White wrote:
Prof. Paul Penfield and I have a website of APL material based on his
circuit analysis extensions to APL called MARTHA
(http://www.marthallama.org/). Paul & I aren't getting any younger,
and (as far as I know) visits to the website are now very few & far
between. I was thinking it would be good to find a more permanent
home for the material.
I tried to contact Prof. Lee Dickey at the email address provided at
the APL Archive website he maintained at the University of Waterloo.
After several days, I just got an email delivery failure notice.
Does anyone know if Prof. Dickey is still maintaining the archives?
If so, any idea how best to get in touch with him?
If the Waterloo archives are no longer being supported, is there
another repository we can consider?
Thanks!
Doug White
No idea about Prof. Dickey but perhaps this would be an opportunity--
for Dyalog to step up and offer an archival site? Of course, it is
easy for me to suggest other people do things for free, but Dyalog
seems to be the largest company to offer APL related software etc.
This email has been checked for viruses by AVG.
https://www.avg.com
<snip>Doug White wrote:
Prof. Paul Penfield and I have a website of APL material based on
his circuit analysis extensions to APL called MARTHA
(http://www.marthallama.org/). Paul & I aren't getting any
younger, and (as far as I know) visits to the website are now very
few & far between. I was thinking it would be good to find a more
permanent home for the material.
I tried to contact Prof. Lee Dickey at the email address provided
at the APL Archive website he maintained at the University of
Waterloo. After several days, I just got an email delivery failure
notice.
Does anyone know if Prof. Dickey is still maintaining the
archives? If so, any idea how best to get in touch with him?
If the Waterloo archives are no longer being supported, is there
another repository we can consider?
Thanks!
Doug White
Dear Doug,
Dyalog APL has a github site: https://github.com/Dyalog
You could also try to archive on the sigapl web site:
http://www.sigapl.org/
There is a page where you can send an email.
Guy L.
Yes, in the case of transistors, they are simulated with a "smallYes commonly it is the "linear over a range of operating parameters" that these transistor parameters are quoted for.
signal" linear model. The transistor parameters are calcualted at a
specific bias condition ("operating point").
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