pgtan

> 10x -x

subtracting infinities is dangerous, you can achieve any result from it

https://www.youtube.com/watch?v=-EtHF5ND3_s

What is this mass psychosis of feeling the urge to own a dog or cat anyway? And how it comes, that environmentalists don't get loud on the harm on nature caused by domestic cats and dogs?

I try to implement in Emacs Lisp Knuth's combinatorial algorithms from

https://www-cs-faculty.stanford.edu/~knuth/fasc2b.ps.gz

I just managed to finish the first Alg. P (plain changes); it was really hard, considering that I didn't understand the algorithm and the description is made for Pascal like languages.

This is how socialism "works". One pays enormous taxes his whole life, but then, when it comes for government to protect one's health, they do nothing and name this even "liberal".

So, there are ventilators sitting around useless, because there may be needed "in a week or two" and the EU is not able to organize and coordinate the JIT dirstribution of the equipment across the countries?

I tried to explain recursion to my son with the monks from "Towers of Hanoi": What is a monk handing out to the next one? Is he waiting? What is a monk's contribution to the answer? How many monks do we need? What does the last monk do? Which monk gives the answer, the first one or the last one?

Not mentioned in the article: Snakes and Ladders. Was real fun to play with my son, especially coming up with new rules after while.

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

Berkeley Logo (brand new in version 6.1). I have compiled two versions, with and without wx.

The file with the procedures is on github:

https://github.com/pgtan/puzzles/blob/master/baum1.lg

https://github.com/jrincayc/ucblogo-code

But it is also a excellent concatenative (left-to-right) language with brilliant procedure definition mechanism. Here as example, an oneliner to draw ascii christmas tree, we made with the kid last year:

? tanne.print tanne.output tanne.shift tanne.split 19 3 3

I see LOGO also as a kind of (lispy, interactive, left to right!) concatenative langugage. Here is an example, an ASCII christmass tree we made with the kid recently:

    ?  tanne.print tanne.output tanne.shift tanne.split 19 3 3 
             x
            xxx
           xxxx*
          oOOOx
           OxO
          ~oxoOox
         ~~o*o**O
        *o~*~x*OO
       x~Ox*x~~xOx*
        *~ox*x*O*O
       xO~ox~~*~
      oxoxxox~~xx**
     *O*o~OOo~*o**
    ~xOxOx~x*o*x*O
    

just putting something in between:

    ? tanne.print butlast tanne.output tanne.shift tanne.split 19 3 3 
          
         x*
        xxO*
       x*o*Oo
        oo*x
       o~ox~*x
      xOoOOOx*
     **o*xoo
    o***OO**x~

Just make sure, solutions work in both directions.

Yes, LOGO already has all the list evaluating like the real Lisp.

? run `[print ,[sum 2 3]]

5

But also a very sophisticated way to define functions with many default and within even optional parameters without the need of parentheses. From UCBLogo info:

This version of Logo allows variable numbers of inputs to a procedure. After the procedure name come four kinds of things, in this order:

            1.   0 or more REQUIRED inputs    :FOO :FROBOZZ                                    

            2.   0 or more OPTIONAL inputs    [:BAZ 87] [:THINGO 5+9]                          

            3.   0 or 1 REST input            [:GARPLY]                                        

            4.   0 or 1 DEFAULT number        5

LOGO is already Lisp without parentheses and with infix notation. Recently, doing exercises in LOGO with my kid,he asked: can we put some parentheses around the functions for better clearness? I said: my son, you just discovered Lisp!

Prolog gives you backtracking for free and liberates you from loops and if's.

Even simple thing like drawing the Euler spiral has much more effect, if you visualize the turtle motion, so you can see how the motion turns at some point and the turtle starts going back on the same way down.

cs repeat 360 [fd 10 lt product 2 repcount wait 5]

or a variant of David Eisenstat's code:

cs pu setpos [-100 -100] pd repeat 8 [rt 45 repeat 4 [repeat 45 [fd 5 rt 2 wait 1] rt 135]]

of course Logo is LISP, so you can do stuff like

? show map [[x] se sum # x ?REST] [1 2 3]

[[2 2 3] [4 3] [6]]

For me, COBOL is so over-presented in the media among the old (mainframe) lagnuages, but I recently was surprised to see a production mainframe LPAR offering an APL2 interface,and it seems the language is still maintained on zOS[1]. But I never heard of business application written in APL.

1 https://www.ibm.com/support/pages/apl2-whats-new

Not quite the same, but there is a TeX-Font for the initials:

https://ctan.org/pkg/yinit

Yes! If not everything else, Carbon Black is the reason du jour to run away from Windos. Provided, your company allows the use of another OS.

SomaFM's Bagel Radio, Soundcloud, Youtube

my fvwm "desktop" consists for years only of FvwmPager, rclock, and multiple xload running on different machines.

One BIG thing missing: xteddy! It was xteddy shown in parallel on multiple HP 9000 screens in the early 90ies, which sparked my love for UNIX.

http://weber.itn.liu.se/~stegu/xteddy/

see also

https://xteddy.org/

Also xon (very handy for non-ssh users), jwz's xdaliclock and xkeycaps.

Or you can rediscover LOGO, which is LISP to the bones:

? show (map [[x y] [output se :x sum :y #]] [a b c] [10 20 30])

[[a 11] [b 22] [c 33]]

who doesn't?

Page 10/11: -94.7351 etc. is so wrong, my eyes are bleeding! Should be typeset in math mode like $-94.7351$ (or whole column in math) to get at least the minus sign right.

fvwm with FvwmPager: best "desktop" forever!

MetaPost is so underrated. Glad, this project shows the strength of the language.

Speaking of, I'm wondering about the down of LOGO? When and why LOGO went unpopular?

Sadly, he don't understand what LaTeX is and what TeX is. And $$ is a TeX macro, should not be used in LaTeX, the are much better math display environments.

> Microsoft is really big on typography,

you mean that big:

http://www.unics.uni-hannover.de/nhtcapri/quotation-marks.ht...

not even able to provide correct quotation marks!

Please stop!