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updates make,gnuplot,sqlite,raytracing
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‎editor/debugging/gdb.org‎

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@@ -71,6 +71,7 @@
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| set | $1 = 4 | sets a gdb variable |
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| set | args 1 2 3 | sets "run" arguments |
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| set | var x=15 | sets a program variable |
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| set | x = 15 | |
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| set | pagination off | |
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| (i)nfo | registers | |
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| x/i | $pc | |
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- can include a variable name
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- can reference previous results with "$N"
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- can include multiple vars, if they are the same size, surrounded by {a,b}
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*** e(x)amine
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‎editor/debugging/valgrind.org‎

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* gotchas
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- works only gcc (?

‎gamedev/graphics/raytracing.org‎

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@@ -196,6 +196,7 @@ https://www.youtube.com/watch?v=NIAUFnNZGhE
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#+end_src
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* Book: The Ray Tracer Challenge
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- Bonus Chapters http://www.raytracerchallenge.com/#bonus
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- Errata https://pragprog.com/cms/errata/jbtracer-errata/
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- Cofactor 4x4
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- usage of _init() for structs
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- unions for vec3
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** 0 Article
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https://medium.com/@jogrosso/the-ray-tracer-challenge-learning-c-through-computer-graphics-e45a68fb7cd5
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- source C++ https://github.com/joseph-grosso/ray-tracer-challenge
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- perlin C++ https://raw.githubusercontent.com/Reputeless/PerlinNoise/refs/heads/master/PerlinNoise.hpp
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- OpenMP for threads
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- Matrix https://eigen.tuxfamily.org/index.php?title=Main_Page
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- perf
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#+begin_src sh
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sudo perf record -F 999 -a -g -- ./build/challenges/challenge.out && \
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sudo perf script > out.perf && \
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../FlameGraph/stackcollapse-perf.pl out.perf > out.folded && \
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../FlameGraph/flamegraph.pl out.folded > kernel.svg && \
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google-chrome ./kernel.svg
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#+end_src
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** 1 Tuples
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*** Types

‎languages/compiled/makefile/self.org‎

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@@ -202,24 +202,24 @@ https://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html
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*** strings
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https://www.gnu.org/software/make/manual/html_node/Text-Functions.html
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|------------+---------------+-------------------------------------------|
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| <c> | <c> | |
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| | | returns |
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|------------+---------------+-------------------------------------------|
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| word | n,text | text[n] |
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| wordlist | n,m,text | text[n:m] |
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| firstword | text | text[0] |
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| lastword | text | text[-1] |
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| words | text | len(text) |
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|------------+---------------+-------------------------------------------|
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| findstring | needle,text | "needle" or "" if not in text |
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| filter | pat%...,text | remove words that match "pat%" |
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| filter-out | pat%...,text | remove words that do NOT match "pat%" |
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| sort | text | sort words, remove dups |
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| strip | text | trim and squash whitespaces |
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| subst | from,to,text | substitute literal words |
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| patsubst | pat,repl,text | substitute pattern% words, text can use * |
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|------------+---------------+-------------------------------------------|
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|------------+---------------+---------------------------------------|
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| <c> | <c> | |
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| | | returns |
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|------------+---------------+---------------------------------------|
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| word | n,text | text[n] |
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| wordlist | n,m,text | text[n:m] |
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| firstword | text | text[0] |
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| lastword | text | text[-1] |
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| words | text | len(text) |
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|------------+---------------+---------------------------------------|
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| findstring | needle,text | find |
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| filter | pat%...,text | remove |
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| filter-out | pat%...,text | remove-if-not |
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| sort | text | sort+dedup |
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| strip | text | trim and squash whitespaces |
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| subst | from,to,text | literal substitution |
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| patsubst | pat,repl,text | pattern% substitution, text can use * |
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|------------+---------------+---------------------------------------|
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*** filenames
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https://www.gnu.org/software/make/manual/html_node/File-Name-Functions.html
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|-----------+---------------+-------------------------------------------------|

‎languages/sql/sqlite/self.org‎

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* cli
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- https://www.sqlite.org/cli.html (TODO 6)
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- $ sqlite3 :memory: # or just not pass any argument
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#+begin_src sh
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$ sqlite3 :memory: # or just not pass any argument
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$ sqlite3 foo.db 'SELECT * FROM events'
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$ sqlite3 foo.db .dump
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#+end_src
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** metacomands
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|------------+-------------------+---------------------------------------------------|
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| group_concat | x[,sep] | "," is used if sep(arator) is ommited |
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| string_agg | x ,sep | alias of group_concat(x,sep) |
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|--------------+---------+-------------------------------------------------------|
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*** Window
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https://sqlite.org/windowfunctions.html
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** Foreign Keys
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https://www.sqlite.org/foreignkeys.html
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‎terminal/tools/visualization/gnuplot/self.org‎

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|-------+------------------------------------|
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** options (setteable)
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#+CAPTION: S = a quoted string, N = a number
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|------------+-------------------+----------------------------------|
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| <c> | <c> | |
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| | argument | description |
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|------------+-------------------+----------------------------------|
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| border | [N] | axis lines |
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| [x¦y]tics | [nomirror¦rotate] | axis numbers |
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| [x¦y]label | S | axis label |
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| [x¦y]range | [N:N] | axis range |
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| grid | - | axis grid |
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| key | [LR] [[no]box] | the box with key labels |
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|------------+-------------------+----------------------------------|
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| samples | N | ???? |
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| xdata | time | tells x axis is a date/time |
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| encoding | utf8 | |
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| timefmt | S | format of the INPUT date |
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| datafile | separator S | input separator (default: space) |
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|------------+-------------------+----------------------------------|
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| title | S | the |
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| format | [x¦y] FMT | tic format string |
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| logscale | [x¦y] [N] | with step N |
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| autoscale | [[x¦y]fix] | prevents autoextend of scale |
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| output | S | saves into filepath at S |
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| style | fill transparent | |
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| | solid F | |
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| | noborder | |
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| | data lines | |
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|------------+-------------------+----------------------------------|
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| pause | N | seconds to pause |
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| +reread+ | - | REMOVED in 6.0 +reread input+ |
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|------------+-------------------+----------------------------------|
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|--------------+-------------------+----------------------------------|
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| <c> | <c> | |
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| | argument | description |
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|--------------+-------------------+----------------------------------|
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| border | [N] | axis lines |
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| [x¦y¦z]tics | [nomirror¦rotate] | axis numbers |
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| [x¦y¦z]label | S | axis label |
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| [x¦y¦z]range | [N:N] | axis range |
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| grid | - | axis grid |
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| key | [LR] [[no]box] | the box with key labels |
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|--------------+-------------------+----------------------------------|
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| samples | N | ???? |
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| xdata | time | tells x axis is a date/time |
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| encoding | utf8 | |
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| timefmt | S | format of the INPUT date |
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| datafile | separator S | input separator (default: space) |
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|--------------+-------------------+----------------------------------|
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| title | S | the |
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| format | [x¦y] FMT | tic format string |
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| logscale | [x¦y] [N] | with step N |
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| autoscale | [[x¦y]fix] | prevents autoextend of scale |
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| output | S | saves into filepath at S |
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| style | fill transparent | |
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| | solid F | |
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| | noborder | |
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| | data lines | |
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|--------------+-------------------+----------------------------------|
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| pause | N | seconds to pause |
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| +reread+ | - | REMOVED in 6.0 +reread input+ |
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|--------------+-------------------+----------------------------------|
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** plot
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- plot
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- /dev/stdin

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