From 1017a2614c1708bac638fec5108b5dc83729f760 Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Tue, 2 Apr 2019 20:36:52 +0200
Subject: some new stuff

---
 .../00030_Computer-Games/00150_TU-Racer/index.md   |   7 +-
 .../00030_Computer-Games/00200_Inside-Out/index.md |  20 ++++
 .../00200_Inside-Out/insideout.mp4                 | Bin 0 -> 1669010 bytes
 .../00200_Inside-Out/insideout.webm                | Bin 0 -> 1000359 bytes
 .../00008_Computer-Science-Literature/index.md     |   1 -
 .../00010_Links-and-Literature/index.md            |   3 +-
 00_blog/00040_Haskell/00020_GHC-Notes/index.md     |  30 ++---
 .../00040_Convex-and-Concave-Hulls/alpha.png       | Bin 0 -> 555961 bytes
 .../00040_Convex-and-Concave-Hulls/index.md        |  20 ++++
 00_blog/00040_Haskell/00040_Graham-Scan/index.md   | 128 ---------------------
 .../00040_Haskell/00220_Neural-Networks/index.md   |   7 ++
 .../00240_FFI-Foreign-Function-Interface/index.md  |  19 +++
 12 files changed, 88 insertions(+), 147 deletions(-)
 create mode 100644 00_blog/00030_Computer-Games/00200_Inside-Out/index.md
 create mode 100644 00_blog/00030_Computer-Games/00200_Inside-Out/insideout.mp4
 create mode 100644 00_blog/00030_Computer-Games/00200_Inside-Out/insideout.webm
 create mode 100644 00_blog/00040_Haskell/00040_Convex-and-Concave-Hulls/alpha.png
 create mode 100644 00_blog/00040_Haskell/00040_Convex-and-Concave-Hulls/index.md
 delete mode 100644 00_blog/00040_Haskell/00040_Graham-Scan/index.md
 create mode 100644 00_blog/00040_Haskell/00240_FFI-Foreign-Function-Interface/index.md

(limited to '00_blog')

diff --git a/00_blog/00030_Computer-Games/00150_TU-Racer/index.md b/00_blog/00030_Computer-Games/00150_TU-Racer/index.md
index 0fa52b7..b6fd943 100644
--- a/00_blog/00030_Computer-Games/00150_TU-Racer/index.md
+++ b/00_blog/00030_Computer-Games/00150_TU-Racer/index.md
@@ -5,10 +5,11 @@ My top rated Game Project from University Times implemented for the
 legendary _Computergraphik_ II & III Courses.
 
 You participate in deadly races around the Technical University, as well
-as in psychodelic worlds to earn money for your tuition fees, which the 
-Austrian government just invented. (back then in 00s...)
+as in some psychodelic worlds to earn money for your tuition fees, which the 
+Austrian government just invented, back then in the 2000s. :smile:
 
-The game is using a custom game engine based on raw OpenGL. 
+The game and physics use a custom engine based on raw OpenGL, which was
+written from scratch.
 
 <video controls>
 <source src="turacer.mp4" type="video/mp4">
diff --git a/00_blog/00030_Computer-Games/00200_Inside-Out/index.md b/00_blog/00030_Computer-Games/00200_Inside-Out/index.md
new file mode 100644
index 0000000..f179141
--- /dev/null
+++ b/00_blog/00030_Computer-Games/00200_Inside-Out/index.md
@@ -0,0 +1,20 @@
+    June 2018
+# Inside Out
+
+This simple game is the fruit of my first experiments with the cross-platform
+2D/3D game engine Godot. Godot targets PC, mobile and web platforms.
+
+
+<video controls>
+<source src="insideout.mp4" type="video/mp4">
+<source src="insideout.webm" type="video/webm">
+    Sorry, Your browser does not support the video tag.
+
+</video>
+
+## Ref
+* <https://godotengine.org/>
+
+<!--
+source code locally in ~/miguel/nogit/godot_inside_out/
+-->
diff --git a/00_blog/00030_Computer-Games/00200_Inside-Out/insideout.mp4 b/00_blog/00030_Computer-Games/00200_Inside-Out/insideout.mp4
new file mode 100644
index 0000000..46eabbb
Binary files /dev/null and b/00_blog/00030_Computer-Games/00200_Inside-Out/insideout.mp4 differ
diff --git a/00_blog/00030_Computer-Games/00200_Inside-Out/insideout.webm b/00_blog/00030_Computer-Games/00200_Inside-Out/insideout.webm
new file mode 100644
index 0000000..080ffb8
Binary files /dev/null and b/00_blog/00030_Computer-Games/00200_Inside-Out/insideout.webm differ
diff --git a/00_blog/00035_Programming/00008_Computer-Science-Literature/index.md b/00_blog/00035_Programming/00008_Computer-Science-Literature/index.md
index 114294e..c850f0c 100644
--- a/00_blog/00035_Programming/00008_Computer-Science-Literature/index.md
+++ b/00_blog/00035_Programming/00008_Computer-Science-Literature/index.md
@@ -26,7 +26,6 @@ This is a list of some books, focusing on topics around computer science, which
 * Linux Device Drivers (O’REILLEY, by Corbert, Rubini, Kroah-Hartman)
 * Linux Kernel in a Nutshell (O’REILLEY,  Greg Kroah-Hartman)
 * Concrete Math (2nd)
-* STOC '83 Proceedings of the fifteenth annual ACM symposium on Theory of computing / Primitives for the manipulation of general subdivisions and the computation of Voronoi diagrams
 * sedgewick & waynes algorithms
 * books from appendix, from programming from ground up?
 
diff --git a/00_blog/00040_Haskell/00010_Links-and-Literature/index.md b/00_blog/00040_Haskell/00010_Links-and-Literature/index.md
index b09733d..4ede8c0 100644
--- a/00_blog/00040_Haskell/00010_Links-and-Literature/index.md
+++ b/00_blog/00040_Haskell/00010_Links-and-Literature/index.md
@@ -1,10 +1,11 @@
 # Haskell - Books, Links and Papers
 
-A growing collection of external links and books concerning Haskell.
+A growing collection of external links and books concerning (or tangent to) Haskell.
 
 * **Learn You a Haskell** for Great Good by Marian Lipovaca
 * **Real World Haskell** by Bryan O'Sullivan, Don Stewart, and John Goerzen
 * **Parallel and Concurrent Programming in Haskell** by Simon Marlow
+* **Category Theory for Programmers** by Bartosz Milewski
 * **Haskell Wiki** <https://wiki.haskell.org>
 * **UPENN CIS 194** <https://www.seas.upenn.edu/~cis194/spring13/>
 * **What I Wish I Knew When Learning Haskell** by Stephen Diehl <http://dev.stephendiehl.com/hask/>
diff --git a/00_blog/00040_Haskell/00020_GHC-Notes/index.md b/00_blog/00040_Haskell/00020_GHC-Notes/index.md
index c945319..acee63f 100644
--- a/00_blog/00040_Haskell/00020_GHC-Notes/index.md
+++ b/00_blog/00040_Haskell/00020_GHC-Notes/index.md
@@ -2,33 +2,35 @@
 
 ## Some GHC Flags
 
-        -v			verbose mode
-        -O2			level 2 optimizations
-        -rtsopts		allow +RTS flags
-        -prof			enable basic time and allocation profiling
-        -auto-all		cost centers on all top level functions
-         			(you can also add them via the SCC pragma)
-        -caf-all      	        generate data for CAFs (constant applicative forms)
-        -fforce-recomp 	        force recompilation
+        -v                      verbose mode
+        -O2                     level 2 optimizations
+        -rtsopts                allow +RTS flags
+        -prof                   enable basic time and allocation profiling
+        -auto-all               cost centers on all top level functions
+                                (you can also add them via the SCC pragma)
+        -fprof-auto             replaced -auto-all
+        -caf-all                generate data for CAFs (constant applicative forms)
+        -fprof-cafs             replaced -caf-all
+        -fforce-recomp          force recompilation
         -threaded               Use threaed runtime
         -eventlog               enables +RTS -l flag
 
         -Wall
         -Werror
 
+        -no-hs-main             supress linking main module
+
         Notes: you will obtain the profiling versions of dependancies via: 
                stack install --profile [libraryname]
 
-               -fprof-auto replaced -auto-all
-               -fprof-cafs replaced -caf-all
 
 ## Some +RTS flags
 
-        -K 	set stack limit
+        -K      set stack limit
         -s      statistic reporting
-        -p	profiling
-        -hc 	extract heap profile
-        -hy	allocation by type
+        -p      profiling
+        -hc     extract heap profile
+        -hy     allocation by type
         -hd     allocation by constructor
         -ix     x is sampling frequency in seconds. e.g. 0.01)
         -Nx     x is number of cores to utilize
diff --git a/00_blog/00040_Haskell/00040_Convex-and-Concave-Hulls/alpha.png b/00_blog/00040_Haskell/00040_Convex-and-Concave-Hulls/alpha.png
new file mode 100644
index 0000000..a8cbe34
Binary files /dev/null and b/00_blog/00040_Haskell/00040_Convex-and-Concave-Hulls/alpha.png differ
diff --git a/00_blog/00040_Haskell/00040_Convex-and-Concave-Hulls/index.md b/00_blog/00040_Haskell/00040_Convex-and-Concave-Hulls/index.md
new file mode 100644
index 0000000..d68abcd
--- /dev/null
+++ b/00_blog/00040_Haskell/00040_Convex-and-Concave-Hulls/index.md
@@ -0,0 +1,20 @@
+    December 2017
+# Calculating Convex and Concave Hulls
+
+Experimenting with Convex and Concave Hulls with Haskell
+
+## Concave
+
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+SVG generated via Graham Scan
+
+## Convex
+![](alpha.png){}\
+Alpha Shapes and Concave Hulls obtained from the delaunay triangulation
+
+## Ref
+
+* STOC '83 Proceedings of the fifteenth annual ACM symposium on Theory of computing / Primitives for the manipulation of general subdivisions and the computation of Voronoi diagrams
+
+## Git
+* <https://gitweb.softwarefools.com/?p=miguel/haskell.git;a=tree;f=hulls>
diff --git a/00_blog/00040_Haskell/00040_Graham-Scan/index.md b/00_blog/00040_Haskell/00040_Graham-Scan/index.md
deleted file mode 100644
index 195dbe1..0000000
--- a/00_blog/00040_Haskell/00040_Graham-Scan/index.md
+++ /dev/null
@@ -1,128 +0,0 @@
-Haskell – Convex Hull – Graham Scan
-===================================
-
-December 16, 2017
-
-Playing with Convex Hulls (via Graham Scan) and SVG Export in Haskell:
-
-This is an embedded SVG generated by the Haskell programm below:
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-
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ {.haskell .numberLines}
----------------------------------------------------------------------------------------------
---
--- GRAHAM SCAN IMPLEMENTATION
---
--- This little haskell programm calulates the Convex Hull for a set of 2D points.
--- It ships wit a main function that feeds the Graham Scan algorithm with some
--- random points and generates a simple SVG of the input points and resulting envelope.
--- A simple SVG encoder is included.
---
--- Alogrithm used: https://en.wikipedia.org/wiki/Graham_scan
---
--- CREDITS --
---
--- Michal Idziorek <m.i@gmx.at> 
--- 16 December 2017
---
----------------------------------------------------------------------------------------------
- 
-import Data.List 
-import System.Random
- 
----------------------------------------------------------------------------------------------
- 
--- GRAHAM SCAN --
- 
--- Three points are clockwise if ccw < 0.
-ccw (p1x,p1y) (p2x,p2y) (p3x,p3y) = (p2x - p1x)*(p3y - p1y) - (p2y - p1y)*(p3x - p1x)
- 
--- Calculate the slope defined by 2 points. (return Infinity, if points are identical).
-slope (ax,ay) (bx,by) | (ax,ay ) == (bx,by)   = 1/0 -- Infinity
-                      | otherwise             = (bx-ax)/(by-ay)
- 
--- Comparison function to sort points counterclockwise (given a reference point).
-slope_cmp a b c =  compare (slope a c) (slope a b)
- 
--- Comparison function using the y and x coordinates for ordering.
-graham_cmp (ax,ay) (bx,by) | ay /= by = compare ay by
-                           | otherwise = compare ax bx
- 
--- Graham scan on prepared data. this will calculate the convex hull.
-graham_calc [] hs                                       = hs
-graham_calc (x1:xs) hh               | length(hh)   < 2 = graham_calc xs (x1:hh)
-graham_calc xx@(x1:xs) hh@(h1:h2:hs) | ccw x1 h1 h2 < 0 = graham_calc xs (x1:hh)
-                                     | otherwise        = graham_calc xx (h2:hs)
- 
--- Find the starting point, sort all points counterclockwise and perform the graham scan.
-graham xs = graham_calc sortedPoints  []
-            where minPoint     = minimumBy graham_cmp xs
-                  sortedPoints = sortBy (slope_cmp minPoint) xs 
- 
----------------------------------------------------------------------------------------------
- 
--- XML ENCODING--
- 
-xml_attr  (x:xs)       = x++"=\""++(head xs)++"\" "
-xml_enc tag attrs body = "<"++tag++" "++xml_attrs++">"++body++"</"++tag++">"
-                         where xml_attrs = unlines $ map xml_attr attrs
- 
--- SVG ENCODING --
- 
--- hardcoded scaling and panning function
-svg_transf x = x*30+5
- 
-line_to_svg ((x1,y1),(x2,y2)) = xml_enc "line" [["x1",show lx1],["y1",show ly1],
-                                                ["x2",show lx2],["y2",show ly2],
-                                                ["style",  "stroke:rgb(255,0,0);stroke-width:2"]] ""
-                                where lx1=svg_transf x1
-                                      lx2=svg_transf x2
-                                      ly1=svg_transf y1
-                                      ly2=svg_transf y2
- 
-point_to_svg (x,y) = xml_enc "circle" [["cx",show cx],["cy",show cy],["r","5"],
-                                       ["fill","rgb(30,150,"++(show (floor dist))++")"]] ""
-                     where cx=svg_transf x
-                           cy=svg_transf y
-                           dist= (sqrt ((x-5)*(x-5) + (y-5)*(y-5)))*255/8
- 
- 
- 
--- draws SVG points and lines (in hardcoded sizes and colors)
-svg_draw p l = xml_enc "svg" [style,["width","330"],["height","330"]] body
-               where style = ["style",
-                               "background-color:black;border:3px solid green;margin:2px;"]
-                     body  = (unlines (map point_to_svg p )) ++
-                             (unlines (map line_to_svg l )) 
- 
--- calculate convex hull and generate svg
-svg_graham xs = svg_draw xs (zip hull hull_open)
-                where hull_open  = graham xs
-                      hull       = (last hull_open) : hull_open 
- 
--- RANDOMIZING --
- 
-randomPoints g cnt = take cnt (zip r10a r10b)
-                       where r5 = randomRs (0,5) g :: [Double]
-                             r10a =zipWith (+) r5 (drop cnt r5)
-                             r10b =zipWith (+) (drop (2*cnt) r5) (drop (3*cnt) r5)
- 
----------------------------------------------------------------------------------------------
- 
--- MAIN --
- 
--- Note that this is the only place of impurity in this source-file.
--- Is is subject to side effects due to I/O (we are writng to stdout)
--- and the random number generator.
-main = do
-           g <- newStdGen
-           putStr (svg_graham (randomPoints g 25))
-           putStr (svg_graham (randomPoints g 50))
-           putStr (svg_graham (randomPoints g 100))
-           putStr (svg_graham (randomPoints g 250))
-           putStr (svg_graham (randomPoints g 500))
-           putStr (svg_graham (randomPoints g 1500))
- 
----------------------------------------------------------------------------------------------
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/00_blog/00040_Haskell/00220_Neural-Networks/index.md b/00_blog/00040_Haskell/00220_Neural-Networks/index.md
index 16b39d0..e298046 100644
--- a/00_blog/00040_Haskell/00220_Neural-Networks/index.md
+++ b/00_blog/00040_Haskell/00220_Neural-Networks/index.md
@@ -64,6 +64,12 @@ yourself familiar with, when learning about neural networks.
 * backpropagation (based on 4 fudnamental equations / check proofs)
 * weighted input
 * saturated neuron
+* softmax
+* log-likehood
+* overfitting
+* hyper-parameters
+* validation data
+* regularization (l1,l2,dropout)
 
 ## Git Repo
 
@@ -75,3 +81,4 @@ yourself familiar with, when learning about neural networks.
 * [2] <http://yann.lecun.com/exdb/mnist/>
 * [3] <http://www.deeplearningbook.org/>
 * [4] <https://medium.com/tebs-lab/how-to-classify-mnist-digits-with-different-neural-network-architectures-39c75a0f03e3>
+* [5] <https://adeshpande3.github.io/adeshpande3.github.io/The-9-Deep-Learning-Papers-You-Need-To-Know-About.html>
diff --git a/00_blog/00040_Haskell/00240_FFI-Foreign-Function-Interface/index.md b/00_blog/00040_Haskell/00240_FFI-Foreign-Function-Interface/index.md
new file mode 100644
index 0000000..892f4cd
--- /dev/null
+++ b/00_blog/00040_Haskell/00240_FFI-Foreign-Function-Interface/index.md
@@ -0,0 +1,19 @@
+    March 2019
+# Haskell - Foreign Function Interface
+
+Haskell's FFI allows easily to cooperate with other languages. Foreign functions can call Haskell code and vice versa.
+Simple examples can be found in my git repository [1]. For now, the provided Makefile exposes two interesting targets: 
+
+* **c\_from\_hask** - simple program with a C function called from Haskell.
+* **hask\_from\_c** - simple programm with a Haskell function called from C.
+
+The next step is to pass more complicated structures via _ForeignPtr_'s.
+
+## Notes
+
+* since version 8.4 GHC guarantees that garbage collection will never occur during an unsafe call.
+
+## Ref
+* [1] <https://gitweb.softwarefools.com/?p=miguel/haskell.git;a=tree;f=ffi>
+* [2] <https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/ffi-chap.html#>
+* [3] <https://wiki.haskell.org/Foreign_Function_Interface>
-- 
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