numpy techniques(DRAFT)

https://stackoverflow.com/questions/2350072/custom-data-types-in-numpy-arrays

https://numpy.org/devdocs/reference/routines.array-creation.html

Homebrew tips(DRAFT)

HomebrewでdoctorしたらWarning: "config" scripts exist outside your system or Homebrew directories.となった時の対応方法


ultiple side-by-side versions with Homebrew?
https://stackoverflow.com/questions/7751222/multiple-side-by-side-versions-with-homebrew


「sslが原因でpipをアップデートできなかった」
https://qiita.com/penpenpen/items/7e8ebbf933e90b95f6b3

https://stackoverflow.com/questions/62785290/installing-previous-versions-of-a-formula-with-brew-extract

https://qiita.com/arashida/items/091a018e0574f8469286

https://cmichel.io/how-to-install-an-old-package-version-with-brew/

features2d classes in OpenCV(DRAFT)

OpenCV implements various key point detectors and descriptors as subclasses of features2d class.

But it is not clear at once whether such a subclass can detect key points and compute descriptors or can only one of them.

The below list summarizes such distinction, plus some minor notes.

• Features including No. 10(AffineFeature2D) and below are implemented in xfeatures2d class in the opencv contrib module.
• Source path is relative to "opencv/modules/features2d".
• 
  

No	Class name	detect	compute	detectAndCompute	Source	Notes
1	AgastFeatureDetector	o	x	x	agast.cpp	transforms to gray image.
2	AKAZE	x	x	o	akaze.cpp	Depends on the channels?
3	BRISK	x	x	o	brisk.cpp	transforms to gray image.
4	FastFeatureDetector	o	x	x	fast.cpp
5	GFTTDetector	o	x	x	gftt.cpp
6	KAZE	x	x	o	kaze.cpp	transforms to gray image.
7	MSER	o	x	x	mser.cpp	implementation differes fro gray and color image.
8	ORB	x	x	o	orb.cpp	transforms to gray image. based on FastFeatureDetector
9	SimpleBlobDetector	o	x	x	blobdetector.cpp	transforms to gray image.
10	AffineFeature2D
11	BoostDesc	x	o	x	boostdesc.cpp	transforms to gray image.
12	BriefDescriptorExtractor
13	DAISY	x	o	x	daisy.cpp
14	FREAK	x	o	x	freak.cpp
15	HarrisLaplaceFeatureDetector
16	LATCH	x	o	x	latch.cpp

https://docs.opencv.org/3.0-beta/doc/py_tutorials/py_feature2d/py_table_of_contents_feature2d/py_table_of_contents_feature2d.html
https://github.com/opencv/opencv/tree/master/modules/features2d/src

https://docs.opencv.org/4.1.0/d0/d13/classcv_1_1Feature2D.html#a8be0d1c20b08eb867184b8d74c15a677

"This algorithm is patented and is excluded in this configuration; Set OPENCV_ENABLE_NONFREE CMake option and rebuild the library in function 'create'"

GCC

https://www.cs.oberlin.edu/~kuperman/help/make.html

https://latedev.wordpress.com/2014/04/22/common-c-error-messages-2-unresolved-reference/

https://appuals.com/fix-cannot-execute-binary-file-exec-format-error-ubuntu/

https://www.commentcamarche.net/forum/affich-17553555-error-exec-format-error

https://archive.org/details/B-001-002-835

https://www3.ntu.edu.sg/home/ehchua/programming/cpp/gcc_make.html

http://www.cplusplus.com/forum/unices/142922/

https://www.includehelp.com/c-programs/id-returned-1-exit-status-undefined-reference-to-main-error-in-c.aspx

https://openclassrooms.com/forum/sujet/probleme-error-ld-returned-1-exit

https://helpmanual.io/help/g++/

https://www.slothparadise.com/c-libraries-linking-compiling/

https://www.mail-archive.com/search?l=libunwind-devel@nongnu.org&q=subject:%22%5C%5BLibunwind%5C-devel%5C%5D+Backtrace+performance+on+x86%5C-64+based+on+Dwarf%09info%22&o=newest&f=1

https://www.slothparadise.com/c-libraries-linking-compiling/

https://cs.baylor.edu/~donahoo/tools/gdb/tutorial.html

https://stackoverflow.com/questions/33837828/c-c-passing-macros-that-take-arguments-on-the-compile-line

https://www.systutorials.com/131/convert-string-to-int-and-reverse/

https://cs.baylor.edu/~donahoo/tools/gdb/tutorial.html

http://perso.ens-lyon.fr/daniel.hirschkoff/C_Caml/docs/doc_gdb.pdf

https://web.eecs.umich.edu/~sugih/pointers/summary.html

https://news.ycombinator.com/item?id=14733829

https://ubuntuforums.org/showthread.php?t=1983130

https://www.cs.bu.edu/teaching/cpp/writing-makefiles/