ashwin’s gists

ashwin / rotate_point_opencv.cpp

Created June 16, 2015 09:58

Rotate point in OpenCV

	cv::Point2f RotatePoint(const cv::Point2f& p, float rad)
	{
	const float x = std::cos(rad) * p.x - std::sin(rad) * p.y;
	const float y = std::sin(rad) * p.x + std::cos(rad) * p.y;

	const cv::Point2f rot_p(x, y);
	return rot_p;
	}

	cv::Point2f RotatePoint(const cv::Point2f& cen_pt, const cv::Point2f& p, float rad)

ashwin / getconf_vars.txt

Created June 4, 2015 09:59

getconf variables that I find useful

	# Note: These are on my system. Values will vary on your system.

	# Bits occupied by primitive types
	CHAR_BIT 8
	LONG_BIT 64

	# Limits of signed types
	CHAR_MAX 127
	CHAR_MIN -128
	INT_MAX 2147483647

ashwin / eigen_opencv.cpp

Created June 2, 2015 09:51

Eigen vectors and eigen values in OpenCV

	#include <opencv/cv.h>

	// Input mat: 100 6-dimensional points
	// Rows: 100 Cols: 6 Type: CV_F32
	cv::Mat pt_mat;

	cv::PCA pt_pca(pt_mat, cv::Mat(), CV_PCA_DATA_AS_ROW, 0);

	// Mean
	// Rows: 1 Cols: 6

ashwin / eclipse_exclude.xml

Created June 2, 2015 09:03

XML code added by Eclipse CDT on excluding a zoomba directory

	<filteredResources>
	<filter>
	<id>1433235573506</id>
	<name></name>
	<type>30</type>
	<matcher>
	<id>org.eclipse.ui.ide.multiFilter</id>
	<arguments>1.0-name-matches-false-false-zoomba</arguments>
	</matcher>
	</filter>

ashwin / gist:0e05b37aa13126669ee2

Created May 21, 2015 09:48

Empty recycle bin of all users in Windows

C:> rd /s C:\$Recycle.Bin

ashwin / doi_to_bibtex.sh

Created May 6, 2015 11:54

Get BibTeX from DOI passed as input

	#!/bin/bash

	url="http://dx.doi.org/"$1
	curl -LH 'Accept: application/x-bibtex' $url

ashwin / set_asciidoctor_themes.vim

Created May 4, 2015 05:50

Set themes directory for ASCIIDoctor in Vim

	" Set themes directory for ASCIIDoctor in Vim
	let g:asciidoctor_themes_dir='~/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/asciidoctor-1.5.2/data/stylesheets'

ashwin / set_asciidoc_compiler.vim

Created May 4, 2015 05:48

Set compiler in Vim for ASCIIDoc files

	" Vim-Asciidoc plugin sets compiler by default to asciidoc
	" Here we set it to asciidoctor
	autocmd Filetype asciidoc compiler asciidoctor

ashwin / async_example.cpp

Last active March 3, 2023 23:18

How to use async threads in C++

	#include <future>

	float DoWork(int idx)
	{
	// Do some hard computation using idx
	// and internal read-only data structures
	// Return the float result
	}

	void DoAsync()

ashwin / nvidia_panic.txt

Created March 30, 2015 12:44

Kernel panic error seen on display with NVIDIA driver

	BUG: unable to handle kernel NULL pointer dereference at (null)
	IP: [<ffffffff8172762b>] __down_common+0x4c/0x144
	PGD 608b48067 PUD 60ba27067 PMD 0
	Oops: 0002 [#1] SMP
	Modules linked in: ath3k btusb bluetooth mxm_wmi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel arc4 kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul ath9k glue_helper ablk_helper cryptd ath9k_common ath9k_hw joydev ath mac80211 serio_raw snd_hda_intel(+) rtsx_pci_ms lpc_ich(+) snd_seq_midi memstick cfg80211 snd_seq_midi_event snd_hda_codec snd_hwdep snd_rawmidi snd_pcm parport_pc snd_page_alloc snd_seq mei_me(+) mei ppdev snd_seq_device snd_timer snd nvidia(POX+) lp i915(+) parport video drm_kms_helper soundcore wmi drm mac_hid shpchp i2c_algo_bit hid_generic usbhid hid rtsx_pci_sdmmc ahci r8169 psmouse libahci mii rtsx_pci
	CPU: 0 PID: 527 Comm: nvidia-persiste Tainted: P OX 3.13.0-44-generic #73-Ubuntu
	Hardware name: Notebook W35xSTQ_370ST

Ashwin Nanjappa ashwin