How to Create Binary Table in MATLAB Elegantly

num_digits = 3;
bit_divisor = 2.^(0:num_digits-1); 
bit = zeros(2^num_digits,num_digits);
for combination = 0 : 2^num_digits - 1,
    for nd = 1:num_digits,
        % just bit shift to right and mask the right-most bit
        bit(combination+1,num_digits-nd+1) = rem(floor(combination/bit_divisor(nd)), 2)
end % combination loop

Create Raspberry Pi as A DLNA Media Center

OS : Raspbian

Access Point

1. Install the following
sudo apt-get install hostapd isc-dhcp-server iptables wpasupplicant

2. Configure AP Daemon
sudo nano /etc/hostapd/hostapd.conf
interface=wlan0    #wlan0 will be working in AP mode
ssid=Your_AP_SSID  #your AP SSID
channel=1          #WiFi channel used by AP 
# WPA and WPA2 configuration
macaddr_acl=0      #indicates that you do not use MAC address allow/deny list
auth_algs=1        #indicates algorithm specified by IEEE 802.11
ignore_broadcast_ssid=0 #AP will broadcast SSID
#WPA settings
wpa=2              #WPA algorithm used (WPA2 in this case)
wpa_passphrase=my_secret_pass #AP password
wpa_key_mgmt=WPA-PSK #WPA key mangement type
wpa_pairwise=TKIP #encription algorithm
rsn_pairwise=CCMP #encription algorithm
#Hardware configuration
driver=rtl871xdrv     #type of driver to be used (in may be different depending on your WiFi dongle chipset)
                      #in majority of cases it will be driver=nl80211 <-- use this for Buffalo Wifi USB dongle
ieee80211n=1          #Whether IEEE 802.11n (HT) is enabled
hw_mode=g             #WPS RF Bands (a = 5G, b = 2.4G, g = 2.4G, ag = dual band)

##Note : for Buffalo Wifi USB dongle (Ralink RT8070)

3. set up /etc/hostapd/hostapd.conf as the configuration file
sudo nano /etc/default/hostapd

4. configure the network settings for clients connecting to AP
sudo nano /etc/dhcp/dhcpd.conf
ddns-update-style none;   #DDNS disabled
default-lease-time 600; #IP lease time
max-lease-time 7200;
subnet netmask { #AP Subnet definition
  range  ; #Range of IP addresses available for clients 
  option broadcast-address;
  option routers; #your client's gateway / router IP
  option domain-name "local-network"; #optional domain name
  option domain-name-servers,; #your DNS IP

5. set up DHCP server configuration file
sudo nano /etc/default/isc-dhcp-server

6. configure wlan0 for static IP adress (the same as router IP in dhcpd.conf file)
sudo nano /etc/network/interfaces
auto lo

iface lo inet loopback
iface eth0 inet dhcp

allow-hotplug wlan0
iface wlan0 inet static
up iptables-restore < /etc/iptables.ipv4.nat

7. setting up Network Address Translation (NAT). Turn on packet forwarding in /etc/sysctl.conf
sudo nano /etc/sysctl.conf

8. start the translation right away by running:
sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"

9. setting up the actual translation between the ethernet port called eth0 and the wireless card called wlan0
sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
sudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT

10. save the setting
sh -c "iptables-save > /etc/iptables.ipv4.nat"

11. In order to start AP on boot run the following commands:
sudo update-rc.d hostapd enable 
sudo update-rc.d isc-dhcp-server enable

12. When you got trouble with the dhcp server, restarting both hostapd and isc-dhcp-server on start up
sudo nano /etc/rc.local
--- add these line : ---
sudo service hostapd stop
sudo service isc-dhcp-server stop
sudo ifdown wlan0
sudo ifup wlan0
sudo service hostapd restart
sudo service isc-dhcp-server restart
13. reboot

DLNA Server

1. install :
sudo apt-get install minidlna

2. configure :
sudo nano /etc/minidlna.conf
# port for HTTP (descriptions, SOAP, media transfer) traffic 

#Specify paths to directories containing digital media.

friendly_name=Media Server 








3. start / restart the service
sudo service minidlna force-reload

References :

Setup Raspberry Pi As A Media Server

OS : Raspbian
1. install the server: sudo apt-get install minidlna
2. create media folder : mkdir /media/stream/Videos
3. updload file to the folder
4. set /etc/minidlna.conf . media_dir=V,/media/stream/Videos . to set DLNA automatically index new media : inotify=yes
5. reload : sudo service minidlna force-reload

To check the server: "IP_Address":8200. The webpage should show the number of content files in the server database.

Hide number on axis in a plot on MATLAB


How to make extRoot for openwrt on TL MR3040 v2

Preliminary : Upgrade firmware
  - Grab the firmware from here:
  - From command line :
     cd /tmp
     sysupgrade -n -v openwrt-ar71xx-generic-tl-mr3040-v2-squashfs-sysupgrade.bin

Preliminary : Format your flash drive with an ext4 or ext3 filesystem.
for example format from your PC:

Install Packages:
root@OpenWrt:~# opkg update
root@OpenWrt:~# opkg install kmod-usb-storage kmod-fs-ext4 block-mount
Find the name of your flash drive with the : block info
root@OpenWrt:~# block info
/dev/mtdblock2: UUID="20ad40ea-d33a421e-785b7d2d-ada99230" VERSION="4.0" TYPE="squashfs" /dev/mtdblock3: TYPE="jffs2"
/dev/sda2: UUID="9fa36631-ac09-42a0-b090-f61efe6c1bfb" NAME="EXT_JOURNAL" VERSION="1.0" TYPE="ext4"

Create a directory and mount your device on it:
root@OpenWrt:~# mkdir -p /mnt/flash
root@OpenWrt:~# mount -t ext4 /dev/sda2 /mnt/flash

Copy the router's internal flash to the flash drive :
root@OpenWrt:~# mkdir -p /tmp/cproot
root@OpenWrt:~# mount --bind / /tmp/cproot
root@OpenWrt:~# tar -C /tmp/cproot -cvf - . | tar -C /mnt/flash -xf -
root@OpenWrt:~# umount /tmp/cproot

Edit /etc/config/fstab file :
root@OpenWrt:~# vi /etc/config/fstab

config global
                option delay_root 1

config global automount
  option from_fstab 1
  option anon_mount 1

config global autoswap
  option from_fstab 1
  option anon_swap 0

config mount
  option target   /
  option device   /dev/sda2
  option fstype   ext4
  option options  rw,sync
  option enabled  1
  option enabled_fsck 0

config swap
  option device   /dev/sda1
  option enabled  1

Enable and Start fstab :
root@OpenWrt:~# /etc/init.d/fstab enable
root@OpenWrt:~# /etc/init.d/fstab start

Restart the router :
root@OpenWrt:~# reboot -f

After booting and login, check the mount point:
root@OpenWrt:~# mount

You should see that /dev/sda2 has been mounted on /
root@OpenWrt:~# mount
rootfs on / type rootfs (rw)
/dev/root on /rom type squashfs (ro,noatime)
proc on /proc type proc (rw,noatime)
sysfs on /sys type sysfs (rw,noatime)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,noatime)
/dev/sda2 on / type ext4 (rw,relatime,data=ordered)
tmpfs on /dev type tmpfs (rw,relatime,size=512k,mode=755)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
debugfs on /sys/kernel/debug type debugfs (rw,noatime)

How to Sort a Vector With the Same Order As Other Vector in Matlab

Example :
A = [5 3 4 1 2];
B = [-6 -8 -7 -10 -5];
Answer :
C = sortrows([A.' B.']);
[A, idx] = sort(A);
B = B(idx);