opening ports

/sbin/iptables -I INPUT -p tcp --destination-port 6881:6999 -j ACCEPT

Interactive Font Size Adjustment in Emacs. About time.

(defun sacha/increase-font-size ()
 (interactive)
 (set-face-attribute 'default
                     nil
                     :height
                     (ceiling (* 1.10
                                 (face-attribute 'default :height)))))
(defun sacha/decrease-font-size ()
 (interactive)
 (set-face-attribute 'default
                     nil
                     :height
                     (floor (* 0.9
                                 (face-attribute 'default :height)))))
(global-set-key (kbd "C-+") 'sacha/increase-font-size)
(global-set-key (kbd "C--") 'sacha/decrease-font-size)

idx =(a>0) % returns 1 if true, 0 otherwise

A=magic(4) % create a matrix
[r,c,v]=find(A>10) %get indices + vector of elements satisfying the conditions

N=(A>3) % produce matrix with same dimensions as A, with 1 and zeros according to condition

pretty(expression)
%and
latex(expression) % as the names suggest