Sponsorised links
This month
Sponsorised links
April 2008
Graphs of Functions and Algebra - Interactive Tutorials
by knann
(via)
Free tutorials using java applets to explore, interactively, important topics in precalculus such as quadratic, rational, exponential, logarithmic, trigonometric, polynomial, absolute value functions and their graphs. Equations of lines, circles, ellipses, hyperbolas and parabolas are also explored interactively. Graph shifting, scaling and reflection are also included. The definition and properties of inverse functions are thoroughly investigated. A graphical approach to 2 by 2 systems of equations is included.
March 2008
Ghoti.nl: PSP tutorials, games
by yakari35
(via)
Good bunch of tutorials to start coding for the PSP
Jointures multiples dans ActiveRecord grâce à include
by roulian
ActiveRecord facilite énormément la manipulation des relations entre les objets. Cependant, lorsque ces relations se complexifient, il n’est pas toujours évident de récupérer les données qui nous intéressent.
L’argument :include de la méthode find est souvent utilisé pour réduire le nombre de requêtes SQL à effectuer. Nous allons voir qu’en l’associant avec l’argument :conditions, elle permet également d’effectuer des requêtes complexes.
