kindly give me the matlab code of APIT or Centroid localization algo at my id:
spsingh.iitr[at]rediffmail.com

wireless sensor networks can be used in many fields of application. The location of the sensor nodes, which is the basis for other applications, is to determine the auto-position using some system of location, according to the anchor nodes. In this article, an in-depth analysis for the approximate test point in triangulation (APIT) algorithm is made, and an improvement of it is proposed. The analysis shows: compared to the original, the improvement algorithm reduces the probabilities of error In-To-Out and Out - To - In the original error and the theory more perfectly appeared.