"Place" in Environmental Epidemiology: A Rectangular Coordinate Method

Optimal in-place transposition of rectangular matrices

Given a rectangular m × n matrix stored as a two-dimensional array, we want to transpose it in place andmeasure the cost by the number of memory writes and the number of auxiliary cells used. We propose a transposition algorithm with optimal complexity O(mn) using only min(m, n) auxiliary memory cells. © 2009 Elsevier Inc. All rights reserved.

In-Place Transposition of Rectangular Matrices

We present a new Algorithm for In-Place Rectangular Transposition of an m by n matrix A that is efficient. In worst case it is O(N logN) where N = mn. It uses a bit-vector of size IWORK words to further increase its efficiency. When IWORK=0 no extra storage is used. We also review some of the other existing algorithms for this problem. These contributions were made by Gower, Windley, Knuth, Mac...

Environmental epidemiology: An introduction

The place of epidemiology in environmental decisions: needed support for the development of risk assessment policy.

Some of the most challenging problems in the use of epidemiology for regulatory policy concern summarizing epidemiological and other kinds of information to create a weight of evidence. Another frequent issue is whether to embark on epidemiological study. There are also concerns that negative results never see the light of day. These and other meta-issues are worthy of funded evaluation by expe...

a new method for coordinate transformation between conformal map projections

geospatial information system (gis) has emerged as a very powerful tool for capturing, storing, analyzing, managing, and presenting data that is linked to location. the location information, which is usually obtained from existing maps or the global positioning systems (gps), refers to different coordinate and map projection systems. therefore, unification of the coordinate and mapping systems ...