Coupling R and PHREEQC: Efficient Programming of Geochemical Models

Modules based on the geochemical model PHREEQC for use in scripting and programming languages

The geochemical model PHREEQC is capable of simulating a wide range of equilibrium reactions between water and minerals, ion exchangers, surface complexes, solid solutions, and gases. It also has a general kinetic formulation that allows modeling of nonequilibrium mineral dissolution and precipitation, microbial reactions, decomposition of organic compounds, and other kinetic reactions. To faci...

Comparison of the programming models for considering risk in farm planning:application of utility-efficient programming

Efficient R Programming

1 Pitfalls These brief exercises are meant to illustrate some common obstacles to efficient R programming. The idea is that you’ll follow along with the text, evaluating the instructions in your own R session. The basic scenario is a genome-wide association study. There are 1000 individuals. Case versus control status, gender, and age were recorded for each, along with genotype at ≈100000 SNPs....

Efficient R Programming

R has been developed with a strong focus on interactive data analysis using a read-evalprint loop (REPL), and many operations have been optimized for convenient interactive use rather than for computational performance. As data grows bigger and more complex, this consequently leads more and more often to situations where runtime or memory consumption are road blocks in the data analysis. Furthe...

Estimating the Efficient Portfolio in Non-Radial DEA and DEA-R Models

The portfolio is a perfect combination of stock or assets, which an investor buys them. The objective of the portfolio is to divide the investment risk among several shares. Using non-parametric DEA and DEA-R methods can be of great significance in estimating portfolio. In the present paper, the efficient portfolio is estimated by using non-radial DEA and DEA-R models. By proposing non-radial m...