R-universe search: exports:velocity

Showing 7 of total 7 results (show query)

drizopoulos

JMbayes2:Extended Joint Models for Longitudinal and Time-to-Event Data

Fit joint models for longitudinal and time-to-event data under the Bayesian approach. Multiple longitudinal outcomes of mixed type (continuous/categorical) and multiple event times (competing risks and multi-state processes) are accommodated. Rizopoulos (2012, ISBN:9781439872864).

Maintained by Dimitris Rizopoulos. Last updated 25 days ago.

competing-risks longitudinal-analysis mixed-models multi-state personalized-medicine precision-medicine prediction-model survival-models openblas cpp openmp

84 stars 8.27 score 264 scripts 2 dependents

thomasp85

particles:A Graph Based Particle Simulator Based on D3-Force

Simulating particle movement in 2D space has many application. The 'particles' package implements a particle simulator based on the ideas behind the 'd3-force' 'JavaScript' library. 'particles' implements all forces defined in 'd3-force' as well as others such as vector fields, traps, and attractors.

Maintained by Thomas Lin Pedersen. Last updated 4 months ago.

d3js graph-layout network network-visualization particles simulation cpp

119 stars 7.19 score 43 scripts

cneyens

raem:Analytic Element Modeling of Steady Single-Layer Groundwater Flow

A model of single-layer groundwater flow in steady-state under the Dupuit-Forchheimer assumption can be created by placing elements such as wells, area-sinks and line-sinks at arbitrary locations in the flow field. Output variables include hydraulic head and the discharge vector. Particle traces can be computed numerically in three dimensions. The underlying theory is described in Haitjema (1995) <doi:10.1016/B978-0-12-316550-3.X5000-4> and references therein.

Maintained by Cas Neyens. Last updated 7 months ago.

analytic-element-model groundwater groundwater-modelling hydrogeology hydrology

8 stars 5.68 score 6 scripts

edm44

hydraulics:Basic Pipe and Open Channel Hydraulics

Functions for basic hydraulic calculations related to water flow in circular pipes both flowing full (under pressure), and partially full (gravity flow), and trapezoidal open channels. For pressure flow this includes friction loss calculations by solving the Darcy-Weisbach equation for head loss, flow or diameter, plotting a Moody diagram, matching a pump characteristic curve to a system curve, and solving for flows in a pipe network using the Hardy-Cross method. The Darcy-Weisbach friction factor is calculated using the Colebrook (or Colebrook-White equation), the basis of the Moody diagram, the original citation being Colebrook (1939) <doi:10.1680/ijoti.1939.13150>. For gravity flow, the Manning equation is used, again solving for missing parameters. The derivation of and solutions using the Darcy-Weisbach equation and the Manning equation are outlined in many fluid mechanics texts such as Finnemore and Maurer (2024, ISBN:978-1-264-78729-6). Some gradually- and rapidly-varied flow functions are included. For the Manning equation solutions, this package uses modifications of original code from the 'iemisc' package by Irucka Embry.

Maintained by Ed Maurer. Last updated 4 months ago.

9 stars 4.95 score 8 scripts

shirintaheri

climetrics:Climate Change Metrics

A framework that facilitates spatio-temporal analysis of climate dynamics through exploring and measuring different dimensions of climate change in space and time.

Maintained by Shirin Taheri. Last updated 12 months ago.

15 stars 3.88 score 9 scripts

albandelavenne

transfR:Transfer of Hydrograph from Gauged to Ungauged Catchments

A geomorphology-based hydrological modelling for transferring streamflow measurements from gauged to ungauged catchments. Inverse modelling enables to estimate net rainfall from streamflow measurements following Boudhraâ et al. (2018) <doi:10.1080/02626667.2018.1425801>. Resulting net rainfall is then estimated on the ungauged catchments by spatial interpolation in order to finally simulate streamflow following de Lavenne et al. (2016) <doi:10.1002/2016WR018716>.

Maintained by Alban de Lavenne. Last updated 10 days ago.

fortran openmp

3.48 score 6 scripts

hvillalo

satin:Visualisation and Analysis of Ocean Data Derived from Satellites

With 'satin' functions, visualisation, data extraction and further analysis like producing climatologies from several images, and anomalies of satellite derived ocean data can be easily done. Reading functions can import a user defined geographical extent of data stored in netCDF files. Currently supported ocean data sources include NASA's Oceancolor web page <https://oceancolor.gsfc.nasa.gov/>, sensors VIIRS-SNPP; MODIS-Terra; MODIS-Aqua; and SeaWiFS. Available variables from this source includes chlorophyll concentration, sea surface temperature (SST), and several others. Data sources specific for SST that can be imported too includes Pathfinder AVHRR <https://www.ncei.noaa.gov/products/avhrr-pathfinder-sst> and GHRSST <https://www.ghrsst.org/>. In addition, ocean productivity data produced by Oregon State University <http://sites.science.oregonstate.edu/ocean.productivity/> can also be handled previous conversion from HDF4 to HDF5 format. Many other ocean variables can be processed by importing netCDF data files from two European Union's Copernicus Marine Service databases <https://marine.copernicus.eu/>, namely Global Ocean Physical Reanalysis and Global Ocean Biogeochemistry Hindcast.

Maintained by Héctor Villalobos. Last updated 11 months ago.

avhrr copernicus ghrsst modis

4 stars 3.30 score 9 scripts