Convert medical measurements between International Standard (SI) and US 'Conventional' Units.
Table of conversions between Intertional Standard (SI) and US 'Conventional' Units for common medical measurements.
Bind two data frames into a multivariate data frame
Map elements of a vector according to the provided 'cases'
Column-bind objects with different number of rows
Combine R Objects With a Column Labeling the Source
Display Information about Elements in a Given Object
Return first or last element of an object
Various R programming tools for data manipulation
Get date/time parts from date and time objects
Print Byte Size in Human Readable Format
Install perl modules needed for read.xls to support Excel 2007+ XLSX format
Interleave Rows of Data Frames or Matrices
Run Multiple is.* Tests on a Given Object
Remove All Objects, Except Those Specified
Return the leftmost or rightmost columns of a matrix or dataframe
Select columns names matching certain critera
Compute the Number of Non-missing Observations
Remove or rename variables in a dataframe
Consistent Random Samples and Permutations
Count or list sheet names in Excel spreadsheet files.
Determine if a character string "starts with" with the specified characters.
Remove leading and trailing spaces from character strings
Trim a vector such that the last/first value represents the sum of trimmed values
Change unknown values to NA and vice versa
Convert a matrix into a vector, with appropriate names
Extract or replace the upper/lower triangular portion of a matrix
Create multivariate data by a given factor
Check which file formats are supported by read.xls