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r-source
Read-only mirror of R source code from https://svn.r-project.org/R/, updated hourly. See the build instructions on the wiki page.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I wouldn't say that for loops are outdated, per se. As others have noted, vectorized functions in R are typically much faster than writing a standard for loop, but it's important to note that these functions are at their core for loops written in a compiled language like C. For example, the function lapply() used to apply a function to each element of a list in R is actually a wrapper for a function with a loop written in C. But don't take my word for it! Check out some of the underlying source code written in C for the apply() family of functions here.