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For another explanation of how to use doParallel along with examples of code and documentation about the rest of the package's functionality, please visit this link.
doParallel Example:
Here's what the example is doing at important lines of code:
1) We import the doParallel library
4)/5) We create a lot of trials of R data for testing
Note: The middle part here (7-15) tests the baseline performance on one core before we use multiple cores as a benchmark test of the speed-up from parallel processing.
17) We create a cluster to run our job in parallel over
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