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# Nucleotide Count Given a DNA string, compute how many times each nucleotide occurs in the string. DNA is represented by an alphabet of the following symbols: 'A', 'C', 'G', and 'T'. Each symbol represents a nucleotide, which is a fancy name for the particular molecules that happen to make up a large part of DNA. Shortest intro to biochemistry EVAR: - twigs are to birds nests as - nucleotides are to DNA and RNA as - amino acids are to proteins as - sugar is to starch as - oh crap lipids I'm not going to talk about lipids because they're crazy complex. So back to nucleotides. DNA contains four types of them: adenine (`A`), cytosine (`C`), guanine (`G`), and thymine (`T`). RNA contains a slightly different set of nucleotides, but we don't care about that for now. ## Installation See [this guide](https://github.com/exercism/xr/blob/master/docs/INSTALLATION.md) for instructions on how to setup your local R environment. ## How to implement your solution In each problem folder, there is a file named `<exercise_name>.R` containing a function that returns a `NULL` value. Place your implementation inside the body of the function. ## How to run tests Inside of RStudio, simply execute the `test_<exercise_name>.R` script. This can be conveniently done with [testthat's `auto_test` function](https://www.rdocumentation.org/packages/testthat/topics/auto_test). Because exercism code and tests are in the same folder, use this same path for both `code_path` and `test_path` parameters. On the command-line, you can also run `Rscript test_<exercise_name>.R`. ## Source The Calculating DNA Nucleotides_problem at Rosalind [http://rosalind.info/problems/dna/](http://rosalind.info/problems/dna/) ## Submitting Incomplete Solutions It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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