|Blaine Motsinger 903e3858bd gofmt||1 year ago|
|README.md||1 year ago|
|cases_test.go||1 year ago|
|hamming.go||1 year ago|
|hamming_test.go||1 year ago|
Calculate the Hamming difference between two DNA strands.
A mutation is simply a mistake that occurs during the creation or copying of a nucleic acid, in particular DNA. Because nucleic acids are vital to cellular functions, mutations tend to cause a ripple effect throughout the cell. Although mutations are technically mistakes, a very rare mutation may equip the cell with a beneficial attribute. In fact, the macro effects of evolution are attributable by the accumulated result of beneficial microscopic mutations over many generations.
The simplest and most common type of nucleic acid mutation is a point mutation, which replaces one base with another at a single nucleotide.
By counting the number of differences between two homologous DNA strands taken from different genomes with a common ancestor, we get a measure of the minimum number of point mutations that could have occurred on the evolutionary path between the two strands.
This is called the ‘Hamming distance’.
It is found by comparing two DNA strands and counting how many of the nucleotides are different from their equivalent in the other string.
GAGCCTACTAACGGGAT CATCGTAATGACGGCCT ^ ^ ^ ^ ^ ^^
The Hamming distance between these two DNA strands is 7.
The Hamming distance is only defined for sequences of equal length, so an attempt to calculate it between sequences of different lengths should not work. The general handling of this situation (e.g., raising an exception vs returning a special value) may differ between languages.
You may be wondering about the
cases_test.go file. We explain it in the
To run the tests run the command
go test from within the exercise directory.
If the test suite contains benchmarks, you can run these with the
go test -v --bench . --benchmem
Keep in mind that each reviewer will run benchmarks on a different machine, with different specs, so the results from these benchmark tests may vary.
For more detailed information about the Go track, including how to get help if you’re having trouble, please visit the exercism.io Go language page.
The Calculating Point Mutations problem at Rosalind http://rosalind.info/problems/hamm/
It’s possible to submit an incomplete solution so you can see how others have completed the exercise.