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Entropy/Narcissist: Difference between revisions
Added Rust
(Added Algol 68) |
(Added Rust) |
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Line 648:
4.885234973253878
</pre>
=={{header|Rust}}==
<lang Rust>use std::fs::File;
use std::io::{Read, BufReader};
fn entropy<I: IntoIterator<Item = u8>>(iter: I) -> f32 {
let mut histogram = [0u64; 256];
let mut len = 0u64;
for b in iter {
histogram[b as usize] += 1;
len += 1;
}
histogram
.iter()
.cloned()
.filter(|&h| h > 0)
.map(|h| h as f32 / len as f32)
.map(|ratio| -ratio * ratio.log2())
.sum()
}
fn main() {
let name = std::env::args().nth(0).expect("Could not get program name.");
let file = BufReader::new(File::open(name).expect("Could not read file."));
println!("Entropy is {}.", entropy(file.bytes().flatten()));
}</lang>
{{out}}
<pre>Entropy is 5.7108583.</pre>
=={{header|Sidef}}==
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