flashClust

https://www.rdocumentation.org/packages/flashClust/versions/1.1-4

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A fast implementation of hierarchical clustering that incorporates original code from Fionn Murtagh,...

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### Install flashClust Package

Source: https://www.rdocumentation.org/packages/flashClust/versions/1.1-4

Use this command to install the flashClust package from CRAN. Ensure you have a working internet connection.

```bash
install.packages('flashClust')
```

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### flashClust vs. hclust Performance Comparison

Source: https://www.rdocumentation.org/packages/flashClust/versions/1.1-4/topics/flashClust

Compares the execution time of flashClust and the standard R stats::hclust function on a randomly generated distance matrix. It also verifies the equality of the resulting cluster objects, excluding the 'call' component.

```R
set.seed(1);
nNodes = 2000;

# Random "distance" matrix
dst = matrix(runif(n = nNodes^2, min = 0, max = 1), nNodes, nNodes);

# Time the flashClust clustering
system.time( {
   h1 = hclust(as.dist(dst), method= "average");
  } );

# Time the standard R clustering
system.time( {
   h2 = stats::hclust(as.dist(dst), method = "average");
  } );

all.equal(h1, h2)
# What is different:

h1[[6]]
h2[[6]]

# Everything but the 'call' component is the same; in particular, the trees are exactly equal.
```

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