Calculate the x coordinates given a branch of dendrogram

`cal_total_length`

is a code modified from plot.dendrogram()
to calculate the total length of lines to draw a dendrogram. This
function was developed to evaluate the use of ink for visualization.

1 |

`x` |
A dendrogram object. |

output The total length.

1 2 3 4 5 6 7 8 9 10 11 | ```
#generate sample data
set.seed(1234); par(mar=c(0,0,0,0))
x <- rnorm(10, mean=rep(1:5, each=2), sd=0.4)
y <- rnorm(10, mean=rep(c(1,2), each=5), sd=0.4)
dataFrame <- data.frame(x=x, y=y, row.names=c(1:10))
#calculate Euclidian distance
distxy <- dist(dataFrame)
#hierachical clustering "complete" linkage by default
hc <- hclust(distxy)
total_length <- cal_total_length(as.dendrogram(hc))
``` |

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