You should choose a distance/similarity that makes sense for your problem.

Different problems require different approaches and expertise.

A bar chart or bar graph is a chart that presents Grouped data with rectangular bars with lengths proportional to the values that they represent.

postscript is older format but it resizes well.

The principal components are equal to the right singular values if you first scale the variables.

knitr converts markdown document in to html by default.

lwd is used for line width.

Code and text is in one place.

Save data in NON proprietary formats to make work reproducible.

Object-oriented programming is a programming language model organized around objects rather than "actions and data rather than logic.