IDEA: interactive_similarity()

[danielemelotti]

Interactive function that allows the user to click points on plot area, the hit esc and:

• Visualize vectors,
• Obtain a data frame of coordinates,
• Obtain a recommendation matrix.

[danielemelotti]

Additionally a function "plot_similarity" would be created to make the plotting possible, and it could also be used to plot the vectors from a given set of data points.