Re: [Gnuplot-info] Multiple individual dotted lines

[Hans-Bernhard B. <br...@ph...>]

Hamish Allan wrote:

> Using PCA I can determine the vectors of the principle components. Then 
> I want to plot lines for those vectors, which should bisect one another 
> on the diagram. First question: I'd like those lines to have arrowheads 
> on each end (so that they look like axes). How can I achieve this?

"help arrow"

> Second question: I can create a second 2D dataset which is the 
> projection of the original datapoints onto the principle component, so 
> that they all lie on the line of the principle component. I would like 
> to draw dotted or dashed lines between each original datapoint and its 
> new position. It's not clear to me how I would best achieve this. Can 
> anyone give me any advice?

Doing it with a second dataset would not be a good idea --- you need all 
the data in *one* dataset, to make this plot.  See "help vectors"
and the documentation about extended "using" specifications.