plotting two measured variables against each others

[lukyicheung]

Hi,

I would be interested in an additional function which plots two measured variables, so to say f(x) against g(x). So far, one can only plot the measured variables against set parameters x: f(x) or g(x).

Another feature, which is important in some cases, is to make the x- and y- axis ratio 1:1. If plottr could offer these, it will be super good!

Best, Lukyi