Dear all -

[I'm writing under the influence of a (so long) mild attack of big C, so beg your pardon if reads a bit incoherently in places.]

When plotting a unit circle (using pd commands and options) I got disappointed again as it looked like a ballon from last weeks birthday party.

I then remembered this threat from yesteryear
http://www.jsoftware.com/pipermail/programming/2021-February/057582.html

where Bill wrote:
"I think it's ok to have different axis length, but the unit of each axis
should have the same physical length. Is this a bug in qt output only?"

And somewhat later:
"The hexagon has vertices on x axis but the flat side on y axis. the
distance between opposite vertices is longer than the distance between
opposite sides."

As I checked myself, it's not a problem of qt output only, but also visible in print.

The option 'aspect' which was suggested as a remedy (using a value of 0.866, which -for reasons unknown to me- is suspiciously close to -:%:3) has probably more to do with the aspect of the plotted grid (and if so, in a weird way, at least one I do not fully understand).

And I wondered whether there should be an additional pd option labelled something like

   'units ratio'   or      'compression ratio'

where a value of 1 would force identical unit lengths on both the vertical and horizontal axis.

I must admit that I'm not current on that issue, might have missed any further discussion (if there was one).

-M





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