The development version of gnuplot (5.1) now contains a set of fixes,

improvements, and additions to the support for polar coordinates.

Please give them a test and report any problems.

- The r axis now has a full set of range, label, and tic properties

set rrange [min:max]

set log r

set rlabel "R-axis"

set rtics

set grid [no]rtics [no]mrtics

- New commands

"set ttics" and "set mttics" control placement and labeling of tics

around the perimeter of a polar plot

"set border polar" draws a circular solid line at the perimeter

- Use of polar coordinates to position labels, arrows, objects

You can now use the keyword "polar" when specifying coordinates for

any position. For example to place a labeled arrow on a polar plot:

theta = 15; r = 1.23

set arrow 1 from polar 0,0 to polar theta, r

set label 1 at polar theta,r "Current place" offset 1,1

- New demos

http://gnuplot.sourceforge.net/demo_5.1/ttics.html http://gnuplot.sourceforge.net/demo_5.1/solar_path.html- Internal code reorganization

There is now a single utility routine polar_to_xy(theta, r, &x, &y)

to convert from polar coordinates to cartesian coordinates.

It is used for both data input and plot layout. If you add new

code that supports polar coordinates please use this routine.

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