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cartogram 0.4.0

The new n_cpu option in cartogram_cont() and cartogram_ncont() enables distortion calculation across multiple CPU cores (thanks to e-kotov!)
The default threshold value in cartogram_cont() will now automatically increase if the weighting variable contains a significant number of zeros.
Additional tests have been implemented.

cartogram 0.3.0

Remove sp, rgdal and maptools from examples and suggestions.
cartogram_cont() has a new parameter verbose = FALSE to hide print of size error on each iteration.

cartogram 0.2.2

Fix geometry replacement in cartogram_ncont

cartogram 0.2.0

Migrated all functions to sf, fixed problems with multipolygons.
cartogram functions won't accept features with longitude/latitude coordinates anymore.

cartogram 0.1.1

Update sf code. Thanks to @Nowosad for speeding things up!

cartogram 0.1.0

Non-Overlapping Circles Cartogram (Dorling)

cartogram 0.0.3

sf support added

cartogram 0.0.2

Non-contiguous Area Cartogram
Prepare data with missing or extreme values before cartogram calculation for faster convergence

cartogram 0.0.1

Initial Release