RegionArea

RegionArea[pts] returns the number of elements in the region given by list pts.

RegionArea[roi] returns the area of the region specified by graphics primitive roi.

The default option setting UnsignedValue → True returns positive values of area only. When set to False, polygonal areas may be positive or negative depending on the ordering of the vertices.

See also User's Guide 7.5.

Modified in Version 2.2.

Example

This loads the package.

In[1]:=

Here is a list of 2-tuples defining a closed region on a discrete grid.

In[2]:=

Out[2]=

This returns the number of elements in the region.

In[3]:=

Out[3]=

This returns the area of the region.

In[4]:=

Out[4]=

This returns a negative value for the area of the polygon.

In[5]:=

Out[5]=

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