Transforms X and Y coordinates with a Qt-style transformation matrix. The advantage over direct use of Qt is vectorization.
qvmap(m, x, y)
A matrix encoding the transformation, or something
coercible to a matrix, like a C++
X coordinates; if
Y coordinates, optional
The mapped coordinates, as a two column (X, Y) matrix,
y is missing, in which case an attempt is made to
coerce the result to the class of
x, if any.
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