Mat.subMatrix

Undocumented in source. Be warned that the author may not have intended to support it.
struct Mat(T, size_t rowCount, size_t colCount)
Mat!(T, rowCount - n, colCount - m)
subMatrix
(
size_t n
size_t m
)
(
size_t[n] rows
,
size_t[m] cols
)
if (
rowCount - n > 0 &&
colCount - m > 0
)
if (
isNumeric!T &&
rowCount > 0
&&
colCount > 0
)

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