rec = matrix(1:12, 4, 3)
tall = matrix(1:21, 7, 3)
wide = matrix(1:21, 3, 7)
sqr = matrix(1:9, 3, 3)
is_rectangular_matrix(rec) # TRUE
is_rectangular_matrix(sqr) # FALSE
is_not_rectangular_matrix(sqr) # TRUE
is_tall_matrix(tall) # TRUE
is_tall_matrix(wide) # FALSE
is_tall_matrix(sqr) # FALSE
is_wide_matrix(wide) # TRUE
is_wide_matrix(tall) # FALSE
is_wide_matrix(sqr) # FALSE
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