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====== Len ======
###
You can use the # operator to get the number of rows and columns of a matrix
###
===== Example =====
==== Input ====
A = Matrix.New({{1,2},{3,4},{5,6}})
print("number of rows in A = ",#A)
print("number of cols in A = ",#A[1])
==== Result ====
number of rows in A = 3
number of cols in A = 2
===== Table of contents =====
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