p = [[0,0],[0,0],[0,0]].
I know that len(p) returns the width of a list but how do I get the height of a list which is 3 in this case?
p = [[0,0],[0,0],[0,0]]. I know that len(p) returns the width of a list but
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p = [[0,0],[0,0],[0,0]].
I know that len(p) returns the width of a list but how do I get the height of a list which is 3 in this case?
There’s no such thing as a “height” of a list. You probably mean “when we choose to represent a matrix as a list-of-lists, what is the height of the matrix”? (sidenote: There are many ways to represent matrices.)
You could take the first row:
but you’d run into an error if you had
[], so what you want is:(Other things to keep in mind: if it’s acceptable to have an Nx0 matrix represented like
[[],[],[],...]. I’d say no. Is[]how you represent empty matrices? I’d say yes. However some libraries likenumpychose differently:numpy.matrix([]).tolist()–>[[]]andnumpy.matrix([[],[],[]])–>matrix([], shape=(3, 0), dtype=float64).)