This function is used to access a type IntervalMatrix from the List.
i1 : l = {{interval(1,2), interval(2,3)},{interval(3,4),interval(1,3)}}
o1 = {{[1, 2], [2, 3]}, {[3, 4], [1, 3]}}
o1 : List
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i2 : m = intervalMatrix l
o2 = {{[1, 2], [2, 3]}, {[3, 4], [1, 3]}}
o2 : IntervalMatrix
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The object intervalMatrix is a method function.