Calculating Non-zero Average

If I have a variable where row A is timeline with index t and B are calculated values, how to calculate Non-zero Average of Values in B?

A	1	2	3	4	5
B	4	0	6	0	7

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@vishweshpatil , you can use the $ operator to do that as

Mean$(i, B(i))

or

Mean(i|B(i), B(i))

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