Double sum is just the sum of two sums. Use double sums if the items of the sum have two indices and you wish to add each index separately.
One sum can be created by combining two sums whose indices of summation and summands perfectly line up. We must then specify how each component of the summing expression changes as a result of that change in variables. beginning index. n = 0 is equivalent to k = 1.
summationResult=DoubleSum in the function (s,t)
summationResult=0;
first summation limit (i= 1 to s) for i=1:
Limit on summing for j=1:t%seconds (j= 1 to t)
summationResult = (i*j) + summationResult;
end
end
end
Learn more about index here-
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