how to write this range in Matlab?

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NMK
NMK 2016-7-21
回答： Steven Lord 2016-7-21
how do we write the following type of range in matlab:
∑_jϵN=m_nj
i.e. j lies in N.
Thanks.
  2 个评论
Walter Roberson
Walter Roberson 2016-7-21
It looks to me as if it might be the sum over those j that are elements of (N = m) to (N = n), with the term to be summed being j ?

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回答（2 个）

Walter Roberson
Walter Roberson 2016-7-21
I am going to guess that this is
sum(N(N >= m & N <= n))
Steven Lord
Steven Lord 2016-7-21
Use linear indexing.
% Generate sample data
x = (1:20).^2;
% Generate a set N over which to sum
N = randperm(20, 5)
% Compute the sum over the set N
sumXN = sum(x(N))
% Since the kth element of x is just k^2, check by summing N^2
% Use .^ to perform element-wise squaring
sumN2 = sum(N.^2)
sumXN and sumN2 should be the same.

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