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managing two variables in sum function

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Fred
Fred 2013-2-10
回答： Steven Lord 2020-2-6
Hi, I want to manage two variables in a sum function in a way that sum(i*cos(ik)); which i=1:N , k=1:M but I want only want the SUM with respect to i and create a vector which has M values in other way i should be sumed but k only takes a value each time. what can I do? If I should use loops how can I do that? Thanks in advance

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-2-10
N=10;
M=20;
ii=1:N
for k=1:M
som(k)=sum(ii.*cos(ii*k));
end

更多回答（1 个）

Steven Lord
Steven Lord 2020-2-6
Use element-wise operations to create a matrix of data to sum then call sum with a dimension input.
[c, r] = meshgrid(1:5, 1:6);
M = c.^r
sum(M, 1) % Sum down columns
sum(M, 2) % Sum along rows

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