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find sum of each row

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Giannakis Stoukas
Giannakis Stoukas 2015-3-21
评论： Star Strider 2015-3-22
Hello,i have a vector named dem(101) and a matrix routes(21,14) that has inside the numbers 1,2,3,4 etc. for example the first row of the matrix is the routes(1,14)=[1 21 25 26 28 30 31 29 24 23 22 48 1]. I want to save to a matrix named load(21) the sum of every route by the vector dem.For example i want the load(1)=sum(dem[1] dem[21] dem[25] dem[26]...... etc)

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Star Strider
Star Strider 2015-3-21
I don’t understand your matrix structure, but this will do the calculation you described:
dem = randi(25, 1, 101);
routes = [1 21 25 26 28 30 31 29 24 23 22 48 1];
load = sum(dem(routes));
This illustrates the details of the addressing:
dem_routes = dem(routes); % Check
I include it for illustration only. It is not part of the code.
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Giannakis Stoukas
Giannakis Stoukas 2015-3-22
Yes i had one zero element without noticing it.Thank you for your respond
Star Strider
Star Strider 2015-3-22
My pleasure!
It should work without the zero element.

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