How to sum up different values of a matrix?
4 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
Hello,
I have a matrix A containing 1000 values. I want to calculate the cumsun of the element 1 to 10, 10 to 20, 20 to 30 etc.I dont want to use a loop (for or when). Only matrix maipluation formulas.
Can you advise how I could do that?
0 Commenti
Risposte (2)
dpb
il 10 Ott 2016
Modificato: dpb
il 11 Ott 2016
doc arrayfun % and hide the looping construct (but it's still there)
ADDENDUM
Actually, "what was I thinking?" :) Besides the wrong function name, while can do it that way, "the Matlab way" is
windowSize = 1000;
cumsum=conv(data,ones(1,windowSizend),'valid');
The sum is nothing but the mean w/o being normalized by the number of elements in the window.
2 Commenti
Kwin
il 11 Ott 2016
You can reshape the matrix such that it MATLAB only calculates the cumsum of the appropriate values:
B = cumsum(reshape(A, 10, length(A)/10))';
But if A is not a single row, you might have to do some addition reshaping to ensure that each sequence of data is in its own column (and maybe add some zeros is to make sure that the row length you are splitting up is a multiple of 10.
1 Commento
dpb
il 11 Ott 2016
B = cumsum(reshape(A, 10, length(A)/10))';
This is good place for the empty braces idiom...
B=cumsum(reshape(A, 10, []).';
Vedere anche
Categorie
Scopri di più su Numeric Types in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!