Vector and Matrix mutiplication
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
Moe Joe
am 27 Nov. 2016
Kommentiert: Star Strider
am 27 Nov. 2016
Hi there;
I have a vector A(kx1) and a matrix B (nxk). I need select rows from that correspond to ONES in A, and sum those rows mod2:
Example:
A =[1 0 1 0 1] and
B = [1 0 1 0 1;
1 0 0 1 0;
0 1 1 1 1;
1 1 0 1 1;
0 1 1 0 1];
In this example, I want to add rows that indicates ones in A, i.e. rows of B(1, 3,5) & sum those 3 rows mod2.
Kindly help.
0 Kommentare
Akzeptierte Antwort
Star Strider
am 27 Nov. 2016
I’m not certain that I understand what you want to do.
See if this works:
A = [1 0 1 0 1];
B = [1 0 1 0 1; 1 0 0 1 0; 0 1 1 1 1; 1 1 0 1 1; 0 1 1 0 1];
C = B(logical(A'),:);
Out = mod(sum(C,2),2)
4 Kommentare
Star Strider
am 27 Nov. 2016
That clarifies things. You are actually summing the columns of ‘D’, so that would be ‘sum(D,1)’ (or more simply, ‘sum(D)’) rather than ‘sum(D,2)’ that would sum the rows.
So the desired result would be:
Out = mod(sum(D),2)
or in my code:
Out = mod(sum(C),2)
producing the result described by (5).
Weitere Antworten (0)
Siehe auch
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!