saving multiplications with zeros in a loop
2 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
D_coder
am 13 Sep. 2018
Kommentiert: D_coder
am 14 Sep. 2018
%if true
for i iterations
Matrix = Matrix.*phase %Matrix has lot of zeros I want to skip multiplications with zero. Is it possible to do it in a single line without using if else or any loops
%end
Please dont use sparse, both matrix and phase are two-dimensional array
0 Kommentare
Akzeptierte Antwort
Walter Roberson
am 13 Sep. 2018
Mask = Matrix ~= 0;
for i iterations
Matrix(mask) = Matrix(mask) * phase ;
end
This assumes that phase is a scalar nonzero value. It does not apply if phase is a vector or 2d array.
If phase is a 2d array then
phases = sparse(phase) ;
Matrix = sparse(Matrix) ;
for i iterations
Matrix = Matrix * phases;
end
Or better yet,
Matrix = sparse(Matrix) * (phase^iterations) ;
with no loop.
4 Kommentare
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Creating and Concatenating Matrices finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!