pointwise multiplication of sparse matrix with full array
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Sandra Martinez
am 12 Dez. 2022
Kommentiert: Sandra Martinez
am 13 Dez. 2022
How can I do this operation?
A=sparse([1 0;0 0]);
B=rand(2,2,2,2);
C=A.*B;
the only way is converting B into a sparse array with this function?
remark: A is sparse but B is not.
0 Kommentare
Akzeptierte Antwort
Torsten
am 12 Dez. 2022
Bearbeitet: Torsten
am 12 Dez. 2022
rand(2,2,2,2) generates a (2x2x2x2) array for B. You cannot multiply A with such a B elementwise because the array sizes don't match.
A=sparse([1 0;0 0]);
B=rand(2,2);
C=A.*B
Or what do you expect as result for B being (2x2x2x2) ?
2 Kommentare
Torsten
am 12 Dez. 2022
@Sandra Martinez comment moved here:
Yes, I know. But if A is a full matrix this is possible ( in that case matlab makes the pointwisemultiplicación of B(: , : , i,j) with A, for each i,j) The problem here is with a sparse matix and pointwise multiplication
Weitere Antworten (1)
Sandra Martinez
am 13 Dez. 2022
2 Kommentare
Torsten
am 13 Dez. 2022
The author of ndSparse (Matt J) is active in this forum.
Maybe you should open a new question where ndSparse is part of the title and ask him directly.
Siehe auch
Kategorien
Mehr zu Language Fundamentals 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!