how to extract rows and leave zeros behind?
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
MAHMOUD ALZIOUD
am 11 Nov. 2017
Kommentiert: MAHMOUD ALZIOUD
am 11 Nov. 2017
Dear All, I have a big matrix called A, I extract another matrix from this A and call it B based on a condition of the value x in the matrix A, I wrote this code but it doesnt work well, can any body please help fix it? I need to extract the new matrix B and leave the rows as zeros in the original matrix A.
B= A(x(:,1)>9.84 & x(:,1)<12.47 , :);
A(find(A(B,:)))=0;
0 Kommentare
Akzeptierte Antwort
Walter Roberson
am 11 Nov. 2017
B= A(x(:,1)>9.84 & x(:,1)<12.47 , :);
leaves B as a subset of A, having selected some of the rows but retaining all columns.
A(B,:)
then uses that subset as an index into A. That is mostly going to fail as the entries are probably not zero.
Try
mask = x(:,1)>9.84 & x(:,1)<12.47;
B = A(mask, :);
A(mask, :) = 0;
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Matrices and Arrays 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!