Make very small numbers in complex matrix zero
8 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
format shortG
a11 = 0;
a12 = exp(-j*0.5*pi);
a21 = exp(-j*0.5*pi);
a22 = 0;
S = [a11, a12; a21, a22]
A = ((1+a11)*(1-a22)+a12*a21)/(2*a21);
B = ((1+a11)*(1+a22)-a12*a21)/(2*a21);
C = ((1-a11)*(1-a22)-a12*a21)/(2*a21);
D = ((1-a11)*(1+a22)+a12*a21)/(2*a21);
X = [A, B; C, D]
X_cleanup = X;
X_cleanup(abs(X_cleanup)<0.0001) = 0
Is there a way to automatically ask matlab to output matrix like what's in the X_cleanup instead of X?
Is there anyting under 'format'?
2 Commenti
Risposte (1)
Matt J
il 5 Ott 2021
Modificato: Matt J
il 5 Ott 2021
Is there a way to automatically ask matlab to output matrix like what's in the X_cleanup instead of X?
No, but note that if you expect your input data to be integer-valued, you can avoid the issue by generating them in integer form directly:
format shortG
a11 = 0;
a12 = -1i;
a21 = -1i;
a22 = 0;
S = [a11, a12; a21, a22]
A = ((1+a11)*(1-a22)+a12*a21)/(2*a21);
B = ((1+a11)*(1+a22)-a12*a21)/(2*a21);
C = ((1-a11)*(1-a22)-a12*a21)/(2*a21);
D = ((1-a11)*(1+a22)+a12*a21)/(2*a21);
X = [A, B; C, D]
5 Commenti
Matt J
il 5 Ott 2021
Well like I said, you can't make Matlab truncate results to zero on autopilot.
I think you would regret it even if it were implementable. In the situation you describe, Matlab would have no way of knowing if a computation was the final one or just an intermediate step in a future computation you are planning, so basically truncation would occur at every step in your computational pipeline and accumulate unpredictably.
Vedere anche
Categorie
Scopri di più su Structures 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!