How to get this while cycle?

1 Ansicht (letzte 30 Tage)
Elia Paini
Elia Paini am 16 Aug. 2021
Kommentiert: Elia Paini am 16 Aug. 2021
Hi, I'm trying to get a while cycle which checks convergence every iteration.
Within the cycle, I'm solving a system which returns each iteration 3 types of solutions: a (vector), B, C (matrices).
Subscript "0" is related to the (l-1) iteraton, the other refers to the (l) iteration.
I wrote this code:
while (abs(a_0-a) > 1e-6) & (abs(B_0-B) > 1e-6) & (abs(C_0-C) > 1e-6)
....
end
It starts, but it do only one iteration, I don't know why.
It should iterate until ALL residues are lower than 1e-6.
Probably it's wrong, maybe due to parentheses or logical operators. I've already tried to change them, but in the other cases it doesn't work.
What should I do?
Thank you for your help!!

Akzeptierte Antwort

Fabio Freschi
Fabio Freschi am 16 Aug. 2021
if B and C are matrices, make them vectors using :
while any(abs(a_0-a) > 1e-6) || any(abs(B_0(:)-B(:)) > 1e-6) || any(abs(C_0(:)-C(:)) > 1e-6)

Weitere Antworten (1)

Walter Roberson
Walter Roberson am 16 Aug. 2021
while (abs(a_0-a) > 1e-6) || (abs(B_0-B) > 1e-6) || (abs(C_0-C) > 1e-6)
  5 Kommentare
Walter Roberson
Walter Roberson am 16 Aug. 2021
while any(abs(a_0-a) > 1e-6, 'all') || any(abs(B_0-B) > 1e-6, 'all') || any(abs(C_0-C) > 1e-6, 'all')
The implication is that at least one of your subtractions is giving back a matrix that is 2 or more dimensions.
Please check that a_0 and a, and B_0 and B, and C_0 and C, have the same orientation if they are vectors. For example,
(1:3).' - (1:3)
is not the vector [0 0 0]
Elia Paini
Elia Paini am 16 Aug. 2021
I checked, the couples have the same dimension and orientation.
a_0 and a are (4x1), B_0 and B are (4x2), C_0 and C are (4x3)

Melden Sie sich an, um zu kommentieren.

Kategorien

Mehr zu MATLAB Coder 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!

Translated by