how to ignore an index error?
2 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Laura Alvarez
am 14 Dez. 2019
Bearbeitet: Laura Alvarez
am 14 Dez. 2019
I have this code and I want to ignore the error when the index exceeds array bounds or when they are 0.
for j=1:N
for i=1:N
u(i,j)=(c(i,j)+u(i-1,j)+u(i+1,j)+u(i,j-1)+u(i,j+1))/4
end
end
I just want to ignore u(0, j), u(N + 1, j), u(i, 0) and u(i, N + 1) or assign them the value 0.
Thank you so much!
1 Kommentar
dpb
am 14 Dez. 2019
Bearbeitet: dpb
am 14 Dez. 2019
There is no 0-index array element so assigning it any value, zero or not, is out of the question.
You could put the expression in a try...catch...end construct but reconstructing the expression to maintain arrays in bounds would be the better solution.
filter2() possibly would be of use here altho the expression appears somewhat unusual with five terms dividing by four...
Akzeptierte Antwort
dpb
am 14 Dez. 2019
H=[0 1 0;1 0 1; 0 1 0]; % filter coefficients
u(2:end-1,2:end-1)=(c(2:end-1,2:end-1)+filter2(H,u,'valid'))/4; % apply filtered u to c
0 Kommentare
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Matrices and Arrays finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!