Is FORMAT DEBUG still any useful?
7 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Bruno Luong
am 13 Jan. 2021
Bearbeitet: Walter Roberson
am 25 Jun. 2024
Can someone has an explanation for this (R2020B)
clear
clc
x=1;
y=x;
x=x+1;
format debug
y
x
that produces
y =
Structure address = 23ebc936f80
m = 1
n = 1
pr = 23edbdd6660
1
x =
Structure address = 23ebc936f80
m = 1
n = 1
pr = 23edbdd6660
2
So x and y have the same structure address and data address, yet data are different (1 for y and 2 for x).
Finish the time where FORMAT DEBUG returns useful information for us.
2 Kommentare
James Quinlan
am 30 Jun. 2021
Hi Bruno, were you able to submit a bug report? I am running into similar issues. I am performing memory tests and tests are unreliable in light of your comment. I reproduce results from both you and James Tursa below giving same addresses for x and y even after x has been modified. I am running Version: 9.10.0.1602886 (R2021a).
My test is slightly different in the sense, I assign x a value, then pass it to a function and make assignment, y = x. From my understanding, if you pass x to a function and don't update it while there, it effectively is pass by reference.
Akzeptierte Antwort
James Tursa
am 13 Jan. 2021
Strange behavior and probably deserves a bug report. E.g.,
R2019a:
>> x = 1;
>> y = x;
>> x = x + 1;
>> format debug
>> y
y =
Structure address = fa4a7890
m = 1
n = 1
pr = 119f97b20
1
>> x
x =
Structure address = fa4a76d0
m = 1
n = 1
pr = 17c869780
2
R2019b:
>> x = 1;
>> y = x;
>> x = x + 1;
>> format debug
>> y
y =
Structure address = f7ef7ac0
m = 1
n = 1
pr = 145dbaec0
1
>> x
x =
Structure address = f7ef7ac0
m = 1
n = 1
pr = 145dbaec0
2
R2020a:
>> x = 1;
>> y = x;
>> x = x + 1;
>> format debug
>> y
y =
Structure address = 192d47e2d40
m = 1
n = 1
pr = 192d3b7a5c0
1
>> x
x =
Structure address = 192d47e2d40
m = 1
n = 1
pr = 192d3b7a5c0
2
So the problem goes back as far as R2019b.
5 Kommentare
Huang Huang
am 25 Jun. 2024
Bearbeitet: Walter Roberson
am 25 Jun. 2024
maybe need use mex.see the following link
Weitere Antworten (1)
Siehe auch
Kategorien
Mehr zu NaNs 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!