Skipping iteration on child throwing a warning
2 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Aboltabol
am 28 Sep. 2023
Kommentiert: Bruno Luong
am 28 Sep. 2023
I have a script X that has:
for x = 1:5000
output{x} = Script_Y(input(:,:,:,x));
end
Script_Y has a particular loop (among other code):
for alpha = 1:(size(input, 3)-1)
output_preprocessed = Script_Z(input(:,:,alpha), input(:,:,alpha+1));
end
% Later, some more operations are committed on output_preprocessed to give
% the function output.
Script_Z has a loop (among other code):
% Some operations are committed on function inputs to get input_postprocessed_1 and input_postprocessed_2
for k = 1:200
x = input_postprocessed_1/input_postprocessed_2
% More steps to make x precise %
end
% Later, some more operations are committed on x to give
% the function output.
It might occur that for some k, input_postprocessed_1 is singular or near-singular and as soon as Matlab throws this warning, I want to skip the particular iteration in the master loop at my script X! For that x, output{x} shall return NULL or nothing - either sufices for me.
How to go about?
2 Kommentare
Image Analyst
am 28 Sep. 2023
What exactly is the warning? Please paste back here all the orange or red text that you see when it produces the warning.
Bruno Luong
am 28 Sep. 2023
Actually it input_postprocessed_2 at the right division and the warning is likely the infamous
Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = XXXXXX.
Akzeptierte Antwort
Bruno Luong
am 28 Sep. 2023
Bearbeitet: Bruno Luong
am 28 Sep. 2023
Modification of script_Z
for k = 1:200
lastwarn('',''); % clean the warning state
x = input_postprocessed_1/input_postprocessed_2;
[~,warnid] = lastwarn;
if strcmp(warnid, 'MATLAB:singularMatrix');
x = []; % I assume this is output_preprocessed returned to script Y
break
end
% More steps to make x precise %
end
script_Y
for alpha = 1:(size(input, 3)-1)
output_preprocessed = Script_Z(input(:,:,alpha), input(:,:,alpha+1));
if isempty(output_preprocessed)
break
end
end
script_X
for x = 1:5000
output{x} = Script_Y(input(:,:,:,x));
% output{x} is empty if the division fails ( input_postprocessed_2is
% singular)
end
0 Kommentare
Weitere Antworten (1)
Image Analyst
am 28 Sep. 2023
You can use try catch:
for k = 1 : 200
try
% In the try block put the code that might throw an error.
catch ME
% If you get here an error occurred.
continue; % To continue with next iteration, or use "break" to exit the loop.
end
end
1 Kommentar
Bruno Luong
am 28 Sep. 2023
Bearbeitet: Bruno Luong
am 28 Sep. 2023
warning cannot be branched by try/catch, only error can.
Siehe auch
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!