Trying to replace for loop with faster code
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Lukas Netzer
el 23 de Ag. de 2021
Comentada: Lukas Netzer
el 23 de Ag. de 2021
I have the following code in a rather large script, which unfortunately is VERY slow:
for x = 1:size(table1)
for y = 1:size(Loc_all)
if ismember(table1.Loc(x),Loc_all(y)) == 1
table1.dur(x) = t_avg(y);
break
end
end
end
It definitely works, but again the duration time is not "workable".
So I tried the following:
f = ismember(table1.Loc,Loc_all) == 1;
[IndexM, IndexN]=find(f);
table1.dur(IndexM) = t_avg(IndexN);
It works for IndexM which defines the location in table1.Loc - but it wont work for IndexN - all I get here is 1's. What am I missing?
As you can see t_avg and Loc_all have the same size, as do table1.Loc and table1.dur - I'm expecting IndexN to give the Location in Loc_all where a match happens.
Loc_all only has unique values. table1.Loc is a large table of values which may or may not be in Loc_all.
Any hints are very much appreciated!
Thank you!
1 comentario
DGM
el 23 de Ag. de 2021
It would help to provide some succinct example data to demonstrate what exactly you're dealing with.
Respuesta aceptada
Voss
el 23 de Ag. de 2021
The second output argument of the find function is column indices. In order to get indices in Loc_all where a match happens, you can use the second output argument of ismember:
[f, IndexN] = ismember(table1.Loc,Loc_all); % f is the same as your f; IndexN is what you expect, except it has zeros where no match occurred (i.e., where f is false)
IndexN = IndexN(f); % keep only the IndexN where a match occurred
IndexM = find(f); % convert logical index f to integer index IndexM; IndexM is the same as your IndexM
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