speed up a for loop
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Giacomo Abrardo
am 18 Apr. 2021
Kommentiert: Giacomo Abrardo
am 18 Apr. 2021
Hi i have a double foor loop like this where N3=1376 and N1=498.
I need to speed up the double loop because in one day of running i just have a 1376*68 matrix. The first solution i considered is to preallocate the matrix SM outside the double loop but i don't know if that will be enough. Do you have any suggestions? Thanks all
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Walter Roberson
am 18 Apr. 2021
Bearbeitet: Walter Roberson
am 18 Apr. 2021
Inside your inner for loop, you read three .nc files. For efficiency, you need to reduce the number of files you need. So reverse the order of your loops
for j = 1 : N3
FileNC=P{j}
ncdisp(FileNC);
latidudine = ncread(FileNC, 'lat');
longitudine = ncread(FileNC, 'lon');
umidata = ncread(FileNC, 'ssm');
do the two find and through to sm=sm*0.5
for k = 1 : N1
LAT = Latitudine_stazioni(k,1);
LONG = Lognitudine_stazioni(k,1);
[val1,idx1] = min(abs(Long-LONG));
and through to the end of your loop, to the assigment to SM(j,k)
end
end
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