speed up a for loop
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Hi i have a double foor loop like this where N3=1376 and N1=498.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/588141/image.jpeg)
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
2021-4-18
编辑:Walter Roberson
2021-4-18
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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