Why is this happening in this code?

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alpedhuez
alpedhuez 2022-3-12
评论： alpedhuez 2022-3-12
I run the code from https://www.mathworks.com/matlabcentral/answers/1646135-downloading-files-from-a-website-with-conditions-on-names-of-files?s_tid=srchtitle with the modification from a previous question:
baseurl = "https://www.somecompany.com/xml/";
datelimits = datetime({'20080401', '20080501'}, 'InputFormat', 'yyyyMMdd','Format','yyyyMMdd');
subfile_limit = 5; %no more than _5 -- adjust as appropriate
subfile_modifier = ["", "_" + (1:subfile_limit)] + ".xml";
for Day = datelimits(1):datelimits(2)
daystr = string(Day);
for Sub = subfile_modifier
filename = "A_" + daystr + Sub;
url = baseurl + filename;
try
outfilename = websave(filename,url);
fprintf('fetched %s\n', filename);
catch
break; %skip remaining subfiles for this date upon first failure
end
end
end
Then I got the following value for "subfile_modifier"
https://imgur.com/a/mRciGL2
But the following for "Sub"
https://imgur.com/a/qvgWwro
I do not understand why "_' + (1:subflie_limit) part is missing. Please advise.

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采纳的回答

Cris LaPierre
Cris LaPierre 2022-3-12
Ran in:
The ".xml" corresponds to the "" in your submifle_modifier.
subfile_limit = 5;
subfile_modifier = ["","_" + (1:subfile_limit)] + ".xml"
subfile_modifier = 1×6 string array
".xml" "_1.xml" "_2.xml" "_3.xml" "_4.xml" "_5.xml"
If you do not want to use that extension, then remove the "".
subfile_modifier = ["_" + (1:subfile_limit)] + ".xml"
subfile_modifier = 1×5 string array
"_1.xml" "_2.xml" "_3.xml" "_4.xml" "_5.xml"

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