Parse cell array into separate cells, with no delimiter
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Hello! I am trying to parse the name of a file into separate variables to describe the file, but there are no delimiters in the file name. For example, if my file name is
fileName = {'11171401'}
I want to divide this into:
track = {'1117'}
cycle = {'14'}
segment = {'01'}
I've already chopped off the beginning of the file name using the split function, but I can't seem to figure out how to divide up the rest without a delimiter. Thank you in advance for any help!
6 个评论
James Tursa
2022-7-7
What are the rules for the name splitting? If it is always 4-2-2 character splits then you could just use indexing.
Gabrielle Trudeau
2022-7-7
编辑：Gabrielle Trudeau
2022-7-7
Gabrielle Trudeau
2022-7-7
per isakson
2022-7-7
In your solution, track, cycle and segment are all double, not cells containing character vectors as required. Try
fileName = {'11171401'};
track = {fileName{1}(1:4)}
cycle = {fileName{1}(5:6)}
segment = {fileName{1}(7:8)}
Gabrielle Trudeau
2022-7-8
fnm = {'11171401'; '22282512'; '33393623'};
tkn = regexp(fnm,'^(\d{4})(\d\d)(\d\d)$','tokens','once');
tkn = vertcat(tkn{:})
采纳的回答
fileName = {'11171401'; '22282512'; '33393623'};
[track,cycle,segment] = cellfun(@(x)parse_file_name(x),fileName,'UniformOutput',false)
function [t,c,s] = parse_file_name(fn)
t = fn(1:4);
c = fn([5 6]);
s = fn([7 8]);
end
2 个评论
Gabrielle Trudeau
2022-7-8
You're welcome!
The way you did it works only for a scalar cell array fileName. Here's testing it on a non-scalar cell array:
fileName = {'11171401'; '22282512'; '33393623'};
X = cell2mat(fileName)
% indexing goes down the first column first, giving incorrect results
track = str2num(X(1:4))
cycle = str2num(X(5:6))
segment = str2num(X(7:8))
Also, your way gives numeric results, but my answer gives cell arrays of character vectors, as specified in the question:
track = {'1117'}
cycle = {'14'}
segment = {'01'}
So since the two methods are really doing completely different things, it's not meaningful to try to compare their relative efficiency.
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