Place filenames with common pattern in a cell array

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Davindra Usov
Davindra Usov 2023-4-24
评论： Davindra Usov 2023-4-25
Hi there,
If I have a cell array containing filenames in the following format 'breakpoint_b40_f15.txt', 'breakpoint_b50_f15.txt', 'breakpoint_b40_f20.txt', 'breakpoint_b50_f20.txt', how do I create a new cell array where each row contains the files with the same number after 'f'? for example. 'breakpoint_b40_f15.txt' and 'breakpoint_b50_f15.txt' should be in the same row, and 'breakpoint_b40_f20.txt' and 'breakpoint_b50_f20.txt' should be in the same row but in a different row to the f15 row.
Many thanks
  2 个评论
Stephen23
Stephen23 2023-4-24
移动：Stephen23 2023-4-24
Ran in:
C = {'breakpoint_b40_f15.txt', 'breakpoint_b50_f15.txt', 'breakpoint_b40_f20.txt', 'breakpoint_b50_f20.txt'};
D = reshape(C,2,2).'
D = 2×2 cell array
{'breakpoint_b40_f15.txt'} {'breakpoint_b50_f15.txt'} {'breakpoint_b40_f20.txt'} {'breakpoint_b50_f20.txt'}
Davindra Usov
Davindra Usov 2023-4-24
移动：Stephen23 2023-4-24
Thanks a bunch Stephen. This works but how can I change the number of rows of D to be the number of unique f values, which in this case is 2 (15 and 20)?

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采纳的回答

dpb
dpb 2023-4-24
移动：Image Analyst 2023-4-24
C = {'breakpoint_b40_f15.txt', 'breakpoint_b50_f15.txt', 'breakpoint_b40_f20.txt', 'breakpoint_b50_f20.txt', 'breakpoint_b40_f25.txt','breakpoint_b50_f25.txt'};
N=numel(unique(extractBetween(extractAfter(C,'breakpoint_'),'_','.txt')));
reshape(C,[],N).'
Relies upon the sequence being already sorted in pairs; otherwise need to locate the elements position if not already sorted -- or sort first by the second substring of interest. Another case where putting metadata into the filenames makes things harder than if were real data in a database file....seems to be a spate of those recently.

更多回答（2 个）

dpb
dpb 2023-4-24
移动：Image Analyst 2023-4-24
Ran in:
C = {'breakpoint_b40_f15.txt', 'breakpoint_b50_f15.txt', 'breakpoint_b40_f20.txt', 'breakpoint_b50_f20.txt'}.';
N=(extractBetween(extractAfter(C,'breakpoint_'),'_','.txt'))
N = 4×1 cell array
{'f15'} {'f15'} {'f20'} {'f20'}
uN=unique(N)
uN = 2×1 cell array
{'f15'} {'f20'}
Add/use N as a grouping variable or sort by indexing array...
Kevin Holly
Kevin Holly 2023-4-24
移动：Image Analyst 2023-4-24
Ran in:
C = {'breakpoint_b40_f15.txt', 'breakpoint_b50_f15.txt', 'breakpoint_b40_f20.txt', 'breakpoint_b50_f20.txt', 'breakpoint_b40_f25.txt','breakpoint_b50_f25.txt'};
D = strfind(C,'breakpoint_b40_f');
f = length([D{:}])
f = 3
D = strfind(C,'_f15');
b = length([D{:}])
b = 2
D = reshape(C,b,f).'
D = 3×2 cell array
{'breakpoint_b40_f15.txt'} {'breakpoint_b50_f15.txt'} {'breakpoint_b40_f20.txt'} {'breakpoint_b50_f20.txt'} {'breakpoint_b40_f25.txt'} {'breakpoint_b50_f25.txt'}

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