Importing a CSV file as a nested cell array - is it possible

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AndyT
AndyT 2015-7-12
编辑： Stephen23 2015-7-13
I'm struggling to find any online help documentation on this . Is it possible to import a csv file derived from MSExcel into Matlab directly as a nested cell array
For example if the CSV file has several rows, each with a set of values such as
23,34,1
23,44,55,72,65
4,86,98,7,12,34,9
I want to import this as a nested cell array such that the main array is of size 3 x 1 and each cell contains the data in the csv file row as nested sub arrays. So cell (1,1)of the main array has a (1x3) subarray from the first row of the CSV. Cell 2 has a (1x5) subarray from the second row and Cell 3 has a (1x7) subarray from the third row of the CSV file.
When I use the standard import data function and select 'cell array' from the options Matlab just creates one large 3x 7 array in this example and puts NaNs in the blanks.
Is it actually possible to do this or do I need to create the nested array as a separate step after importing the CSV file and how do I do that .
Many thanks

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采纳的回答

Stephen23
Stephen23 2015-7-13
编辑：Stephen23 2015-7-13
Here is a simple and neat solution using fileread and regexp:
out = regexp(fileread('temp.txt'),'[\n\r]+','split');
out = cellfun(@(s)sscanf(s,'%f,').', out, 'UniformOutput',false);
which we can check in the command window:
>> out{1}
ans =
23 34 1
>> out{2}
ans =
23 44 55 72 65
>> out{3}
ans =
4 86 98 7 12 34 9
The code was tested using this file:
  2 个评论
AndyT
AndyT 2015-7-13
Thank You Stephen , this does it and using function combinations I would never have found on my own. Much appreciated
Stephen23
Stephen23 2015-7-13
编辑：Stephen23 2015-7-13
My pleasure! Note that it will only work for exactly that file format that you specified in your question: as soon as space characters or letters appear in there it will probably fail :)

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更多回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2015-7-12
编辑：Walter Roberson 2015-7-13
Import your data, then get ride of nan
  1 个评论
AndyT
AndyT 2015-7-13
Thank you Azzi, not sure I understand this . If I import and get rid of NaN ( which I do with cellfun) it doesn't create the nested cells with the data in that I require.

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Walter Roberson
Walter Roberson 2015-7-12
fid = fopen('YourFile.csv', 'rt');
counter = 0;
while true
inline = fgetl(fid);
if ~ischar(inline); break; end %end of file
counter = counter + 1;
datacell{counter} = textscan(inline, '%f', 'Delimiter', ',');
end
  1 个评论
AndyT
AndyT 2015-7-13
Many thanks Walter, this works but seems to create 2 levels of the datacell array . The first is a 1x 1 cell and then that contains the data as another subcell e.g. datacell{1,1} is a 1x 7 cell . So the actual data is held in datacell{1,1}{1,1}.

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