Create cell array of column indices of a specific string

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Davindra Usov 2022-6-21

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https://ww2.mathworks.cn/matlabcentral/answers/1745265-create-cell-array-of-column-indices-of-a-specific-string

评论： Voss 2022-6-22

Hi,

I have a 5x1 cell array ,g, where each cell is 40x50. I want to find the column indices of the string 'Latitude' in each of the cells in the cell array. I know there is 7 occurences of this string in each of the cells but I want the code to tell me that. My desired output is a new cell array where each cell contains the column indices of this string (so it will end up being a 5x1 cell array where each cell contains the 7 column indices). I tried this:

ind=find(~cellfun('Latitudes', g));

but it won't work. Any suggestions would be much appreciated

Thank you

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采纳的回答

Voss 2022-6-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1745265-create-cell-array-of-column-indices-of-a-specific-string#answer_990480

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% make cell array g
g = repmat({repmat({''},40,50)},5,1);
% put 7 random 'Latitude's in each cell
for ii = 1:5
    g{ii}(randi(2000,7,1)) = {'Latitude'};
end
% get the column index of each instance of 'Latitude'
cidx = cellfun(@get_latitude_columns,g,'UniformOutput',false)
cidx = 5×1 cell array
    {7×1 double}
    {7×1 double}
    {7×1 double}
    {7×1 double}
    {7×1 double}
% put them together in a matrix, if you prefer
% (5x7 or 7x5, whatever makes sense to you)
cidx = [cidx{:}].'
cidx = 5×7
     2     3    19    20    30    48    50
     8     8    10    11    25    36    46
    10    28    29    29    31    32    42
    14    16    17    22    34    43    45
     2    19    21    25    36    39    50
function idx = get_latitude_columns(s)
[~,idx] = find(strcmp(s,'Latitude'));
end