matlab按自然顺序读取文件

柔光的暖阳◎ 2022-01-23 15:23 549阅读 0赞

matlab按名字读取的文件的时候，如果1,2,3,4,5...,15,那么会按照1,10,11,12,13,14,15,2,...的顺序来读取，有时候我们需要matlab按照自然顺序来读取，那么怎么办呢？

1、需要使用以下函数

function [cs,index] = sort_nat(c,mode)
    %sort_nat: Natural order sort of cell array of strings.
    % usage:  [S,INDEX] = sort_nat(C)
    %
    % where,
    %    C is a cell array (vector) of strings to be sorted.
    %    S is C, sorted in natural order.
    %    INDEX is the sort order such that S = C(INDEX);
    %
    % Natural order sorting sorts strings containing digits in a way such that
    % the numerical value of the digits is taken into account.  It is
    % especially useful for sorting file names containing index numbers with
    % different numbers of digits.  Often, people will use leading zeros to get
    % the right sort order, but with this function you don't have to do that.
    % For example, if C = {'file1.txt','file2.txt','file10.txt'}, a normal sort
    % will give you
    %
    %       {'file1.txt'  'file10.txt'  'file2.txt'}
    %
    % whereas, sort_nat will give you
    %
    %       {'file1.txt'  'file2.txt'  'file10.txt'}
    %
    % See also: sort
    
    % Version: 1.4, 22 January 2011
    % Author:  Douglas M. Schwarz
    % Email:   dmschwarz=ieee*org, dmschwarz=urgrad*rochester*edu
    % Real_email = regexprep(Email,{'=','*'},{'@','.'})
    
    
    % Set default value for mode if necessary.
    if nargin < 2
        mode = 'ascend';
    end
    
    % Make sure mode is either 'ascend' or 'descend'.
    modes = strcmpi(mode,{'ascend','descend'});
    is_descend = modes(2);
    if ~any(modes)
        error('sort_nat:sortDirection',...
            'sorting direction must be ''ascend'' or ''descend''.')
    end
    
    % Replace runs of digits with '0'.
    c2 = regexprep(c,'\d+','0');
    
    % Compute char version of c2 and locations of zeros.
    s1 = char(c2);
    z = s1 == '0';
    
    % Extract the runs of digits and their start and end indices.
    [digruns,first,last] = regexp(c,'\d+','match','start','end');
    
    % Create matrix of numerical values of runs of digits and a matrix of the
    % number of digits in each run.
    num_str = length(c);
    max_len = size(s1,2);
    num_val = NaN(num_str,max_len);
    num_dig = NaN(num_str,max_len);
    for i = 1:num_str
        num_val(i,z(i,:)) = sscanf(sprintf('%s ',digruns{i}{:}),'%f');
        num_dig(i,z(i,:)) = last{i} - first{i} + 1;
    end
    
    % Find columns that have at least one non-NaN.  Make sure activecols is a
    % 1-by-n vector even if n = 0.
    activecols = reshape(find(~all(isnan(num_val))),1,[]);
    n = length(activecols);
    
    % Compute which columns in the composite matrix get the numbers.
    numcols = activecols + (1:2:2*n);
    
    % Compute which columns in the composite matrix get the number of digits.
    ndigcols = numcols + 1;
    
    % Compute which columns in the composite matrix get chars.
    charcols = true(1,max_len + 2*n);
    charcols(numcols) = false;
    charcols(ndigcols) = false;
    
    % Create and fill composite matrix, comp.
    comp = zeros(num_str,max_len + 2*n);
    comp(:,charcols) = double(s1);
    comp(:,numcols) = num_val(:,activecols);
    comp(:,ndigcols) = num_dig(:,activecols);
    
    % Sort rows of composite matrix and use index to sort c in ascending or
    % descending order, depending on mode.
    [unused,index] = sortrows(comp);
    if is_descend
        index = index(end:-1:1);
    end
    index = reshape(index,size(c));
    cs = c(index);

2、

Dis = dir(Path); 
    
    DirCell=struct2cell(Dis);
    
    Dir = sort_nat(DirCell(1,:));