Matlab:如何通过指定 header 名称读取和提取矩阵？

Question

是否可以从文本文件中读取指定标题下的矩阵？我有一个像这样的文本文件:

Header A (2x3):
3 6 7
5 8 8
Header B (4x4):
23 65 2 6 
4 6 7 8
33 7 8 9

所以我想要完成的是将标题名称作为参数并获取其下的矩阵。可以用Matlab实现吗？

提前致谢!!

Answer 1

此外，尝试使用此代码:

infilename = '1.txt'; % name of your file
m = memmapfile(infilename);  % load file to memory (and after close it)
instrings  = strsplit(char(m.Data.'),'\n','CollapseDelimiters',true).';

checkstr = 'Header B';
% find all string (their indices) starting with checkstr 
ind = find(strncmpi(instrings,checkstr,length(checkstr)));


data = [];
if isempty(ind)
   fprintf('\n No strings with %s',checkstr)
else
   % first string with string checkstr

    n = ind(1)+1;
    N = length(instrings);
    while n<=N % find all numerical data after string with `checkstr`
        convert = str2num(instrings{n});
        if isempty(convert), break, end % find non-numerical data

        data(end+1,1:length(convert)) = convert; % it because you can have various number of columns
        n = n+1;
    end
end

data % display load data

输出

23    65     2     6     7
 4     6     7     8     0
33     7     8     9     0

对于文件1.txt:

Header A (2x3):
3 6 7
5 8 8
Header B (4x4):
23 65 2 6 7
4 6 7 8
33 7 8 9