largr txt file to matrix extraction in matlab

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Kamal Bera 2015-4-15

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https://ww2.mathworks.cn/matlabcentral/answers/203737-largr-txt-file-to-matrix-extraction-in-matlab

评论： Kamal Bera 2015-5-6

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Hi Mr. Stephen Cobeldick, I am trying to apply your code (see below )to get a matrix of size 1710x1710 from a txt file (attached) as I did earlier to get 6x6 and 18x18 matrices from txt files. Unfortunately it is not working and shows error as

   Subscripted assignment dimension mismatch.
      Error in KSUBmatrix (line 9)
          out(k,:) = val{k}(:,2);

Kindly help me so that I can apply the code for any matrix dimension I wish to extract.It is urgently required.

str = fileread('STIFFNESS MATRIX .txt');        % txt file name STIFFNESS MATRIX extracted from ANSYS
[tok,idx] = regexp(str,'ROW\s+(\d+)\s+NODE\s+(\d+)\s+[^\n=]+=\s+(\w+)','tokens','end');
tok = vertcat(tok{:});
idx = [1+idx,numel(str)];
fun = @(b,e)reshape(sscanf(str(b:e),'%f'),2,[]).';
val = arrayfun(fun,idx(1:end-1),idx(2:end),'UniformOutput',false);
out = zeros(numel(val));
for k = 1:numel(val)
    out(k,:) = val{k}(:,2);
end
K=out;               % required structural stiffness matrix

The file attached is in zip form as it is of large size. If you required the file corresponding to 6x6 or 18x18 matrix cases(for which the given code works nicely), I will attach those separately.

I am egerly waiting for your quick response.

thank you.