how to add ; in real time matrix in matlab?

Question

Mudasir Ahmed 2015-12-30

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评论： Mudasir Ahmed 2016-1-1

hi

i have a matrix of 1000 by 3. which i have to copy from some where and paste in the matlab. But as the matrix is classified as 100 by 3, so i have to add ; after every 3rd element. which is very much time consuming for considering that size of array. is there any method in matlab which print ; after every 3rd element. in the end i copy all array and past in my code. kindly help me :)

with best regards mudasir ahmed

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Answer 1

Walter Roberson 2015-12-30

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编辑：Walter Roberson 2015-12-30

在 MATLAB Online 中打开

In MATLAB when you are inside [], then end of line is treated as a semi-colon (unless the line ended with ... )

A = [1 2 3
     4 5 6
     7 8 9];

This is the same as

A = [1 2 3; ...
     4 5 6; ...
     7 8 9];

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Answer 2

Guillaume 2015-12-30

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编辑：Guillaume 2015-12-30

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Assuming you meant that the original matrix is 100x30 (not 100x3 which makes no sense), you could simply paste it as is and reshape afterwards:

m = reshape(m', 3, 1000)'

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Mudasir Ahmed 2016-1-1

在 MATLAB Online 中打开

farhan.txt

Dear Sir

i have written the following code for text file attached in this email. the first three lines execute correctly and gives data cell dimensions 13 by 3. as i take short matrix for learning and in the text file matrix size is 13 by 3. but last line generates error which i pasted in last.

fid = fopen('C:\Users\Mudasir Ahmed\Desktop\farhan.txt', 'rt')
datacell = textscan(fid, '%s %s %s', 'CollectOutput', 1)
fclose(fid)
M = cellfun(@sym, horzcat(datacell{:}))

in above code. by executing last line, matlab gives following error:

Error using sym>convertExpression (line 1362) Conversion to 'sym' returned the MuPAD error: Error: Invalid input. 'expression' is expected. [line 1, col 52]

Error in sym>convertChar (line 1273)
    s = convertExpression(x);
Error in sym>convertCharWithOption (line 1256)
        s = convertChar(x);
Error in sym>tomupad (line 984)
        S = convertCharWithOption(x,a);
Error in sym (line 139)
            S.s = tomupad(x,'');
with best regards
mudasir ahmed

Walter Roberson 2016-1-1

在 MATLAB Online 中打开

fid = fopen('C:\Users\Mudasir Ahmed\Desktop\farhan.txt', 'rt')
datacell = textscan(fid, '%s %s %s', 'CollectOutput', 1, 'Delimiter', ',');
fclose(fid);
data = datacell{1};
M = sym(zeros(size(data));
for K = 1 : numel(data);M(K) = sym(data{K}); end