How to Extract Vector from Matrix and Get them in Print

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Mukund 2017-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/344323-how-to-extract-vector-from-matrix-and-get-them-in-print

评论： Image Analyst 2017-6-12

I have written code as below. a is input matrix. b (i) the vectors to be extracted.

clear all, clc;
a=[1 2; 3 4; 5 6; 7 8]
for i=1:4
    b=a(i,:)
end

I want to extract vectors as b1, b2, b3, b4. Also get the output in print as vectors extracted are b1, b2, b3, b4 (new line) from the matrix a. How can I code it appropriately?

When I try the command b(i)=a(i:1), I get error 'assignment dimension mismatch' When I try with extra command c(i)=b(i) with or without for loop, error displayed is 'index exceeds matrix dimensions'

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Answer 1

KSSV 2017-6-12

1
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https://ww2.mathworks.cn/matlabcentral/answers/344323-how-to-extract-vector-from-matrix-and-get-them-in-print#answer_270400

在 MATLAB Online 中打开

a=[1 2; 3 4; 5 6; 7 8] ;
% write matrix line by line
fid = fopen('text.txt','w') ;
for i=1:4
    b=a(i,:) ;
    fprintf(fid,[repmat(' %f ', 1, length(b)) '\n'],b') ;
end
fclose(fid) ;
% Write whole matrix at once
dlmwrite('text.txt',a) ;

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Mukund 2017-6-12

Hello KSSV, Thanks for your prompt response. I simply copied and pasted the code. The following error (image file attached) arouse regarding fprintf on Matlab 2015b. Can you please explore it bit more.