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fprintf cell array of two classes

조회 수: 16(최근 30일)
Lawrence Wang
Lawrence Wang 2020년 3월 17일
댓글: Lawrence Wang 2020년 3월 17일
Hi all,
I need to use fprintf to print out a char array (strictly 3 columns) and a double array side-by-side so they align. For instance:
charArr = ['USA' ; 'CAN' ; 'FRA']
doubArr = [1 2 3 4; 3 4 5 6; 6 7 8 9]
I want it to look something like:
USA 1 2 3 4
CAN 3 4 5 6
FRA 6 7 8 9
I tried to use cell arrays like below:
table = {charArr, doubArr};
fprintf( '%c, %d', table{:})
But I always get something funky and never what I want. Any help would be appreciated.

채택된 답변

Sriram Tadavarty
Sriram Tadavarty 2020년 3월 17일
편집: Sriram Tadavarty 2020년 3월 17일
Hi,
Use this if the number of rows of both the arrays are same
n = size(doubArr,1);
arrayfun(@(i) fprintf( '%s %s \n', charArr(i,:),num2str(doubArr(i,:))),1:n)
% You can even try this
comB = [charArr + " " + num2str(doubArr)];
fprintf('%s\n', comB)
Hope this helps.
Regards,
Sriram
  댓글 수: 2
Sriram Tadavarty
Sriram Tadavarty 2020년 3월 17일
Sure Lawrence.
It need to print the combination of numbers and characters. Since, the number of rows in both are same, the general apporach is to concatenate both the variables charArr and doubArr, like [charArr doubArr] but this converts the numeric values to the respective ASCII values. So inorder to make it combined through characters, i converted the numeric value to string value through num2str(doubArr), and then in the output you need additional space between the two arrays and each array needs to print a new line. So, comes the usage of " " in the comB variable and \n operator in fprintf respectively.
Hope this helps.

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추가 답변(2개)

Stephen
Stephen 2020년 3월 17일
편집: Stephen 2020년 3월 17일
No need for complex strings, ugly loops, or slow arrayfun, you just need one simple fprintf call::
>> A = ['USA' ; 'CAN' ; 'FRA'];
>> B = [1 2 3 4; 3 4 5 6; 6 7 8 9];
>> C = [cellstr(A),num2cell(B)].'; % transpose to get correct order
>> fprintf('%s %d %d %d %d\n', C{:})
USA 1 2 3 4
CAN 3 4 5 6
FRA 6 7 8 9
If you want to learn how to use MATLAB efficiently, you might as well start now.
  댓글 수: 3
Lawrence Wang
Lawrence Wang 2020년 3월 17일
Oh man I can't believe I forgot that. I'll definitely brush up on the docs. Thanks so much for your help.

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Bhaskar R
Bhaskar R 2020년 3월 17일
편집: Bhaskar R 2020년 3월 17일
require = string(cell2mat(strcat(charArr,{' '}, num2str(doubArr))));

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