fprintf cell array of two classes

5 vues (au cours des 30 derniers jours)
Lawrence Wang
Lawrence Wang le 17 Mar 2020
Commenté : Lawrence Wang le 17 Mar 2020
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.

Réponse acceptée

Sriram Tadavarty
Sriram Tadavarty le 17 Mar 2020
Modifié(e) : Sriram Tadavarty le 17 Mar 2020
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
  2 commentaires
Lawrence Wang
Lawrence Wang le 17 Mar 2020
Thanks! Your second expression with the comB part is perfect. If you don't mind could you explain how exactly you got there, I'm trying to understand.
Sriram Tadavarty
Sriram Tadavarty le 17 Mar 2020
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.

Connectez-vous pour commenter.

Plus de réponses (2)

Stephen23
Stephen23 le 17 Mar 2020
Modifié(e) : Stephen23 le 17 Mar 2020
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.
  3 commentaires
Stephen23
Stephen23 le 17 Mar 2020
Modifié(e) : Stephen23 le 17 Mar 2020
"Is there any way to rectify this? "
Of course! Just select a suitable fieldwidth, e.g.:
>> A = ['USA' ; 'CAN' ; 'FRA'];
>> B = [1,0,12,3;9,12,11,21;2,5,9,2];
>> C = [cellstr(A),num2cell(B)].';
>> fprintf('%5s %3d %3d %3d %3d\n', C{:})
USA 1 0 12 3
CAN 9 12 11 21
FRA 2 5 9 2
The fprintf documentation explains the fprintf options.
Lawrence Wang
Lawrence Wang le 17 Mar 2020
Oh man I can't believe I forgot that. I'll definitely brush up on the docs. Thanks so much for your help.

Connectez-vous pour commenter.


Bhaskar R
Bhaskar R le 17 Mar 2020
Modifié(e) : Bhaskar R le 17 Mar 2020
require = string(cell2mat(strcat(charArr,{' '}, num2str(doubArr))));

Catégories

En savoir plus sur Characters and Strings dans Help Center et File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by