How to display a string and matrix in MATLAB?

2 459 vues (au cours des 30 derniers jours)
Amit Kumar
Amit Kumar le 18 Fév 2014
Hi all,
This question can look very basic to some experts of this forum, however the question bugs me as I am not an expert.
Say I initialize A= 3x3 unit matrix.
I want to display:
The result is: followed by matrix A.
I tried fprintf, but I guess it doesn't support matrix and I got errors.
disp() doesn't support displaying text+matrix.
Any idea how to do this?

Réponse acceptée

Jos (10584)
Jos (10584) le 18 Fév 2014
Modifié(e) : MathWorks Support Team le 27 Nov 2018
To display some text and a matrix, you can use two disp statements. This makes the code easy to understand and maintain.
For example, this code:
A = magic(3)
disp('The result is:')
disp(A)
Displays:
The result is:
8 1 6
3 5 7
4 9 2
If a one line solution is needed, you can use the num2str function to convert the matrix to a character array. This displays the contents of the array as a row vector though, changing the original shape of the matrix. To maintain the original shape of the matrix, use the first approach.
For example, this code:
A = magic(3)
disp(['The result is: [' num2str(A(:).') ']']) ;
Displays:
The result is: [8 3 4 1 5 9 6 7 2]
  6 commentaires
Jos (10584)
Jos (10584) le 18 Fév 2014
I really fail to see why it should be a single command …
A = magic(3)
% To put it on a single line (using a single command)
disp(['The result is: [' num2str(A(:).') ']']) ;
% and if you insist on using fprintf, try this:
fprintf('\nThe result is: [') ;
fprintf(' %d ', A) ;
fprintf(']\n') ;
Amit Kumar
Amit Kumar le 20 Fév 2014
Thanks!!

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Plus de réponses (2)

KAREN MEZA FLORES
KAREN MEZA FLORES le 21 Oct 2021
bro how do you even code - thanks

JIAN CUI
JIAN CUI le 26 Oct 2016
Same question, sometimes I wish to print sentence like 'The sum of matrix 1...n is N', which involves a matrix [1 .. n] and variable N, as well as strings. So how am I suppose to print this one out? Thank you!

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