# How to display a string and matrix in MATLAB?

3.245 views (last 30 days)
Amit Kumar on 18 Feb 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?

Jos (10584) on 18 Feb 2014
Edited: MathWorks Support Team on 28 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]

jandas on 18 Feb 2014
It can be done even using fprintf but you need to know the matrix dimension and this approach is rather messy:
fprintf('The result is:\n%6.2f %6.2f %6.2f\n%6.2f %6.2f %6.2f\n%6.2f %6.2f %6.2f\n', A')
Jos (10584) on 18 Feb 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 on 20 Feb 2014
Thanks!!

JIAN CUI on 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!

### Community Treasure Hunt

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

Start Hunting!

Translated by