# Does someone know how to print a square onto the command window using for loops????

41 views (last 30 days)
Kevin Junior on 17 Sep 2013
Edited: Walter Roberson on 26 Jun 2018
for 1:5
fprintf('*') % am stuck right there

Daniel Shub on 17 Sep 2013
Edited: Daniel Shub on 17 Sep 2013
I am not sure why you want to use a loop or fprintf. The simplest, but potentially not square enough solution for a filled square
N = 5;
x = repmat(char(42), N, N);
disp(x);
*****
*****
*****
*****
*****
For an unfilled square you can do
N = 5;
x = repmat(char(42), N, N);
x(2:end-1, 2:end-1) = char(32);
disp(x);
*****
* *
* *
* *
*****
On my system I get a squarer square with
x = repmat([char(42), char(32)], N, N)
* * * * *
* * * * *
* * * * *
* * * * *
* * * * *
Depending on how perfect you want, maybe you could use a thin space or a wide space.
For a filled diamond
a = [fliplr(tril(true(N))), tril(true(N)); triu(true(N)), fliplr(triu(true(N)))];
x = repmat(char(32), 2*N, 2*N);
x(a) = char(42);
disp(x)
**
****
******
********
**********
**********
********
******
****
**
For an empty diamond
a = [fliplr(triu(tril(true(N)))), triu(tril(true(N))); tril(triu(true(N))), fliplr(tril(triu(true(N))))];
x = repmat(char(32), 2*N, 2*N);
x(a) = char(42);
disp(x)
**
* *
* *
* *
* *
* *
* *
* *
* *
**
If you really need to use fprintf
y = mat2cell(x(:), ones(numel(x), 1), 1);
fprintf([repmat('%s', 1, 2*N), '\n'], y{:})
##### 2 CommentsShowHide 1 older comment
Daniel Shub on 17 Sep 2013
See my edit for diamonds.

Simon on 17 Sep 2013
Hi!
You should start reading here: http://www.mathworks.com/help/matlab/control-flow.html This explains how to use loops and their syntax.
What do you mean with "square"?
Kevin Junior on 17 Sep 2013
unfilled diamond using just fprintf statements

Kambiz Hosseinpanahi on 26 Jun 2018
Edited: Walter Roberson on 26 Jun 2018
clc
clear
n=10;
A=repmat(char(42),n,n);
A(1:end-1,2:end)=char(32);
for i=2:10
A(i,i)=char(42);
end
disp(A);