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

for 1:5
fprintf('*') % am stuck right there

Answer 1

[Daniel Shub]

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{:})

[Kevin Junior]

I am trying to print a diamond with an empty space in the middle using fprintf statements

[Daniel Shub]

See my edit for diamonds.

[Usama Tanveer]

What if we tried to plot this shape

[Rik]

@Usama Tanveer The answer to this question can be found in the documentation of the plot function, which is probably the first place you should have looked. Did you?

Answer 2

[Simon]

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]

like printing shapes using asterix, for instance a rectangle, a square, a diamond i know I will definitely have to use nested loops

[Walter Roberson]

Filled or outline only?

Some of the shapes will not require nested for loops.

Answer 3

[Kambiz Hosseinpanahi]

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);