Max distance between 0s in matrix - double loop

Question

I have a matrix which only consists of 0s and 1s. I want to make a nested loop which checks the consecutive 0s in my matrix and prints out the number as the distance . I will use the distance later to compute distance beetween points of the matrix.

Here's my code and my test matrix B.

B = [ 1     1     1     0     0     0     1
 0     0     0     1     1     1     1];


for i=1:2    
  for j=1:7    
    if B(i,j)==0   
        jtemp=j;  
        distance=0;  
        while B(i,jtemp)==0  
            jtemp=jtemp+1;  
            distance=distance+1;  
        end
        fprintf('%0.0f,The distance is\n',distance)
    end
  end
end

When I run this code I get something like this :

3,The distance is
2,The distance is
1,The distance is
3,The distance is
2,The distance is
1,The distance is

So my question is why this code doesn't print the distance by calculating the consecutive 0s in a row of the matrix

The question is why it doesn't work properly , for example in the first row it doesn't come with the answer the distance is 3 — Alex Lemesios
Your fprintf command seems malformed. Try this instead: fprintf('The distance is %g\n',distance) — chappjc

marsei marsei · Accepted Answer · 2013-11-04T14:10:45

This behavior is due to the successive calls of j (from 1 to 7, whatever the value of jtemp is). You may insert a condition (if j<jtemp) that tells matlab not to process further (continue) until j matches jtemp again.

for i=1:2

    jtemp = 1;

    for j=1:7

        if j<jtemp
            continue
        end

Max distance between 0s in matrix - double loop

1 Answers