MATLAB: While loop in while loop; Shortening

MATLABshorteningwhile loop

I want an overall while loop that is executed until a certain condition is true (let's say J=13).
The whole loop starts with J=5 and j=1 and inside the while loop j is raised +1 until j =J. Then the second while loop starts with J = J+1.
How can I shorten this code with one while loop ?
J=5;
j=1;
while (j<7) 
    if (j>J)
    break
    end
    z=63*pi*(J-j);
    j=j+1;
    disp(z)
end
J=J+1;
j=1;
while (j<7) 
    if (j>J)
    break
    end
    z=63*pi*(J-j);
    j=j+1;
    disp(z)
end
J=J+1;
j=1;
while (j<7) 
    if (j>J)
    break
    end
    z=63*pi*(J-j);
    j=j+1;
    disp(z)
end
..... (and so on until J=13)

Best Answer

You could try the following.
J=5;
while J<13
    if J>=7
        j=1:6;
    else
        j=1:J;
    end
    z=63*pi.*(J-j); %piecewise multiplication
    disp(z)
    J=J+1;
end
This satisfies the conditions of j less than or equal to J and j less than 7.
Note the .* operation (see link)
When j is not changing in size, i.e. after the first two iterations of the loop, you could in fact get a solution therein without any loops:
j=1:6;
J=[7:13]';
z=63*pi.*(J-j)
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