While loop in while loop; Shortening

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)

Answer 1

[Turlough Hughes]

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)

[M_Szer]

Thank you !!

Is it possible to create a table with J on the row , j on the column and z in the cross section ?

j\J 5 6 7 8 9 ...

1 z z z z z

2 z z z z z

3 z z z z z

.....

[Turlough Hughes]

You just need to rearrange your order when initially specifying j and J. i.e. j is now a column vector while J is now a row vector.

j=[1:6]';
J=7:13;
z=63*pi.*(J-j)