MATLAB: For loop within for loop

for loop

Hey,

I want to make two for loops. the first for loop is when the values are j = [1:4,5:8,9:2,13:6,7:20,21:24]

because I am using this for a subplot, so when j = 1 or j=5 or j=9 or j=13 or j=17 or j=21 then i=1.

When j=2, j=6 ,j=10 , j=14 , j=18 or j=22 then i=2.

When j=3, j=7, j=11, j=15, j=19 or j=23 then i=3.

When j=4, j=8, j=12, j=16, j=20, j=24 then i=4.

I don't know what you want to do inside those for loops so I can't give you full code but the loops you'll want are:

for i=1:4;
    for j=i:4:24;
        
    end
end

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)

for i=1:3
  figure
  for j=1:6
    %calculation
      subplot(2,3,j);
      %plot commands
    end
  end