How to use if condition inside for loop without breaking the loop?

Hi everyone,

I have review many post related to use of if loop inside loop in such a way that if did not influnec the runing loop. However, i am facing probelm while implementing the same approach.

Here os waht i attempt so far:

for kk=2:3
    s1=t_d(t_d(:,1)>= CE_L(kk) & t_d(:,1)<= CE_U(kk),:);
    s2=v_d(v_d(:,1)>= CE_L(kk) & v_d(:,1)<= CE_U(kk),:);
    if length(s1) == length(s2)
        continue
    S=[s1 s2];
    t=S(:, 1);
    t=(t-t(1));  %time (days) (initial offset removed)
    ser1=S(:, 2)-mean(S(:,2)); % series 1 minus its mean
    ser2=S(:, 4)-mean(S(:,4)); % series 2 minus its mean
    end
end

However, my for loop stop working when if condition not satisified. Whereas, I want my for loop move to next iteration, but i didn't. May somene suggest how can i fix this.

Thank you!

[KSSV]

Why do you think for loop stopes when if condition is not met?

[Torsten]

Maybe you mean

for kk=2:3
    s1=t_d(t_d(:,1)>= CE_L(kk) & t_d(:,1)<= CE_U(kk),:);
    s2=v_d(v_d(:,1)>= CE_L(kk) & v_d(:,1)<= CE_U(kk),:);
    if length(s1) == length(s2)
        continue
    end
    S=[s1 s2];
    t=S(:, 1);
    t=(t-t(1));  %time (days) (initial offset removed)
    ser1=S(:, 2)-mean(S(:,2)); % series 1 minus its mean
    ser2=S(:, 4)-mean(S(:,4)); % series 2 minus its mean
end

[Andi]

@Torsten earlier attepmed the way you suggets but still i did not get any output and no error as well.

[Andi]

@KSSV becsue i know for few interation if condition satisify and for few not. Whereas, i did not get any output.

For exmaple when kk=9, the dimensions are equal but still there is no output

for kk=9:9
    s1=t_d(t_d(:,1)>= CE_L(kk) & t_d(:,1)<= CE_U(kk),:);
    s2=v_d(v_d(:,1)>= CE_L(kk) & v_d(:,1)<= CE_U(kk),:);
    if length(s1) == length(s2)
        continue
    end
    S=[s1 s2];
    t=S(:, 1);
    t=(t-t(1));  %time (days) (initial offset removed)
    ser1=S(:, 2)-mean(S(:,2)); % series 1 minus its mean
    ser2=S(:, 4)-mean(S(:,4)); % series 2 minus its mean
end

and when i delete if condition i get output :

for kk=9:9
    s1=t_d(t_d(:,1)>= CE_L(kk) & t_d(:,1)<= CE_U(kk),:);
    s2=v_d(v_d(:,1)>= CE_L(kk) & v_d(:,1)<= CE_U(kk),:);
    S=[s1 s2];
    t=S(:, 1);
    t=(t-t(1));  %time (days) (initial offset removed)
    ser1=S(:, 2)-mean(S(:,2)); % series 1 minus its mean
    ser2=S(:, 4)-mean(S(:,4)); % series 2 minus its mean
end

[Ghazwan]

The structure of for loop of Torsten is correct. The issue you are having may be related to the data. Perhaps you need to practice the for-loop-continue structure on simpler matrices first.

Answer 1

[Andi]

for kk=9:9

s1=t_d(t_d(:,1)>= CE_L(kk) & t_d(:,1)<= CE_U(kk),:);

s2=v_d(v_d(:,1)>= CE_L(kk) & v_d(:,1)<= CE_U(kk),:);

if length(s1) ~= length(s2)

continue

end

S=[s1 s2];

t=S(:, 1);

t=(t-t(1)); %time (days) (initial offset removed)

ser1=S(:, 2)-mean(S(:,2)); % series 1 minus its mean

ser2=S(:, 4)-mean(S(:,4)); % series 2 minus its mean

end

Answer 2

[Allen]

@Adnan Barkat, it appears that your for-loop is functioning properly. However, you appear to be overwriting ser1 and ser2 during each iteration of the loop, which is returning only a single result from the last instance the loop runs.