How can i run 2 for loops at the same time?

My problem with the code below is that i can't run the two for loops at the same time.I want to check for j=1 and p=1 which of the if conditions is true and do the actions,then check for j=2 and p=4 etc.But the way it is right now , it will check for j=1 and for every p possible untill it changes for j=2.

Any help will be much appreciated

function z=coder(y,d)
ymin=min(y);
Number_samples=length(y);
z=zeros(1,Number_samples*3);
for j=1:Number_samples  
    for p=1:3:Number_samples*3-2
        if y(j)==ymin
            z(1,p)=0;
            z(1,p+1)=0;
            z(1,p+2)=0;
        elseif y(j)==ymin+d
            z(1,p)=0;
            z(1,p+1)=0;
            z(1,p+2)=1;
        elseif y(j)==ymin+2*d
            z(1,p)=0;
            z(1,p+1)=1;
            z(1,p+2)=0;
        elseif y(j)==ymin+3*d
            z(1,p)=0;
            z(1,p+1)=1;
            z(1,p+2)=1;
        elseif y(j)==ymin+4*d
            z(1,p)=1;
            z(1,p+1)=0;
            z(1,p+2)=0;
        elseif y(j)==ymin+5*d
            z(1,p)=1;
            z(1,p+1)=0;
            z(1,p+2)=1;
        elseif y(j)==ymin+6*d
            z(1,p)=1;
            z(1,p+1)=1;
            z(1,p+2)=0;
        end
    end
end
end

[the cyclist]

I understand you want to process your data in a particular order. But when you say "etc", I don't fully understand the order or pattern you want.

For simplicity, suppose

Number_samples = 4;

Then your current code does these loops:

j = 1:4
p = 1:3:10

and therefore the (j,p) values will be, in order,

1,1
1,4
1,7
1,10
2,1
2,4
2,7
2,10
3,1
3,4
3,7
3,10
4,1
4,4
4,7
4,10

What do you want it to be?

I don't think that "running two for loops at the same time" is likely the right way to think about it. My guess is that you really need just one for loop, but your two (current) looping variables are related to each other.

[Petros Mata]

I want it to be:

(1,1)

(2,4)

(3,7)

(4,10)

etc.

If i use only one loop , lets say for j=1:Number_samples, i will have to change z(1,p) , z(1,p+1) , z(1,p+2) to z(1,j) , z(1,j+1) , z(1,j+2) for every if condition.Then for j=1 , i will see which if condition is true for y(1) and i will have a result to the z(1,1) , z(1,2) , z(1,3) , but then when j=2 i will put the next results to z(1,2) , z(1,3) , z(1,4) which two of them i already have. I used the two loops hoping that firstly it will check for j=1, which of the y(1) conditions is correct then for p=1 put z(1,1) , z(1,2) and z(1,3) and after that for j=2 , which of the y(2) conditions is correct then for p=4 put z(1,4),z(1,5),z(1,6) etc.

I hope what I'm trying to say is clear enough.

[Image Analyst]

When you say at the "same time" do you mean like in parallel, like with "parfor" in the Parallel Processing Toolbox?

Answer 1

[the cyclist]

From your reply to my comment, it seems to me that you really do only need one for loop. Instead of your

for j=1:Number_samples  
    for p=1:3:Number_samples*3-2
        if y(j)==ymin
            ...

you instead just need

for j=1:Number_samples  
    p = j+3; % No for loop here. Just need p to be j+3 in each j-loop
        if y(j)==ymin
            ...

That will give the (i,j) pattern

(1,1)
(2,4)
(3,7)
(4,10)