using 2 indexs for loop

Hi

how can i optimize this loop, if i want to include another indexing

mHome is an 15001x28 array

mBall is an 15001x3 array

for i=1:length(mHome) 
 output1(i,1)=pdist([mHome(i,1:2);mBall(i,1:2)]);
 output1(i,2)=pdist([mHome(i,3:4);mBall(i,1:2)]);
 output1(i,3)=pdist([mHome(i,5:6);mBall(i,1:2)]);
 output1(i,4)=pdist([mHome(i,7:8);mBall(i,1:2)]);
 output1(i,5)=pdist([mHome(i,9:10);mBall(i,1:2)]);
 output1(i,6)=pdist([mHome(i,11:12);mBall(i,1:2)]);
 output1(i,7)=pdist([mHome(i,13:14);mBall(i,1:2)]);
 output1(i,8)=pdist([mHome(i,15:16);mBall(i,1:2)]);
 output1(i,9)=pdist([mHome(i,17:18);mBall(i,1:2)]);
 output1(i,10)=pdist([mHome(i,19:20);mBall(i,1:2)]);
 output1(i,11)=pdist([mHome(i,21:22);mBall(i,1:2)]);
 output1(i,12)=pdist([mHome(i,23:24);mBall(i,1:2)]);
 output1(i,13)=pdist([mHome(i,25:26);mBall(i,1:2)]);
 output1(i,14)=pdist([mHome(i,27:28);mBall(i,1:2)]);
end

% I have tried this but it does not work
for i=1:length(mHome) 
    for k=1:size(mHome,2)
 output1(i,k)=pdist([mHome(i,k);mBall(i,1:2)]);
    end
 end

[madhan ravi]

madhan ravi:

output1(k,1)=pdist([mHome(k,(k*2)-1:k*2);mBall(k,1:2)]);
% Replaced i with k, assuming you have preallocated before the loop (good practice).

Morten Jørgensen:

Index in position 2 exceeds array bounds (must not exceed 28).
Error in Velocity (line 76)
 output2(k,1)=pdist([mHome(k,(k*2)-1:k*2);mBall(k,1:2)]);

i get this error mHome is a 15001x28 array

[madhan ravi]

Even after the below?

for k=1:size(mHome,2)
    output1(k,1)=pdist([mHome(k,(k*2)-1:k*2);mBall(k,1:2)]);
end

What the size of mBall?

[Morten Jørgensen]

mBall is a 15001x3 array.

but im only using the first 2 columms

my output should be a 15001x14 array

Answer 1

[Thorsten]

for i=1:length(mHome) 
    for k=1:2:size(mHome,2)-1
       output1(i,k)=pdist([mHome(i,k:k+1);mBall(i,1:2)]);
    end
 end

[Morten Jørgensen]

many thanks.

the only problem is that the output is a 15001x27 array and it should be a 15001x27 array.

right now everyother column is a colum with 0