How do I combine matrices in a specific order?

for j=1:5

k=num2str(j); extension='.asc';
filename=strcat('Image',k,extension)

[Profiles]=readProfiles(filename); % Read profiles
ProfilesALL(:,j)=Profiles; 

end

ProfISO_2_5=(ProfilesALL(:,1)+ProfilesALL(:,2))/2;
ProfISO_7_5=(ProfilesALL(:,2)+ProfilesALL(:,3))/2;
ProfISO_15=(ProfilesALL(:,3)+ProfilesALL(:,4))/2;
ProfISO_25=(ProfilesALL(:,4)+ProfilesALL(:,5))/2;

How do I occupy a new matrix, A, to be in this order:

       A(:,1)=ProfilesALL(:,1);
       A(:,2)=ProfISO_2_5;
       A(:,3)=ProfilesALL:,2);
       A(:,4)=ProfISO_7_5;
       A(:,5)=ProfilesALL(:,3);
       A(:,6)=ProfISO_15;
       A(:,7)=ProfilesALL(:,4);
       A(:,8)=ProfISO_25;
       A(:,9)=ProfilesALL(:,5);

[Matt Kindig]

The code you presented to define A is fine. I suppose you could make it slightly shorter with:

A(:,1:2:9) = ProfilesALL(:,1:5);   %odd columns only
A(:,2:2:8) = [ProfISO_2_5, ProfISO_7_5, ProfISO_15, ProfISO_25];

[Jan]

A vote for Matt's answer, although it is hidden in the comment section.

[Yun Inn]

Thank you!

Answer 1

[Jan]

This procedure is actually a linear interpolation:

A = interp1(1:5, transpose(ProfilesALL), 1:0.5:5);

I cannot test this currently, such that I'm not sure about the transpose().

This is a leaner method to create the file name:

filename = sprintf('Image%d.asc', k);

Letting an array gorw iteratively wastes time, but I do not think that this can be measured for the small number of 5 loops. Nevertheless, I suggest to pre-allocate in general. Either allocate ProfilesALL at once by zeros(), when you know the size at the beginning. Or perform an implicit allocation by inserting the last element at first:

for j = 5:-1:1
  ...