Help with For loop and Indexing

Assuming A is ECG data in this form 1000 X 243 double, how do I make MATLAB read or perform a task on the 1st column alone, then the 2nd column ...... like that till the last being 1000th column.

I am new to MATLAB and I have tried to figure this out but couldnt.

Please any help...

Answer 1

[Walter Roberson]

subplot(1,3,1)
plot(A(:,1));
subplot(1,3,2)
plot(A(:,2));
subplot(1,3,3)
plot(A(:,3));

However, I suspect that what you really want is something that turns out to be the same as

plot(A)

This will plot the first column of A as one line, and in the _same_ plot but a different color will plot the second column, and in the same plot but a third color will plot the third column.

[Ola Ola]

Please I have given a better description of my problem now.

[Walter Roberson]

for colnum = 1 : size(A,2)
    this_data = A(:, column);
    process this_data
end

However with 1000 x 243 this would execute 243 times, with the last one being column 243, whereas you asked for the last one to be column 1000. You do not have 1000 columns. If you want to work row by row, then

for rownum = 1 : size(A,1)
    this_data = A(rownum, :);
    process this_data
end

[Ola Ola]

Thanks for the answer