Output of For-loop in 1 file

I have a for-loop for 5 measurements. The first time it runs I get the output for the first measurement. The second time it runs, I get the output for the second measurement. But the output for the first measurement disappears. I know I need to save, but I want to see all the outputdata into 1 file. In 5 columns next to each other. How do I do this?

for i_testen=1:length(data_stair_rise)
    RANK = data_stair_rise(1,i_testen).VideoSignals(:, strcmp('RANK',      data_stair_rise(1, i_testen).VideoSignals_headers))
    RANK = abs(RANK)
    figure;
    plot(RANK, 'g', 'LineWidth', 2);
    ylabel('Distance');
    xlabel('Datapoint');
    title('Walking stairs', 'FontSize', 16);
    legend({'Right ankle'})
    xy = ginput(2);
    xy(1,1) = 0;
    Afstand_1schrede = xy(2,2)-xy(1,2);}
end

I want to save 'Afstand_1schrede' in 1 file with five columns (representing the 5 measurements op 1 subject).

Answer 1

[Geoff Hayes]

Sam - you need to use Afstand_1schrede as an array rather than a scalar. Try the following

 % create the 1x5 array
 Afstand_1schrede = zeros(1,length(data_stair_rise));

 for i_testen=1:length(data_stair_rise)

     % etc.

     % save the measurement
     Afstand_1schrede(1,i_testen) = xy(2,2)-xy(1,2);
 end

[Sam]

Thanks for your answer, but Matlab gives the following error:

"Subscript indices must either be real positive integers or logicals."

[Geoff Hayes]

My mistake, should be i_testen instead of i in the update to the array.