How do I add values to an array on a conditional basis?

Hi, I am trying to add values to a pre-allocated array based on whether the row number belongs to a set of values. In this example, I have generated an array with 7 rows and 900 columns, and only when the row number of another array matches the numbers in a specified vector, do I want the column values from that array to be added to my new array. At the moment, it keeps changing the dimension of the array so I am left with zeros in several of the unfilled positions. Any suggestions would be greatly appreciated, thanks in advance.

abnormal_cycles_5 = [95, 94, 92, 91, 79, 72, 1];
values_v_5_abnormal = zeros(length(abnormal_cycles_5), 900);
values_w_5_abnormal = zeros(length(abnormal_cycles_5), 900);
for i = 1:95
    if ismember(i, abnormal_cycles_5)
        values_v_5_abnormal(i, 1:900) = values_v_5(i, 1:900);
        values_w_5_abnormal(i, 1:900) = values_w_5(i, 1:900);
    end
end

I have attached the variable values 'values_v_5' and 'values_w_5':

Answer 1

[Image Analyst]

Do you mean like this:

abnormal_cycles_5 = [95, 94, 92, 91, 79, 72, 1]; % 7 columns, 1 row
values_v_5_abnormal = zeros(length(abnormal_cycles_5), 900); % 7 rows, 900 columns.
values_w_5_abnormal = zeros(length(abnormal_cycles_5), 900); % 7 rows, 900 columns.
values_w_5_abnormal(:, abnormal_cycles_5) = repmat(abnormal_cycles_5', 1, 7);

where the 7 element vector "abnormal_cycles_5" gets loaded into columns 95, 94, 92, 91, 79, 72, and 1 of the 2-D matrix "values_w_5_abnormal"?

[Cai Chin]

Hi, thanks for your answer. The vector 'abnormal_cycles_5' represents the index positions of the rows of a separate array 'values_v_5' (or values_w_5) with dimensions 95x900 that I would like to add into a new array 'values_v_5_abnormal' (or values_w_5_abnormal) with dimensions 7x900. At this point, it does not matter that the index positions are no longer conserved, it's just that I only want to keep the rows and columns at these positions instead of all 95 rows. Thanks

[Image Analyst]

You keep forgetting to attach separate array 'values_v_5' (or values_w_5) with dimensions 95x900. We never knew about that until now. Please attach all variables in a .mat file.

save('answers.mat', 'values_v_5', 'values_w_5', 'abnormal_cycles_5'); 

and whatever else is needed.

[Cai Chin]

Sorry about the confusion, I have now uploaded the variable values for values_v_5 and values_w_5

[Image Analyst]

Do you mean like this:

v = load('values_v_5.mat')
values_v_5 = v.values_v_5;
w = load('values_w_5.mat')
values_w_5 = w.values_w_5;

abnormal_cycles_5 = [95, 94, 92, 91, 79, 72, 1]; % 7 columns, 1 row
values_v_5_abnormal = zeros(length(abnormal_cycles_5), 900); % 7 rows, 900 columns.
values_w_5_abnormal = zeros(length(abnormal_cycles_5), 900); % 7 rows, 900 columns.

values_v_5_abnormal = values_v_5(abnormal_cycles_5, :);
values_w_5_abnormal = values_w_5(abnormal_cycles_5, :);

[Cai Chin]

Yes, thank you very much!