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

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Cai Chin 2020-12-25

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评论： Cai Chin 2020-12-26

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':

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Answer 1

Image Analyst 2020-12-25

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https://ww2.mathworks.cn/matlabcentral/answers/702527-how-do-i-add-values-to-an-array-on-a-conditional-basis#answer_584342

在 MATLAB Online 中打开

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"?

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Image Analyst 2020-12-26

在 MATLAB Online 中打开

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, :);