Find Number of values filtered through conditioned for loops

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Tareq Khreim
Tareq Khreim 2020-9-28
回答： David Hill 2020-9-28
I have a for-loop in which I'm generating x & y values and filtering them under conditions to prepare them for another, nested for-loop. I want to know how to get the amount of values left after filtering so I can run the next for-loop for that many iterations. As below, I start with 100 random values and have them filtered by an if statement, so how can I get the count of the filtered values? If I try to fill in a matrix it only fills in values from the last iteration.
filtered_array=[];
for i=1:100
x = rand;
y = rand;
if (abs(x)<=1/2) && (abs(y)<=1/2) % Filtering
filtered_array = [x y] % Maybe populate a matrix?
for i=1:length(filtered_array) % for loop only iterating as few times as it needs
...
end
end
end

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回答（1 个）

David Hill
David Hill 2020-9-28
No loops needed.
x=rand(1,100);
y=rand(1,100);
filtered_array=[x(abs(x)<=.5),y(abs(y)<=.5)];
a=length(filtered_array);%this provides the length

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