copying specific elements of an array to another.

Question

Leon Ellis 2021-8-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1438179-copying-specific-elements-of-an-array-to-another

回答： Stephen23 2021-8-21

Hi, I want to copy certain values from an array with a known size to an array with an unspesified size based on the critaria.

for i=1:length(y)

if abs(y(i))>0.001

y(i)=g(i);

end

So basically, I want to get all values in the array y that are greater than 0.001 to be copied into a seperate array g, but I'm struggling. Thanks in advance!

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Answer 1

Stephen23 2021-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/1438179-copying-specific-elements-of-an-array-to-another#answer_772004

在 MATLAB Online 中打开

Forget about loops, the simple and efficient MATLAB approach is to use logical indexing:

g = y(y>0.001)

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Answer 2

Awais Saeed 2021-8-21

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1438179-copying-specific-elements-of-an-array-to-another#answer_771969

在 MATLAB Online 中打开

y = reshape(randn(3)/100,1,[]);
idx = 0;
for col = 1:1:size(y,2)
    if (y(col) > 0.001)
        idx = idx+1;
        g(idx) = y(col);    % store values > 0.001 in g
    end
end
fprintf('y: ')
fprintf('%f ', y)           % original data
fprintf('\ng: ')
fprintf('%f ', g)           % values > 0.001