Storage results in an array

Question

Chuming Wei 2021-10-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1568418-storage-results-in-an-array

回答： Chunru 2021-10-21

采纳的回答： KSSV

Hello

I want storage results in an array

for example

I have

for x=[2,3,4,5,6];
    if x>4
        y=x^2
    else
        y=x+2
    end
end

Then I got

I want y=[4,5,6,25,36]

Thank you

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Answer 1

KSSV 2021-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/1568418-storage-results-in-an-array#answer_813173

编辑：KSSV 2021-10-21

x=[2,3,4,5,6];
y=zeros(size(x)) ; 
for i = 1:length(x)
    if x(i)>4
        y(i)=x(i)^2
    else
        y(i)=x(i)+2
    end
end

No loop is needed to achieve this:

x=[2,3,4,5,6];
y=x+2;
y(x>4)=x(x>4).^2 ; 
y

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Answer 2

Akira Agata 2021-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/1568418-storage-results-in-an-array#answer_813178

Instead of uisng for-loop, you can do this task by vectorizing, like:

x = [2, 3, 4, 5, 6];
y = x + 2;
idx = x > 4;
y(idx) = x(idx).^2;
disp(y)
     4     5     6    25    36

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Answer 3

Chunru 2021-10-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1568418-storage-results-in-an-array#answer_813183

% Without loop
x=[2,3,4,5,6];
y=x;
y(x>4)=x(x>4).^2;
y(x<=4)=x(x<=4)+2
y = 1×5
     4     5     6    25    36
% With loop
x = [2,3,4,5,6];
y = zeros(size(x));
for i=1:length(x)
    if x(i)>4
        y(i)=x(i)^2;
    else
        y(i)=x(i)+2;
    end
end
y
y = 1×5
     4     5     6    25    36