Specific values in an Array

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ILAYDA GULSEN KOCAK 2021-5-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/833618-specific-values-in-an-array

编辑： ILAYDA GULSEN KOCAK 2021-5-19

Hi guys. I want to select specific values from an matrix array and use this values in further calculations.

lets say I have the following code:

R=[];
for i=1:1:5
    for y=5:1:10
        eq1=i*y
        %% To save the values:
        R=[R; i y eq1]
    end
end
%% The "R" Array would be like this:
1 5 5
1 6 6 
1 7 10
1 8 8
1 9 9 
1 10 10 
2 5 10
2 6 12
...

Now I want to select only the y value when eq1 is equal to 10 and save it in another variable. I hope you can help me.

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Answer 1

per isakson 2021-5-18

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/833618-specific-values-in-an-array#answer_702908

编辑：per isakson 2021-5-18

在 MATLAB Online 中打开

R=[];
for i=1:1:5
    for y=5:1:10
        eq1=i*y;
        %% To save the values:
        R=[R; i y eq1];
    end
end
another_variable = R( R(:,3)==10, 2 )
another_variable = 2×1
    10
     5

And see Logical indexing

"%% The "R" Array would be like this:" Whether that's true depends on the meaning of "like this".

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ILAYDA GULSEN KOCAK 2021-5-19

编辑：ILAYDA GULSEN KOCAK 2021-5-19

Thank you for your answer. I'm working with iterations and therefore I dont get even numbers. Is there also a way to save the y value of every loop when its closest to 10? (I must become one value for every loop).

I woul also very appreciate if you could show me how to select the last y value of every loop.

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