How can I create a vector

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Javier Imaz Higuera 2022-8-23

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评论： Matt J 2022-8-23

I want to create a vector b from the vector a, such as:

a = [2 4 3]

b = [1/2 1/2 1/4 1/4 1/4 1/4 1/3 1/3 1/3]

(note that there are as many fractions in b, as the sum of the vector a. Also, the number of different fractions correspond with the individual values of a)

Is there any easy way to generalize this example?

Thanks

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Javier Imaz Higuera 2022-8-23

found a way:

b=[];

for i = 1:length(a)

b=[b,a(i).*ones(a(i),1)']

end

b=b.^(-1);

Matt J 2022-8-23

You should be getting Code Analyzer messages discouraging you from growing b iteratively in the loop.

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回答（1 个）

Matt J 2022-8-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1784100-how-can-i-create-a-vector#answer_1031225

编辑：Matt J 2022-8-23

在 MATLAB Online 中打开

a=[2,4,3];
b=1./repelem(a,a)
b = 1×9
    0.5000    0.5000    0.2500    0.2500    0.2500    0.2500    0.3333    0.3333    0.3333

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MATLAB Language Fundamentals Matrices and Arrays Creating and Concatenating Matrices

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