Very tricky:Manipulation with complex array

Question

Jovan Jovovic 2022-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/1807550-very-tricky-manipulation-with-complex-array

编辑： Jovan Jovovic 2022-9-19

I need to write a m.file function for this.

For example

array X = [4, 1, 1, 3, 8, 12], I need to make the array which will contain bold ones as well Y = [4, 1, 5, 1, 3, 4, 8, 12, 20].

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Jovan Jovovic 2022-9-19

I was thinking to make 3 sub arrays,one array will go with even(2:2:end),one will go with odd(1:2:end),and one will be sum of first element of the both arrays.

After that i would combine it first element of each array,than second element of each array.

The problem is that i need it to make in a m.file with kinda a algorithm method.

However i will try to make it with function reshape.

If you have some additional advice i would be thankful

Jovan Jovovic 2022-9-19

Thank you tho

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Answer 1

Fabio Freschi 2022-9-19

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https://ww2.mathworks.cn/matlabcentral/answers/1807550-very-tricky-manipulation-with-complex-array#answer_1056160

编辑：Fabio Freschi 2022-9-19

在 MATLAB Online 中打开

Following @Paul suggestion

% original vector
X = [4, 1, 1, 3, 8, 12];
% reshape to have 2xN vector
W = reshape(X,2,[]);
% calculate the sum
S = sum(W,1);
% concat the vector and reshape
Y = reshape([W; S],1,[])
Y = 1×9
     4     1     5     1     3     4     8    12    20

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Fabio Freschi 2022-9-19

Why using for loops when the vectorized version is effective, cleaner and more efficient?

Jovan Jovovic 2022-9-19

编辑：Jovan Jovovic 2022-9-19

Because this tasks want from me to learn logic of the Matlab.I know its absolutely better like this.

But maybe i will get problem like this and i will be stucked if i dont know some function.

Write a m.file which is asking to enter array X (integer numbers),which will make a new array Y .Elements of the array Y are sum from even digits of elements array X. If some element of array X is not inteneger,make a comment about error.

For example X = [81, 19, 102, 22, 12, 21] Y = [8, 0, 2, 4, 2, 2]

And I will need to use the loop to see is there a even digit in every number

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