1D series to 2D stacked

Question

Eduardo Santos 2018-11-26

0
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https://ww2.mathworks.cn/matlabcentral/answers/432146-1d-series-to-2d-stacked

评论： Eduardo Santos 2018-11-27

Hi,

I`m trying to think in a best option to "convert" a 1d arrays to a 2d as follows:

B has a fixed size of 10000x(a prior know number, here 6), so it just need to stack number 1's regarding the number into the aray A.

A =

1 5 3 1 2 4

B =

....

0 1 0 0 0 0

0 1 0 0 0 1

0 1 1 0 0 1

0 1 1 0 1 1

1 1 1 1 1 1 % ROW 1

It can be done maniulating the arrays in a slow way, I would like to do much faster.

Thanks

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Kevin Chng 2018-11-27

Hi,

to stack number 1's regarding the number into the aray A?Do you mind to elaborate the relationship between A and B?

Walter Roberson 2018-11-27

Kevin, read the output B from the bottom upwards. The first column has one 1, which is the same number as A(1). The second column has five 1, which is the same number as A(2). And so on. So if you were to sum(B) then you would get A, with it always being the last so-many entries that are set to 1.

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