Half-vectorisation function in MATLAB

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Muhammad Prasetyo
Muhammad Prasetyo 2020-5-27
编辑： Stephen23 2020-5-27
Is there a specific matlab function for a half vectorisation that from square matrix to row vector? I know we can use the reshape function for full vectorization from a 2x2 square matrix to column vector of 4x1.
Example of Half-vectorisation:
[x1x1,x1x2;x2x1,x2x1] to a [x1x1;2*x1x2; x2x2] so from 2x2 square matrix to row vector of 3x1
or
[x1x1,x1x2,x1x3;x2x1,x2x2,x2x3;x3x1,x3x2,x3x3] to a [x1x1;2*x1x2;2*x1x3;x2x2;2*x2x3;x3x3] from 3x3 square matrix to a row vector of 6x1
so its similar to taking the upper triangular of the square matrix

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