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This function maps an integer vector to a new vector where the unique values are replaced with consecutive integers starting from 0.
encodeToZeroIndexed(x)
An integer vector with values from 0 to (number of unique values - 1), maintaining the original order structure.
An integer vector.
encodeToZeroIndexed(c(10, 20, 10, 30)) # Returns: 0 1 0 2
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