Bundle Methods for Regularized Risk Minimization

Compute or check the structure of a cost matrix

1 | ```
costMatrix(y, C = c("0/1", "linear"))
``` |

`y` |
a factor representing the labels of the instances |

`C` |
either a cost matrix to check for consistency with labels in y, or a character string defining the standard matrix to compute. If a character string the accepted values are "0/1" for a 0-1 cost matrix or "linear" for linear cost. |

the cost matrix object

bmrm, ordinalRegressionLoss

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