A utility function for `coxdual`

that returns values from
a step function given its increments over time.

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`jump` |
a matrix whose columns give increments in the (possibly multivariate) step function, corresponding time points and strata. |

`time` |
an integer or character value indicating the column index or name of
the time variable in the matrix |

`stratum` |
integer or character value for the column index or name of the
stratifying variable in the matrix |

A matrix of the same dimension as `jump`

.

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