Returns a vector whose elements are the cumulative sums, products, minima or maxima of the elements of the argument.

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`x` |
a numeric or complex (not |

These are generic functions: methods can be defined for them
individually or via the `Math`

group generic.

A vector of the same length and type as `x`

(after coercion),
except that `cumprod`

returns a numeric vector for integer input
(for consistency with `*`

). Names are preserved.

An `NA`

value in `x`

causes the corresponding and following
elements of the return value to be `NA`

, as does integer overflow
in `cumsum`

(with a warning).

`cumsum`

and `cumprod`

are S4 generic functions:
methods can be defined for them individually or via the
`Math`

group generic.
`cummax`

and `cummin`

are individually S4 generic functions.

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
*The New S Language*.
Wadsworth & Brooks/Cole. (`cumsum`

only.)

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