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`runcum(`

`x`, [[, `axes`], `width`] [, /partial_width])

Running sum of

along the axes indicated in
`x`

over numbers of elements picked from
`axes`

.
`width`

If

is not specified or negative, then `axis`

is regarded as a one-dimensional array. In that case,
`x`

must be scalar.
`width`

`/partial_width`

determines handling at the edges: if it is set,
then the edges are filled with the partial-width value centered on each
edge element of interest; if it is not set (`/no..`

) then the edges
are filled with the nearest full-width value.