r - Add vertical lines to a graph -

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i'm wanting add vertical dotted/dashed on top of time series graph @ intervals.

would put command in abline arguments or there way?

use grid:

nx, ny - number of cells of grid in x , y direction. when null, per default, grid aligns tick marks on corresponding default axis (i.e., tickmarks computed axticks). when na, no grid lines drawn in corresponding direction.

example:

plot(1:5) grid(nx = null, ny = na)

enter image description here


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