{<system>} <x>, {<system>} <y> {,{<system>} <z>}

Each <system> can either be **first**, **second**, **polar**, **graph**, **screen**, or **character**.

**first** places the x, y, or z coordinate in the system defined by the left and bottom axes; **second** places it in the system defined by the x2,y2 axes (top and right); **graph** specifies the area within the axes — 0,0 is bottom left and 1,1 is top right (for splot, 0,0,0 is bottom left of plotting area; use negative z to get to the base — see **set xyplane**); **screen** specifies the screen area (the entire area — not just the portion selected by **set size**), with 0,0 at bottom left and 1,1 at top right. **character** coordinates are used primarily for offsets, not absoute positions. The **character** vertical and horizontal size depend on the current font.

**polar** causes the first two values to be interpreted as angle theta and radius r rather than as x and y. This could be used, for example, to place labels on a 2D plot in polar coordinates or a 3D plot in cylindrical coordinates.

If the coordinate system for x is not specified, **first** is used. If the system for y is not specified, the one used for x is adopted.

In some cases, the given coordinate is not an absolute position but a relative value (e.g., the second position in **set arrow** ... **rto**). In most cases, the given value serves as difference to the first position. If the given coordinate belongs to a log-scaled axis, a relative value is interpreted as multiplier. For example,

set logscale x set arrow 100,5 rto 10,2

plots an arrow from position 100,5 to position 1000,7 since the x axis is logarithmic while the y axis is linear.

If one (or more) axis is timeseries, the appropriate coordinate should be given as a quoted time string according to the **timefmt** format string. See **set xdata** and **set timefmt**. **Gnuplot** will also accept an integer expression, which will be interpreted as seconds relative to 1 January 1970.

Copyright 1986 - 1993, 1998, 2004 Thomas Williams, Colin Kelley

Distributed under the gnuplot license (rights to distribute modified versions are withheld).