"USR" parameter

Problem:

You can see this parameter in many places, such

Text (PAR ("USR") [1] + 5, par ("USR") [4] + 12, "NBA per game performance of top 50 corers ", XPD = true, font = 2, cex = 1.5)

Answer:

Once a plot has been created, par ("USR") returns a vector with the extreme coordinates of the user's plow.region. these can be used to place text and legends into a corner of a plot. the coordinates are,
In order, xleft, xright, ybottom, and ytop. Note the use of the adj parameter in the callto the text () function; these adjust the position of the text.


# Create the plot. This sets the "USR" coordinates.

Plot (1: 10)

# PAR ("USR") returns a vector containing xleft, xright, ybottom, ytop.

USR <-PAR ("USR ")

# Place the text. Note the use of the adj parameter.

# Left top corner:

Text (USR [1], USR [4], "Left top", adj = C (0, 1), Col = "blue ")

# Left bottom corner:

Text (USR [1], USR [3], "Left Bottom", adj = C (0, 0), Col = "blue ")

# Right top corner:

Text (USR [2], USR [4], "Right top", adj = C (1, 1), Col = "blue ")

# Right bottom corner:

Text (USR [2], USR [3], "Right Bottom", adj = C (1, 0), Col = "blue ")