`\vector(x-slope,y-slope){length}`

The `\vector` command draws an arrow of the specified length and slope
with the arrow head at the opposite end of the line from the
reference point (see `\put`).

The slope is determined by `(x-slope,y-slope)` which are signed
integers of magnitude less than or equal to 4 and which have no common
divisor except for plus or minus one; For example (1,0) is a horizontal
arrow pointing right; (1,1) gives a slope of
45 degress; (0,1) is a vertical arrow pointing up; (-1,1) is at 135 degrees.

The **horizontal** extent of the arrow is given by the
`length` parameter, except in the case of a vertical arrow in
which case `length` specifies the vertical height.

See also Environments, picture

See also

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Revised: Sheldon Green, 12 May 1995.