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.help lintran Mar84 lists
.nf
List Operator LINTRAN
Performs a linear translation on each element of the input list,
producing a transformed list as output.
lintran (list)
An input line may contain a variable number of fields. Two fields of each
input line are designated as the x and y coordinates (default cols 1,2).
All other fields are to be preserved across the transformation. Lines which
begin with a sharp ("#") are considered comment lines and are passed on to
the output unmodified, as are blank lines. If either if x or y are indefinite
and a pure translation or scale change is being performed, the corresponding
output coordinate will be indefinite. If either input coordinate is indefinite
and a rotation is being performed, both output coordinates will be indefinite.
Parameters:
list
List or lists to be transformed (template).
xcol = 1, ycol = 2
Columns containing the x and y coordinates.
x1 = 0.0, y1 = 0.0
Current origin.
xscale = 1.0, yscale = 1.0
Scale factor to be applied to the input coordinates, relative
to the current origin [x0,y0].
angle = 0.0
Rotation angle about the origin [x0,y0].
x2 = 0.0, y2 = 0.0
New origin; applied after scaling and rotating the input coords.
Examples:
Shift a coordinate list from the default origin [0,0] to the origin
[10.5,30], saving the result in the file "newlist":
lintran list, x2=10.5, y2=30, > newlist
Apply a shift of +3.4 units in x, -1.3 units in y to the input list
read from the standard input, writing the output list on the standard
output:
(list stream) | lintran x2=3.4, y=-1.3
Take x and y from columns 2 and 3, rotate 45 degrees:
lintran list, xcol=2, ycol=3, angle=45
.fi
.endhelp
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