GNUPlot Manual

144 gnuplot 4.0 36 SET-SHOW
Any character is allowed in the string, but must match exactly. \t (tab) is recognized. Backslash-octals
(\nnn) are converted to char. If there is no separating character between the time/date elements, then
%d, %m, %y, %H, %M and %S read two digits each, %Y reads four digits and %j reads three digits.
%b requires three characters, and %B requires as many as it needs.
Spaces are treated slightly differently. A space in the string stands for zero or more whitespace characters
in the file. That is, "%H %M" can be used to read "1220" and "12 20" as well as "12 20".
Each set of non-blank characters in the timedata counts as one column in the using n:n specification.
Thus 11:11 25/12/76 21.0 consists of three columns. To avoid confusion, gnuplot requires that you
provide a complete using specification if your file contains timedata.
Since gnuplot cannot read non-numerical text, if the date format includes the day or month in words,
the format string must exclude this text. But it can still be printed with the "%a", "%A", "%b", or
"%B" specifier: see set format (p. 66) for more details about these and other options for printing
timedata. (gnuplot will determine the proper month and weekday from the numerical values.)
See also set xdata (p. 146) and Time/date (p. 27) for more information.
Example:
set timefmt "%d/%m/%Y\t%H:%M"
tells gnuplot to read date and time separated by tab. (But look closely at your data — what began as
a tab may have been converted to spaces somewhere along the line; the format string must match what
is actually in the file.) See also
time data demo.
36.65 Title
The set title command produces a plot title that is centered at the top of the plot. set title is a special
case of set label.
Syntax:
set title {""} {}{,} {"{,}"}
{{textcolor | tc} {lt | default}}
show title
Specifying constants or as optional offsets for the title will move the title or
character screen coordinates (not graph coordinates). For example, "set title ,-1" will change
only the y offset of the title, moving the title down by roughly the height of one character.
is used to specify the font with which the title is to be written; the units of the font
depend upon which terminal is used.
textcolor lt sets the text color to that of line type .
set title with no parameters clears the title.
See syntax (p. 26) for details about the processing of backslash sequences and the distinction between
single- and double-quotes.
36.66 Tmargin
The command set tmargin sets the size of the top margin. Please see set margin (p. 77) for details.
36.67 Trange
The set trange command sets the parametric range used to compute x and y values when in parametric
or polar modes. Please see set xrange (p. 148) for details.