gprintf

The string function gprintf("format",x) uses gnuplot's own format specifiers, as do the gnuplot commands set format, set timestamp, and others. These format specifiers are not the same as those used by the standard C-language routine sprintf(). gprintf() accepts only a single variable to be formatted. Gnuplot also provides an sprintf("format",x1,x2,...) routine if you prefer. For a list of gnuplot's format options, see format specifiers.