将参数传递给GNUPLOT配置文件

类似这样的功能使您能够完全控制所需内容(抱歉,太快了,太脏了,只有Linux代码):

#include <iostream>
#include <fstream>
#include <cstdlib>

int main()
{
   std::ofstream f("myfile.plt");
   f << "#!/usr/local/bin/gnuplot\n";
   f << "reset\nset terminal pngcairo\n";
   //... the rest of what is needed
   std::string fn = "whatever.dat";
   f << "plot \"" << fn << "\" using 2:1 with linespoints\n";
   f.close();
   std::system( "chmod u+x myfile.plt" );
   std::system( "myfile.plt" );
}

(切换到 pngcairo 终端,产生的输出比 png ).

您可以只设置一个包含文件名的变量:

fprintf(gp, "filename=\"%s\";load \"config\"\n", file_name);

reset
set terminal png
set output "rp.png"
set title textcolor rgb "red" "R/P"
set yrange[0:110]
set xrange[0:110]
set xlabel "Rappel"
set ylabel "Précision"
set style data points
plot filename using 2:1 with linespoints