如何從C程序中使用gnuplot來繪圖

Question

我想繪製從C程序（Windows 7）內的圖形 我已經維護了一個圖點的數組，例如x []和y1 []，y2 [ ]和y3 []。我想繪製固定x點的多個y點。 如何從我的程序中使用gnuplot來繪製圖形？

Answer 1

不是最完美的解決方案，但這應該工作：

int main(int argc, char **argv){ 
    FILE * temp = fopen("data.temp", "w"); 
    FILE * gnuplotPipe = popen ("gnuplot -persistent", "w"); 
    for(Iterate over your array so that you create another exact temporal array){ 

     float a, b, c; 

     x = something; 
     y1 = something; 
     y2 = something; 
     y3 = something; 

     fprintf(temp, "%d %d %d %d \n", x, y1, y2, y3); 
    } 

    fprintf(gnuplotPipe, "(here whatever you want to tell gnuplot to do) i.e plot 'data.temp' using 1:2 with lines, etc");  

    return 0; 
} 

或者你可以這樣做：

int plot(){ 
    system("gnuplot -p -e \"(Here put whatever you would put in gnuplot as if you were ploting manually)\""); 
    return 0; 
}