绘制gnuplot

Question

我想在y轴上绘制数据，在x轴上绘制日期，我将它全部放在列中。我有格式

的数据

2016.0000000000000  10.000000000000000  14.000000000000000  117.62999700000000     
2016.0000000000000  10.000000000000000  13.000000000000000  116.98000300000000     
2016.0000000000000  10.000000000000000  12.000000000000000  117.33999600000000     
2016.0000000000000  10.000000000000000  11.000000000000000  116.30000300000000     
2016.0000000000000  10.000000000000000  10.000000000000000  116.05000300000000     
2016.0000000000000  10.000000000000000  7.0000000000000000  114.05999799999999     
2016.0000000000000  10.000000000000000  6.0000000000000000  113.88999900000000

在文件中，其中结构为年，月，日，数据，标签为分隔符。我尝试过的代码是：

set xdata time
set timefmt "\"%Y\t%m\t%d\""
set xrange ['"2016\t10\t14"':'"2006\t10\t16"']

plot "data.txt" u 1:2

但显然这并不是将日期视为x值，将数据视为y值，因为运行时出现此错误消息：

line 5: warning: Skipping data file with no valid points
line 5: Can't plot with an empty x range!

第5行指的是包含plot命令的行。我如何告诉程序我想绘制的是数据与日期？

Answer 1

set xdata time
set timefmt "%Y %m %d"
set xrange ["2016 10 06":"2006 10 16"]

plot "data.txt" u (sprintf("%d %d %d",$1,$2,$3)):4