我有这个文件data.dat
:
Xstep Y1 Y2 Y3 Y4
332 1.22 0.00 0.00 1.43
336 5.95 12.03 6.11 10.41
340 81.05 81.82 81.92 81.05
394 11.76 6.16 10.46 5.87
398 0.00 0.00 1.51 1.25
1036 0.03 0.00 0.00 0.00
我可以使用此脚本将此数据绘制为直方图,hist-v1.gplot
(使用set style data histogram
):
set xlabel "X values"
set ylabel "Occurence"
set style data histogram
set style histogram cluster gap 1
set style fill solid border -1
set term png
set output 'hist-v1.png'
set boxwidth 0.9
# attempt to set xtics so they are positioned numerically on x axis:
set xtics ("332" 332, "336" 336, "340" 340, "394" 394, "398" 398, "1036" 1036)
# ti col reads the first entry of the column, uses it as title name
plot 'data.dat' using 2:xtic(1) ti col, '' u 3 ti col, '' u 4 ti col, '' u 5 ti col
并通过调用:
gnuplot hist-v1.gplot && eog hist-v1.png
但是,您会注意到 X 轴没有按数字缩放 - 它将 X 值理解为类别(即它是一个类别轴)。
hist-v2.gplot
我可以使用以下脚本(使用)获得更多数字 X 轴with boxes
:
set xlabel "X values"
set ylabel "Occurence"
# in this case, histogram commands have no effect
set style data histogram
set style histogram cluster gap 1
set style fill solid border -1
set term png
set output 'hist-v2.png'
set boxwidth 0.9
set xr [330:400]
# here, setting xtics makes them positioned numerically on x axis:
set xtics ("332" 332, "336" 336, "340" 340, "394" 394, "398" 398, "1036" 1036)
# 1:2 will ONLY work with proper xr; since we have x>300; xr[0:10] generates "points y value undefined"!
plot 'data.dat' using 1:2 ti col smooth frequency with boxes, '' u 1:3 ti col smooth frequency with boxes
并通过调用:
gnuplot hist-v2.gplot && eog hist-v2.png
此图像生成: 图像 hist-v2.png http://img266.imageshack.us/img266/6717/histv2.png
不幸的是,这里的条形“重叠”,因此很难阅读图表。
有没有办法让数字刻度 X 轴保持不变,但保持“条形”hist-v2.png
与 hist-v1.png
这个线程,“ Re: Histogram with x axis date error ”说你不能:
但是很难从数据文件中提取 x 坐标日期,...
但是,它指的是一个不同的问题......
谢谢,
干杯!