gnuplot的“统计信息"命令意外的分钟&“超出范围"结果 [英] gnuplot "stats" command unexpected min & "out of range" results

问题描述

我正在尝试开发直方图脚本.该情节本身似乎是正确的，但是我有一些问题或疑问:

I’m trying to develop a histogram script. The plot itself seems correct, but I have some problems or questions:

1. 我不明白为什么统计"输出显示我的数据文件有超出范围"的点.是什么意思?
2. 统计"最小值看上去也不正确.从数据文件中，最小值= -0.0312，但是统计信息报告为0.0.

脚本:

# Gnuplot histogram from "Gnuplot In Action", 13.2.1 Jitter plots and histograms (p. 256)

# these functions put data points (x) into bins of specified width
bin(x,width)    = width*floor(x/width)

binwidth = 0.01
set boxwidth binwidth

# data file
data_file = "sorted.csv"
png_file    = "sorted.png"
datapoint_count = 14

# taking explanations from the data file
set style data linesp
set key autotitle columnheader

set datafile separator ","  # CSV format

# histogram
myTitle = "Histogram from \n" . data_file
set title myTitle
set style fill solid 1.0
set xlabel "Slack"
set mxtics
set ylabel "Count"
set yrange [0:*] # min count is always 0

set terminal png    # plot file format
set output png_file # plot to file

print "xrange="
show xrange
print "yrange="
show yrange

stats data_file using ($1)
print "STATS_records=", STATS_records
print "STATS_invalid=", STATS_invalid
print "STATS_blank=", STATS_blank
print "STATS_min=", STATS_min
print "STATS_max=", STATS_max

plot  data_file using (bin($1,binwidth)):(1) smooth frequency with boxes

数据文件:

slack
-0.0312219
-0.000245109
-4.16338e-05
-2.08616e-05
-1.82986e-05
8.31485e-06
1.00136e-05
1.23084e-05
0
0.000102907
0.000123322
0.000138402
0.19044
0.190441

输出:

gnuplot sorted.gp
Could not find/open font when opening font "arial", using internal non-scalable font
xrange=

        set xrange [ * : * ] noreverse nowriteback  # (currently [-10.0000:10.0000] )

yrange=

        set yrange [ 0.00000 : * ] noreverse nowriteback  # (currently [:10.0000] )


* FILE: 
  Records:      9
  Out of range: 5
  Invalid:      0
  Blank:        0
  Data Blocks:  1

* COLUMN: 
  Mean:          0.0424
  Std Dev:       0.0792
  Sum:           0.3813
  Sum Sq.:       0.0725

  Minimum:       0.0000 [3]
  Maximum:       0.1904 [8]
  Quartile:      0.0000 
  Median:        0.0001 
  Quartile:      0.0001 

STATS_records=9.0
STATS_invalid=0.0
STATS_blank=0.0
STATS_min=0.0
STATS_max=0.190441

推荐答案

如果将单个列提供给 stats 命令，则使用 yrange 选择范围从此列.

If you give a single column to the stats command, the yrange is used to select the range from this column.

乍一看，这没有任何意义，但其行为类似于 plot 命令，该命令只有一列，在这种情况下，该列为y值，并且选择了行号作为x值.

At first sight this doesn't make sense, but behaves like a plot command which has only a single column, in which case this single column is the y-value and the row number is choosen as x-value.

因此，只需将 set yrange 部分移到 stats 命令的后面即可.

So, just move the set yrange part behind the stats command.

data_file = 'sorted.csv'
stats data_file using 1
show variables all
set yrange [0:*]
plot data_file ...

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