gnuplot:如何绘制最大值和/或最小值 [英] Gnuplot: how to plot max and /or min value

问题描述

如何显示最高和/或分钟绘图中图形在适当位置的值会自动显示出来吗?

How can I show the max. and/or the min. value(s) of of a graph in a plot at their appropriate position automatically?

推荐答案

您可以使用stats命令半自动"执行此操作.此命令可以从数据集中提取一些统计值，但需要进行一些重做:

You can do this "semi-automatically" using the stats command. This command can extract some statistical values from a data set, but requires some reworking:

1. 假设数据文件有两列，第一列的x值，第二列的y值，提取最小和最大y值

1. Extract the minimum and maximum y-values, assuming that your data file has two columns, the x-value in the first, the y-values in the second column

stats 'file.dat' using 2 nooutput name 'Y_'

这将为您提供变量Y_min和Y_max中的最小/最大y值，但没有相应的x值.

This gives you the min/max y-values in the variables Y_min and Y_max, but not the corresponding x-value.

上一步仅给您获得相应的索引，这要求您再次运行stats才能获得x值:

The previous step gives you only get the respective indices, which requires you to run stats again in order to get the x-values:

 stats 'file.dat' using 1 every ::Y_index_min::Y_index_min nooutput
 X_min = STATS_min
 stats 'file.dat' using 1 every ::Y_index_max::Y_index_max nooutput
 X_max = STATS_max

在相应坐标处设置标签和/或点

Set labels and/or points at the respective coordinates

set label 1 sprintf("%.2f", Y_min) center at first X_min,Y_min point pt 7 ps 1 offset 0,-1.5
set label 2 sprintf("%.2f", Y_max) center at first X_max,Y_max point pt 7 ps 1 offset 0,1.5
...
plot ...

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