脚本与gnuplot的 - 在中美战略经济对话 [英] Scripting with gnuplot--where sed

问题描述

所以我在寻找一些快速和肮脏的解决方案。

So I'm looking for some quick-and-dirty solution.

问题：

我想用绘制的gnuplot数据文件的特定部分。这可以。基本路线是这样的东西。

I am trying to plot a specific section of a data file with gnuplot. This is fine. The basic line goes something like

plot "<(sed -n '1,100p' pointsandstuff.dat)" u 1:log($4**2+$5**2) notitle

这工作得很好。下一步我想在我的标题包括数据的另一部分，即数据条目$ 3（其中列出的点是相同的，所以我可以从任何地方它解析）。我碰到的问题，因为虽然剧情似乎罚款，我似乎无法养活正则表达式的信息为标题。该的东西的例子并不的作品

This works just fine. The next step I want is to include in my title another part of the data, namely the data entry $3 (which for the points listed is identical, so I can parse it from anywhere). I run into problem because, while plot seems fine, I can't seem to feed regex info into 'title'. An example of something that doesn't work"

plot "<(sed -n '1,100p' pointsandstuff.dat)" u 1:log($4**2+$5**2) title "<(sed -n '1,1p' pointsandstuff.dat)"

（这将吐出一个整体的数据线，在理论上，但实际上我刚拿到冠军＆LT;（SED ...）

(This would spit out a whole data line, in theory, though in practice I just get the title "<(sed...")

我试着用一个bash脚本攻击这一点，但'$的，我用投掷bash脚本到迷惑不解：

I tried attacking this with a bash script, but the '$'s that I use throw the bash script into a tizzy:

#!/bin/bash


STRING=$(echo|sed -n '25001,25001p' pointsandstuff.dat)
echo $STRING


 gnuplot -persist << EOF
 set xrange[:] noreverse nowriteback
 set yrange[:] noreverse nowriteback

 eval "plot "<(sed -n '25001,30000p' pointsandstuff.dat)" u 1:log($4**2+$5**2) title $STRING


EOF

击不知道做什么用$ 4和5 $'做的。

Bash won't know what to do with '$4' and '$5'.

推荐答案

哈哈，谢谢大家。已经提出了几种方案现在 - 其中最简单的只从逃跑之前把这些$ S（我误以为gnuplot的不喜欢......）。为了白衣：

Aha, thanks all. Have come up with a few solutions by now--the simplest being just escaping those $s from before (which I mistakenly thought gnuplot disliked...). To whit:

STRING=$(echo|sed -n '1,1p' spointsandstuff.dat)
echo $STRING


 gnuplot -persist << EOF
 set xrange[:] noreverse nowriteback
 set yrange[:] noreverse nowriteback

 eval "plot "<(sed -n '1,100p' pointsandstuff.dat)" u 1:(log(\$4**2+\$5**2)) title '$STRING'
 !gv diag_spec.eps &

EOF

感谢所有，虽然 - 它已经用这个东西玩的好借口......这里的希望，如果任何可怜的灵魂看到这个剧本后，它可能会在它们更容易一些。

Thanks all, though--it's been a good excuse to play with this stuff...here's hoping that, if any poor soul sees this script later, it might be a bit easier on them.

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