Re: [Gnuplot-info] 回?: system command in gnuplot

[Andrew R. <an...@gm...>]

Yes, you should be able to make a similar modification, something like:

plot "< bash -c 'paste  <(cat Q_byE_i*.txt) <(cat Q_byM_i*.txt)|awk
\'{if($1==16.0) { e[$3] += $4 }}END { for ( i in e) { print i , e[i]}}\''"

I can't test it out, so you might have to escape some additional characters
(* etc.).

When you are using a command that is this complicated, a way to simplify
things and reduce syntax / escape errors is to put the paste / awk script
in a separate file ("myscript.sh") and call that script from inside gnuplot:

plot "< bash ./myscript.sh"

Andy

On Mon, Dec 28, 2020 at 9:31 AM qin...@st... <
qin...@st...> wrote:

> Dear Andy
>
>
>
> Thank you very much.
>
> It worked. But I have another question.
>
> In fact, I tried to merge some data files, then plot a graph.
>
> The code is
>
> plot "< paste  <(cat Q_byE_i*.txt) <(cat Q_byM_i*.txt)|awk '{if($1==16.0)
> { e[$3] += $4 }}END { for ( i in e) { print i , e[i]}}'"  u 1:2
>
>
>
> The latter part of code about ‘awk’, I think there is no problem. Could I
> modify the code as the system("bash -c 'paste <(ls Q*) <(ls F*)'")?
>
>
>
> Qin
>
>
>
> ****************************************************
> 秦志豪
> 京都大学大学院 エネルギー科学研究科
> エネルギー基礎科学専攻 プラズマ・核融合基礎学分野
> 岸本研究室
> E-mail : qin...@st...
> ****************************************************
>
>
>
> *发件人: *Andrew Rasmussen <an...@gm...>
> *发送时间: *2020年12月28日 23:57
> *收件人: *qin...@st...
> *抄送: *gnu...@li...
> *主题: *Re: [Gnuplot-info] system command in gnuplot
>
>
>
> Hello,
>
>
>
> Your error comes from the fact that gnuplot is running the system command
> using the sh shell instead of bash (or whatever your usual shell is). You
> can get the command to be interpreted by bash like this:
>
>
>
> system("bash -c 'paste <(ls Q*) <(ls F*)'")
>
>
>
> Andy
>
>
>
> On Mon, Dec 28, 2020 at 4:11 AM qin...@st... <
> qin...@st...> wrote:
>
> Hello
>
> Now I am using gnuplot (Version 5.2 patchlevel 6) on a Linux system.
> The information of operating system as follow
> Linux version 4.4.162-94.72-default (geeko@buildhost) (gcc version 4.8.5
> (SUSE Linux) )
> LSB Version:    n/a
> Distributor ID: SUSE
> Description:    SUSE Linux Enterprise Server 12 SP3
> Release:        12.3
> Codename:       n/a
>
> My question:
>  I am trying to launch a system command in gnuplot like
> Terminal type is now 'qt'
> gnuplot> system(" paste <(ls Q*) <(ls F*)")
>
> show me the error message as
> sh: -c: line 0: syntax error near unexpected token `('
> sh: -c: line 0: ` paste <(ls Q*) <(ls F*)'
>
> But if I exit the gnuplot and run the command, it can work.
> qin@csc1:~/qin /txt> paste <(ls Q*) <(ls F*)
>
> any help would be much appreciated
> have a nice day
>
> ****************************************************
> 秦志豪
> 京都大学大学院 エネルギー科学研究科
> エネルギー基礎科学専攻 プラズマ・核融合基礎学分野
> 岸本研究室
> E-mail : qin...@st...
> ****************************************************
>
>
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