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

[<qin...@st...>]

Dear Andy
As your advice, we can reduce syntax / escape errors by put the paste / awk script in a separate file ("myscript.sh").
Then call it from inside gnuplot as plot "< bash ./myscript.sh"
But if the data  file name (Q_byE_i*.txt) is a string variable and “16.0” of  “if($1==16.0”  in awk part is also a variable,
How can I pass these variables from gnuplot into myscript.sh.

Because I'm not very familiar with linux, my questions might be very basic or stupid.
please forgive me.
****************************************************
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...
****************************************************

?件人: Andrew Rasmussen<mailto:an...@gm...>
?送??: 2020年12月29日 1:13
收件人: qin...@st...<mailto:qin...@st...>
抄送: gnu...@li...<mailto:gnu...@li...>
主?: Re: 回?: [Gnuplot-info] system command in gnuplot

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...<mailto:qin...@st...> <qin...@st...<mailto: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...<mailto:qin...@st...>
****************************************************

?件人: Andrew Rasmussen<mailto:an...@gm...>
?送??: 2020年12月28日 23:57
收件人: qin...@st...<mailto:qin...@st...>
抄送: gnu...@li...<mailto:gnu...@li...>
主?: 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...<mailto:qin...@st...> <qin...@st...<mailto: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...<mailto:qin...@st...>
****************************************************


_______________________________________________
gnuplot-info mailing list
gnu...@li...<mailto:gnu...@li...>
Membership management via: https://lists.sourceforge.net/lists/listinfo/gnuplot-info