bash:将保存的变量加载到gnuplot cmd加载 [英] bash: loading presaved variable to gnuplot cmd load

问题描述

我的意图是在循环中加载变量i-我想使其在此循环中可用.当前状态是gnuplot从第一个回显中将var i作为字符串而不是var加载.

My intention is to have loaded variable i in for cycle - I want to have it usable for this cycle. Current state is that gnuplot loads var i from the first echo as a string not var.

SPEED=5

echo "plot '< head -n \"\$((SPEED*i))\" `echo ${INFILE}`' using 1:3 ;">> file.plt

for ((i=1;i<="$FRAMES";i++))                                     
do      
    echo  " 
        load '`echo ${file.plt}`';  
        " | gnuplot
done

推荐答案

我认为您可以直接在gnuplot中完成所有这些操作...

I think you can probably do all of this in gnuplot directly...

if(! exists("N")) N=0
FRAMES=10
FILE='myfile.plt'
SPEED=5
f(i)=sprintf("< head -n %d ".FILE,i+SPEED)
plot f(N) using 1:3
if(N < FRAMES) N=N+1
if(N < FRAMES) reread

---

Gnuplot 4.6使这变得更加容易:

---

Gnuplot 4.6 makes this even easier:

do for [N=1:10]{
   FILE='myfile.plt'
   SPEED=5
   f(i)=sprintf("< head -n %d ".FILE,i+SPEED)
   plot f(N) using 1:3

}

，而不是使用head，您可能可以使用every数据文件修饰符(有关详细信息，请参见help every).我认为是这样的:

and instead of using head, you can probably use the every datafile modifier (help every for details). I think something like the following:

NPT=N+SPEED
plot FILE every ::::NPT using 1:3

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