Loop structure inside gnuplot

Question

Is there any way to iteratively retrieve data from multiple files and plot them on the same graph in gnuplot  Suppose I have files like data1 txt  data2 txt      data1000 txt  each having the same number of columns  Now I could write something like-  plot  data1 txt  using 1 2 title  Flow 1           data2 txt  using 1 2 title  Flow 2                                   data1000 txt   using 1 2 title  Flow 6    But this would be really inconvenient  I was wondering whether there is a way to loop through the plot part in gnuplot

User · Answer

I have the script all p  set         list system  ls -1B   dat   plot for  file in list  file w l u 1 2 t file   Here the two last rows are literal  not heuristic  Then i run     gnuplot -p all p   Change   dat to the file type you have  or add file types    Next step  Add to    bashrc this line  alias p  gnuplot -p     all p    and put your file all p int your home directory and voila  You can plot all files in any directory by typing p and enter    EDIT I changed the command  because it didn t work  Previously it contained list i  word system ls -1B   dat  i

User · Answer

There sure is  in gnuplot 4 4     plot for  i 1 1000   data  i   txt  using 1 2 title  Flow   i   The variable i can be interpreted as a variable or a string  so you could do something like  plot for  i 1 1000   data  i   txt  using 1   2 i  title  Flow   i   if you want to have lines offset from each other   Type help iteration at the gnuplot command line for more info   Also be sure to see  DarioP s answer about the do for syntax  that gives you something closer to a traditional for loop

User · Answer

Use the following if you have discrete columns to plot in a graph  do for  indx in  2 3 7 8       column   indx   0   plot ifile using 1 column

User · Answer

I wanted to use wildcards to plot multiple files often placed in different directories  while working from any directory  The solution i found was to create the following function in    bashrc   plo      local arg  w l  local str  set term wxt size 900 500 title  wild plotting  set format y   g  set logs plot  while      -gt 0           do str   str   1   arg           shift done echo   str    gnuplot -persist     and use it e g  like plo   dat       dir2   out  to plot all  dat files in the current directory and all  out files in a directory that happens to be a level up and is called dir2

User · Answer

Here is the alternative command   gnuplot -p -e  plot for  file in system  find   -name     txt -depth 1    file using 1 2 title file with lines

User · Answer

Take a look also to the do         command since gnuplot 4 6 as it is very powerful   do for  t 0 50      outfile   sprintf  animation bessel 03 0f png  t    set output outfile   splot u sin v  u cos v  bessel u t 50 0  w pm3d ls 1     http   www gnuplotting org gnuplot-4-6-do

[gnuplot] Loop structure inside gnuplot?

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