The Archives

• 03.24.09
  gnuplot just for coordinates shell | pfortuny | (2)

  I needed a list of coordinates urgently, and I needed it in a text file (I am using LaTeX a lot lately). Gnuplot does the job properly, if told to do so: $ gnuplot gnuplot> set terminal table gnuplot> set output "hyperbola" gnuplot> set parametric gnuplot> plot [t=-1.5:1.5] cosh(t),sinh(t) gnuplot> quit $ cat hiberbola |awk '/[0-9]/{print "(",$1,",",$2,")"}' > hyperbola.txt The above saves in "hyperbola" a list of coordinates: each line contains a pair x y i (x coordinate, y coordinate, type of coordinate). The awk line turns it into a list of parenthesized coordinate pairs. The lines above saved me a lot of troubles yesterday.

  Tagged: awk, cat, gnuplot, LaTeX
  
• 12.12.08
  awk specifying the field separator cmd, scripts | pfortuny | (0)

  $ awk -F'=| ' '{print $3}' < code.pl Prints the third field in each line of regr_FF, using the regexp '=| ' as the field separator (FS). The example regexp means "either an equal sign or a space'.

  Tagged: awk, FS, regexp, unix