The Archives

  • 24.Mar.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.
  • 12.Dec.08
    awk specifying the field separator cmd, scripts | pfortuny | (1)
    $ awk -F'=| ' '{print $3}' < 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'.