add pffft

pffft/plots.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+OUTPNG="1"
+W="1024"
+H="768"
+PTS="20"
+LWS="20"
+
+for f in $(ls -1 *-4-*.csv *-6-*.csv); do
+  b=$(basename "$f" ".csv")
+  #echo $b
+  LASTCOL="$(head -n 1 $f |sed 's/,/,\n/g' |grep -c ',')"
+  echo "${b}: last column is $LASTCOL"
+  if [ $(echo "$b" |grep -c -- "-1-") -gt 0 ]; then
+    YL="duration in ms; less is better"
+  elif [ $(echo "$b" |grep -c -- "-4-") -gt 0 ]; then
+    YL="duration relative to pffft; less is better"
+  else
+    YL=""
+  fi
+
+  E=""
+  if [ "${OUTPNG}" = "1" ]; then
+    E="set terminal png size $W,$H"
+    E="${E} ; set output '${b}.png'"
+  fi
+  if [ -z "${E}" ]; then
+    E="set key outside"
+  else
+    E="${E} ; set key outside"
+  fi
+  E="${E} ; set datafile separator ','"
+  E="${E} ; set title '${b}'"
+  E="${E} ; set xlabel 'fft order: fft size N = 2\\^order'"
+  if [ ! -z "${YL}" ]; then
+    #echo "  setting  Y label to ${YL}"
+    E="${E} ; set ylabel '${YL}'"
+  fi
+  # unfortunately no effect for 
+  #for LNO in $(seq 1 ${LASTCOL}) ; do
+  #  E="${E} ; set style line ${LNO} ps ${PTS} lw ${LWS}"
+  #done
+  E="${E} ; plot for [col=3:${LASTCOL}] '${f}' using 2:col with lines title columnhead"
+
+  if [ "${OUTPNG}" = "1" ]; then
+    gnuplot -e "${E}"
+  else
+    gnuplot -e "${E}" --persist
+  fi
+done