在GDB里plot数据

数据的可视化对于调试来说是很重要的，特别是做信号处理的。

原理是这样的：

gdb里的output可以把数据导出，然后把导出的数据存成文件

然后转成可以用gnuplot输出的文件格式即可

下面有一个名为plot1d.gdb文件

可以把这个文件的内容直接拷贝到.gdbinit文件里

或者在gdb里surce plot1d.gdb即可

在调试的时候，直接plot1d  变量就可以了

参考链接地址：

https://sourceware.org/gdb/wiki/PlottingFromGDB

file:plot1d.gdb

# plot1d.gdb
#
# Copyright (C) 2008 Florian Lorenzen
#
# Plot an expression that expands to {x1, x2, ..., xN}, i. e.
# N numbers using gnuplot.
#
# This file is for the GNU debugger 6.x.
#
# It writes temporary files named __plot1d.dump, __plot1d.dat, __plot1d.gp, so
# you should not have files of the same name in the working directory.
#
# It requires sed, awk, and gnuplot available in the $PATH.


# plot1d_opt_range <expr> <opt> <range>
#
# Plot the points of <expr> passing <opt> as plot options using
# <range> in the set yrange command.
define plot1d_opt_range
  shell rm -f __plot1d.dump __plot1d.dat __plot1d.gp
  set logging file __plot1d.dump
  set logging on
  output $arg0
  set logging off
  shell awk '{printf("%s", $0)}' < __plot1d.dump | \
    sed 's/^{\(.*\)}$/\1/;s/, */\n/g' > __plot1d.dat
  shell echo "set yrange $arg2; plot '__plot1d.dat' $arg1 title '$arg0'; \
    pause -1 \"Press enter to continue\"" > __plot1d.gp
  shell gnuplot __plot1d.gp
  shell rm -f __plot1d.dump __plot1d.dat __plot1d.gp
end


# plot1d <expr>
#
# Just plot the points of <expr>.
define plot1d
  plot1d_opt_range $arg0 "" "[*:*]"
end


# plot1d_opt <expr> <opt>
#
# Plot the points of <expr> passing <opt> to the
# plot command after the datafile. So, one can pass
# "with lines" here.
define plot1d_opt
  plot1d_opt_range $arg0 $arg1 "[*:*]"
end