[Maxima] how to use ploted to draw a line of "x=0"

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From: bear.tw at hotmail.com
To: maxima at math.utexas.edu
Subject: how to use ploted to draw a line of "x=0"
Date: Tue, 21 Apr 2009 13:05:41 +0800








Dear all

I use plot2d to draw "log(x),exp(x) relation  on x,y , x=y axis"
this is my command
f(x):=x;
plot2d([exp(x),-exp(x),log(x),-log(x),f(0),f(x)],[x,-5,5],[y,-5,5]);

that is my question
4. how to show the scale of x : y = 1:1(because the x scale is a littel long to y scale)

use [gnuplot_preamble,"set size ratio -1"] , that can be let the scale of x:y=1:1
f(x):=x;
plot2d([exp(x),-exp(x),log(x),-log(x),f(0),f(x)],[x,-5,5],[y,-5,5],[gnuplot_preamble,
"set  grid;set size ratio -1;set arrow 4 rto 5"]);




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