matlab中作的图形在y轴的两侧，怎样将Y轴移动到中间。

function xyplot(x,y)

% xyplot Plot 2D axes through the origin

%   Example 1:

%   t = linspace(0,2*pi,500); 

%   y1 = 80*sin(t); 

%   y2 = 100*cos(t);

%   xyplot(t,[y1;y2])

%

%   Example 2:

%   x = -2*pi:pi/10:2*pi;

%   y = sin(x);

%   plot(x,y)

%   xyplot

% PLOT

if nargin>0

if nargin == 2

plot(x,y);

else

display('   Not 2D Data set !')

end

end

hold on;

% GET TICKS

X=get(gca,'Xtick');

Y=get(gca,'Ytick');

% GET LABELS

XL=get(gca,'XtickLabel');

YL=get(gca,'YtickLabel');

% GET OFFSETS

Xoff=diff(get(gca,'XLim'))./40;

Yoff=diff(get(gca,'YLim'))./40;

% DRAW AXIS LINEs

plot(get(gca,'XLim'),[0 0],'k');

plot([0 0],get(gca,'YLim'),'k');

% Plot new ticks

for i=1:length(X)

plot([X(i) X(i)],[0 Yoff],'-k');

end;

for i=1:length(Y)

plot([Xoff, 0],[Y(i) Y(i)],'-k');

end;

% ADD LABELS

text(X,zeros(size(X))-2.*Yoff,XL);

text(zeros(size(Y))-3.*Xoff,Y,YL);

box off;

% axis square;

axis off;

set(gcf,'color','w');

测试这个函数

x =-10:0.1:10;

xyplot(x,exp(-x));

同意楼上

问题意思不明确，语文水平待提高！