如何在MATLAB中把坐标轴(X Y轴)移到坐标原点

pulbieup

function new_fig_handle = shift_axis_to_origin( fig_handle )

% 本函数目的是把 matlab 做的图坐标轴移到图形的中间部分去(与数学的做图习惯一致)
% 2008.10.10 in pku
- P3 ?0 m7 y) y7 a%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
figure('Name','shift_axis_to_origin','NumberTitle','off')                         % Create a new figure
% 拷贝图形到一个新的窗口
( s/ S& n! g7 _; D; _1 Q! N. wnew_fig_handle = copyobj( fig_handle , gcf );

xL=xlim ;
yL=ylim ;

xt=get(gca,'xtick') ;
+ x. X, b) i$ T- v5 j7 Nyt=get(gca,'ytick') ;
- o1 e9 K3 u5 C- Rset(gca,'XTick',[],'XColor','w') ;
  [. [% r# g! H" ^# v/ nset(gca,'YTick',[],'YColor','w') ;

% 把 x 和 y 坐标轴的两个方向各延长 10% （为了视觉上好看）
extend_x = ( xL(2)-xL(1) ) * 0.1 ;
extend_y = ( yL(2)-yL(1) ) * 0.1 ;
$ z, z0 R" b) J( _6 w3 l  d/ B% MxxL = xL + [ -extend_x extend_x] ;
& n& c  h7 F2 F' CyyL = yL + [ -extend_y extend_y] ;
# [2 R4 g; ]2 C* L7 _1 P4 }: ]4 ]set(gca,'xlim', xxL) ;
% _; K, k4 B- z$ f8 Yset(gca,'ylim', yyL) ;

pos = get(gca,'Position') ;
box off;

x_shift = abs( yyL(1)/(yyL(2)-yyL(1)) ) ;
. X/ {. S5 [6 `# Qy_shift = abs( xxL(1)/(xxL(2)-xxL(1)) ) ;

temp_1 = axes( 'Position', pos + [ 0 , pos(4) * x_shift , 0 , - pos(4)* x_shift*0.99999 ] ) ;
xlim(xxL) ;
box off ;
set(temp_1,'XTick',xt,'Color','None','YTick',[]) ;
8 P3 P: ?: G3 J/ X# O8 B5 n& }0 Dset(temp_1,'YColor','w') ;

temp_2 = axes( 'Position', pos + [ pos(3) * y_shift , 0 , -pos(3)* y_shift*0.99999 , 0 ] ) ;
ylim(yyL) ;
box off ;
set(temp_2,'YTick',yt,'Color','None','XTick',[]) ;
3 k% w) v5 @& w( E# Iset(temp_2,'XColor','w') ;

Base_pos = get(new_fig_handle,'Position') ;
3 ?& c* H0 w3 O4 _: Oarrow_pos_in_x_dircetion = Base_pos(2) - Base_pos(4) * yyL(1)/(yyL(2)-yyL(1)) ;
arrow_pos_in_y_dircetion = Base_pos(1) - Base_pos(3) * xxL(1)/(xxL(2)-xxL(1)) ;

annotation('arrow',[Base_pos(1) , Base_pos(1)+Base_pos(3)] , [arrow_pos_in_x_dircetion , arrow_pos_in_x_dircetion ] , 'Color','k');
4 |! w( }4 d( P* c1 I5 zannotation('arrow',[arrow_pos_in_y_dircetion , arrow_pos_in_y_dircetion ] , [Base_pos(2) , Base_pos(2)+Base_pos(4)] , 'Color','k');
end

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下面是一个例子：

% 本程序目的是把 matlab 做的图坐标轴移到图形的中间部分去(与数学的做图习惯一致)
% 2008.10.08
%

clc;clear;close all;
t=linspace(-2,8,100);
a1=axes;
6 c0 ^/ X: `  s8 f+ b( e, |plot(t,cos(t));

% xt=get(gca,'xtick');
, A  X% ^* P6 y! y; u% set(gca,'XTick',[],'XColor','w');
% xL=xlim;
% p=get(gca,'Position');
% box off;
% a2=axes('Position',p+[0,p(4)/2,0,-p(4)/2]);
8 N, H! C  A" T# `- z% xlim(xL);box off;
% set(gca,'XTick',xt,'Color','None','YTick',[]);

new_fig_handle = shift_axis_to_origin( gca ) ;

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

此例子的实现效果如下两个图所示：

6 V: k( k. q) r+ T' J$ O6 e/ K
6 w# J! U& d9 s+ ]% x

9 z# s4 S% x$ ~) P' j& a

NNNei256

在MATLAB中把坐标轴(X Y轴)移到坐标原点