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
2 d+ {) U/ r, d7 s% I7 r- e%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1 w: i0 L8 u! j) \! }figure('Name','shift_axis_to_origin','NumberTitle','off')                         % Create a new figure
% 拷贝图形到一个新的窗口
new_fig_handle = copyobj( fig_handle , gcf );

xL=xlim ;
yL=ylim ;

xt=get(gca,'xtick') ;
yt=get(gca,'ytick') ;
4 f2 `2 ~/ g2 w) tset(gca,'XTick',[],'XColor','w') ;
9 M5 ?6 y# v( G8 D% mset(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 ;
/ S4 q+ L+ W; t* q- }  R+ |extend_y = ( yL(2)-yL(1) ) * 0.1 ;
5 E6 z: t4 N6 YxxL = xL + [ -extend_x extend_x] ;
- B1 {* a* O; f0 LyyL = yL + [ -extend_y extend_y] ;
$ [! v- p2 k  V3 E' l3 [0 n; Vset(gca,'xlim', xxL) ;
set(gca,'ylim', yyL) ;

pos = get(gca,'Position') ;
5 d0 m: i& V4 U, \! `box off;

x_shift = abs( yyL(1)/(yyL(2)-yyL(1)) ) ;
y_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) ;
2 M- v$ [/ j6 O+ lbox off ;
set(temp_1,'XTick',xt,'Color','None','YTick',[]) ;
9 U: T, z1 u! P9 Y5 s* D  {set(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 ;
" ?, p, N! N  z0 }: g3 S+ [set(temp_2,'YTick',yt,'Color','None','XTick',[]) ;
set(temp_2,'XColor','w') ;

Base_pos = get(new_fig_handle,'Position') ;
arrow_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');
6 v! x+ A3 c# ~9 Hannotation('arrow',[arrow_pos_in_y_dircetion , arrow_pos_in_y_dircetion ] , [Base_pos(2) , Base_pos(2)+Base_pos(4)] , 'Color','k');
end

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

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);
4 p7 r3 D4 ~  z4 y- N! `a1=axes;
plot(t,cos(t));

% xt=get(gca,'xtick');
) q2 o" B4 d7 G5 n% ?6 o% set(gca,'XTick',[],'XColor','w');
% xL=xlim;
8 E, v# _" D( d" n/ x4 R% p=get(gca,'Position');
2 k5 }* O/ V; b3 U. ^7 z1 s" Y% box off;
% a2=axes('Position',p+[0,p(4)/2,0,-p(4)/2]);
% xlim(xL);box off;
7 ]% J  x5 @7 U  n% 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：

1 m) ]  p; @/ w( C( X: D/ L

% k) {3 n* Y0 G9 Y7 j
8 a; P$ A9 k) P/ o7 ?
" }) n3 h, G$ L) {* [" Y

NNNei256

在MATLAB中把坐标轴(X Y轴)移到坐标原点