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 S# i& ]; a- k1 W" F$ Y%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
figure('Name','shift_axis_to_origin','NumberTitle','off')                         % Create a new figure
4 ~8 V+ ^: i  _  V* \9 N, R6 s% 拷贝图形到一个新的窗口
: k" q8 }1 O7 @1 c/ }- r' Gnew_fig_handle = copyobj( fig_handle , gcf );

xL=xlim ;
yL=ylim ;

xt=get(gca,'xtick') ;
yt=get(gca,'ytick') ;
9 Y& D! p, I" m, d; R; @& Aset(gca,'XTick',[],'XColor','w') ;
set(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）
, k. w2 z; U, Q% O9 t4 S( ]3 Qextend_x = ( xL(2)-xL(1) ) * 0.1 ;
# X$ f1 ?( N: }& a! H+ Kextend_y = ( yL(2)-yL(1) ) * 0.1 ;
0 _& g5 X$ q9 b& U7 |xxL = xL + [ -extend_x extend_x] ;
yyL = yL + [ -extend_y extend_y] ;
) ~5 E# x, P* s6 Bset(gca,'xlim', xxL) ;
set(gca,'ylim', yyL) ;

pos = get(gca,'Position') ;
* X# N" G3 c; [" K! i! W, A/ Y+ A; T3 \box off;

x_shift = abs( yyL(1)/(yyL(2)-yyL(1)) ) ;
! E6 f& O1 P# U  S) S  Ay_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) ;
6 s! L% t5 X5 o8 }box off ;
9 L# `( L5 n8 W& j9 t0 v  _% lset(temp_1,'XTick',xt,'Color','None','YTick',[]) ;
set(temp_1,'YColor','w') ;

temp_2 = axes( 'Position', pos + [ pos(3) * y_shift , 0 , -pos(3)* y_shift*0.99999 , 0 ] ) ;
, e( X+ n6 z/ fylim(yyL) ;
box off ;
6 y  Q* J* w  f' G/ dset(temp_2,'YTick',yt,'Color','None','XTick',[]) ;
set(temp_2,'XColor','w') ;

Base_pos = get(new_fig_handle,'Position') ;
' L" f: B4 p% h) k' n# Sarrow_pos_in_x_dircetion = Base_pos(2) - Base_pos(4) * yyL(1)/(yyL(2)-yyL(1)) ;
0 r# W- r. W, Barrow_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');
annotation('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);
2 `/ \* Y& W0 B8 N% \- I$ t0 ma1=axes;
5 J# p2 ~% o& e3 ?* @plot(t,cos(t));

% xt=get(gca,'xtick');
% set(gca,'XTick',[],'XColor','w');
% xL=xlim;
% p=get(gca,'Position');
% box off;
3 s- ]( ?: N  H& i! m% a2=axes('Position',p+[0,p(4)/2,0,-p(4)/2]);
% xlim(xL);box off;
. _: L+ l0 b" G6 ~7 ^% set(gca,'XTick',xt,'Color','None','YTick',[]);

new_fig_handle = shift_axis_to_origin( gca ) ;

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此例子的实现效果如下两个图所示：

" p* D; T- i* K

0 r4 o& o) ]# s& g, k0 L

NNNei256

在MATLAB中把坐标轴(X Y轴)移到坐标原点