% P=intp(X1,Y1,X2,Y2)
% æ±ä¸¤ç»ç¦»æ£ç¹åºåç交ç¹
% X1,Y1为第ä¸ç»ç横纵åæ ï¼X2,Y2为第äºç»æ¨ªçºµåæ ï¼æ¨ªåæ å¿
须为æåºæ°åã
% è¿åå¼P为交ç¹åæ ï¼ä¸¤åç©éµï¼ç¬¬ä¸å为横åæ ï¼ç¬¬äºå为纵åæ ã
function P=intp(X1,Y1,X2,Y2)
X1=X1(:);
% å为ååé
X2=X2(:);
Y1=Y1(:);
Y2=Y2(:);
if max(X1)<min(X2) || max(X2)<min(X1)
P=[];
% 两个åºé´æ²¡æéå ï¼ä¸å¯è½æ交ç¹
return;
end
a=max(min(X1),min(X2));
b=min(max(X1),max(X2));
a1=find(X1>=a); a1=a1(1);
a2=find(X2>=a); a2=a2(1);
b1=find(X1<=b); b1=b1(end);
b2=find(X2<=b); b2=b2(end);
x=unique([X1(a1:b1); X2(a2:b2)]);
y1=interp1(X1,Y1,x,'linear');
y2=interp1(X2,Y2,x,'linear');
% æ¾åºå
Œ
±é¨å
d=y1-y2;
ind0=find(d==0);
% 差为0çæ¯äº¤ç¹ã
P1=[x(ind0), y1(ind0)];
d1=sign(d);
% æ±ç¬¦å·ï¼è´æ°ä¸º-1ï¼æ£æ°ä¸º1, 0为0
d2=abs(diff(d1));
ind1=find(d2==2);
% ç¸é»ç¬¦å·ç¸å·®2çï¼äº¤ç¹å¨æ¤åºé´å
P2=zeros(length(ind1),2);
for k=1:length(ind1)
i1=ind1(k);
i2=ind1(k)+1;
x1=x(i1);
x2=x(i2);
ya1=y1(i1);
ya2=y1(i2);
yb1=y2(i1);
yb2=y2(i2);
% 两æ¡çº¿æ®µå个端ç¹åæ
A=[ ya1-ya2, -(x1-x2)
yb1-yb2, -(x1-x2)]; % äºå
ä¸æ¬¡æ¹ç¨ç»ç³»æ°ç©éµ
B=[ (ya1-ya2)*x1-(x1-x2)*ya1
(yb1-yb2)*x1-(x1-x2)*yb1];
% 常æ°é¡¹ç©éµ
P2(k,:)=(A\\B)';
% 解æ¹ç¨ç»ï¼å¾å°äº¤ç¹åæ
end
P=[P1;P2];
% 两ç§æ
åµç交ç¹å并
P=sortrows(P,1);
% æ横åæ æåº
% å½æ°å°æ¤ç»æï¼ä¿åå°intp.mæ件ä¸
% ä¸é¢æ¯æ¥ä½ ç主ç¨åºæ¥ç,å°±æ¯æ·»å¨ä½ ç»å¾é£æ®µç¨åºåé¢
XA=AAAA;
YA=normpdf(AAAA,AA,AAA);
XB=BBBB;
YB=normpdf(BBBB,BB,BBB);
XC=CCCC;
YC=normpdf(CCCC,CC,CCC);
P1=intp(XA,YA,XB,YB);
% A,B交ç¹ï¼è°ç¨ä¸é¢ä¿åçé£ä¸ªintpå½æ°
P2=intp(XB,YB,XC,YC);
% B,C交ç¹
P3=intp(XC,YC,XA,YA);
% C,A交ç¹
P=[P1;P2;P3];
% plot(XA,YA,XB,YB,XC,YC)
hold on
plot(P(:,1),P(:,2),'ro')
hold off
str=cell(size(P,1),1);
for k=1:size(P,1)
str{k}=sprintf(' (%2.2g,%2.2g)',P(k,1),P(k,2));
end
text(P(:,1),P(:,2),str)
% 主ç¨åºå°æ¤ç»æ
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