matlab运行SIFT算法总是出现未定义函数变量？

ubeautqq

未定义函数或变量 "pt11"。

出错 features_matching (line 14)
3 E6 Y2 T) v. q# r* C[B1,IX] = sort(pt11(:,1));

出错 tuxiangpingjie (line 34)
$ S6 h/ |7 i2 Z1 @: ][pt1,pt2]= features_matching( db, desc2, dist_ratio , pos1 , pos2);

features_matching 程序
function [pt1,pt2] = features_matching( database, desc, dist_ratio , pos1 , pos2 )
num = 1;
4 [; D& ~+ c' @% a1 @! G) l/ rfor k = 1:size(desc,1)
dist = sqrt(sum((database.desc - repmat(desc(k,,size(database.desc,1),1)).^2,2));
1 g* L5 F; V9 X8 _* O[B,IX] = sort(dist);
4 A4 K& ?# Q: |3 b6 @$ i+ qif B(1)/B(2) >= dist_ratio %nn2_dist >= dist_ratio
idx = 0;
else
5 E1 k6 Z) x  I( U$ e: npt22(num, = pos2(k,;
pt11(num,:) = pos1(IX(1),:);
num = num + 1;
end
end
" H$ v/ @* w* h6 b6 Q[B1,IX] = sort(pt11(:,1));
Pt1 = pt11(IX,:);
) X4 U$ l+ O7 TPt2 = pt22(IX,:);

2 Y; O! m& u" t9 |( [/ w! B3 T+ mk = 1;
- X$ G7 D- h" f& x8 Pfor i = 2:num-1
Dist = sqrt((Pt1(i,1) - Pt1(i-1,1))^2 +(Pt1(i,2) - Pt1(i-1,2))^2);
if Dist > 3
! t! y' ]! m# w, N! t% q5 y6 }pt1(k,:) = Pt1(i,:);
pt2(k,:) = Pt2(i,:);
  |, j5 {% T- T% i% p) _k = k + 1;
end
  @1 M/ K: X9 f: P$ bend

[B1,IX] = sort(pt2(:,1));
  t# a9 G4 |, c# [0 sPt1 = pt1(IX,:);
$ d$ r9 z2 @1 l, o  [( ~8 uPt2 = pt2(IX,:);

1 f0 N+ C" {: @kk = 1;
pt1 = [];
pt2 = [];
0 ^' j% r, a7 ~5 S. }for i = 2:k-1
: g# j9 |2 C1 q7 WDist = sqrt((Pt2(i,1) - Pt2(i-1,1))^2 +(Pt2(i,2) - Pt2(i-1,2))^2);
if Dist > 3
8 B6 V; v: U, J8 ?+ s- V8 a; u1 f5 Jpt1(kk,:) = Pt1(i,:);
: A! L" e7 A9 x0 ?# z8 v4 Rpt2(kk,:) = Pt2(i,:);
kk = kk + 1;
) s8 V  i* W) k: J; z( {  aend
& J, F" X* M3 o5 Hend

2 o$ v; m9 y- t, {* U& K' h6 ~8 a

) l, Y: ]. T# o4 o

littlestupid

好复杂