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2-31 发表于 2006-5-12 16:19

为什么我的M文件执行不了?

function tree=j_tree(train_features,train_targets)%建树算法: =size(train_features); %得到非类别属性训练集的大小Ni*L Nbins=length(unique(train_features)); %得到训练集的属性值的长度 Uc=unique(train_targets); %得到类别属性目标集的值 U=length(unique(train_targets)); %得到目标集的属性值的长度 if (length(unique(train_targets))==1), %结束条件 tree.split_dim=0; tree.ClassName=train_targets(U); return end
 for i=1:U, Pnode(i)=length(find(train_targets==i))/Ni; 
end Inode=-sum(Pnode.*log(Pnode)/log(2)); 
 delta_Ib=zeros(1,L);
P=zeros(1,U); for i=1:L, for k=1:Nbins, indices=find(train_features(:,i)==k); V(k)=length(indices); Y(k)=length(indices)/Ni; %if (V(k)~=0), for j=1:U, 
 s=length(find(train_targets(indices)==j)); 
 P(j)=s/V(k); %P(s/v) end %end Q=sum(-P.*log(eps+P)/log(2)); E(k)=Y(k).*Q; end info=sum(E); delta_Ib(i)=Inode-info; %H(U)-H(U|V) end =max(delta_Ib); tree.split_dim=dim; dims=find(~ismember(1:L,dim)); 
for i=1:Nbins, indices=find( train_features(:,dim) ==i); 
 tree.child(i)=j_tree(train_features(indices,dims),train_targets(indices)); 
end 
这是我根据数据挖掘中的决策树ID3算法写的建树算法j_tree.m文件
从Import Data...给它Excel数据Sheet1(14*4),Sheet2(14*1)
在matlab命令窗口输入:
train_features=Sheet1;
train_targets=Sheet2;
j_tree(train_features,train_targets)
之后就出现了上面的提示
??? Subscripted assignment between dissimilar structures.



Error in ==> D:\matlab\work\j_tree.m
On line 57==>tree.child(i)=j_tree(train_features(indices,dims),train_targets(indices)); 
除去最后的一个for循环,直接在命令窗口输入M文件的内容,整个过程都进行计算了, 能得到delta_Ib,m,dim等的值,且与书上所给的例子的计算值完全相同
当根据提示 
??? Undefined function or variable 'Pnode'.
Error in ==> D:\matlab\work\j_tree.m
On line 21==>Inode=-sum(Pnode.*log(Pnode)/log(2)); %信息熵H(U)=-sum P(U)log2P(U)
添加一句Pnode=zeros(1,U);之后,又出现
??? Maximum recursion limit of 500 reached. Use set(0,'RecursionLimit',N) to change the limit.Be aware that exceeding your available stack space can crash MATLAB and/or your computer.
Error in ==> D:\matlab\work\j_tree.m
On line 6==>Uc=unique(train_targets); %得到类别属性目标集的值
我该怎么办啊?

happy 发表于 2006-5-13 16:28

回复：（2-31）为什么我的M文件执行不了?

...
当根据提示
??? Undefined function or variable 'Pnode'.
Error in ==> D:\matlab\work\j_tree.m
On line 21 ==> Inode=-sum(Pnode.*log(Pnode)/log(2)); %信息熵H(U)=-sum P(U)log2P(U)

红色标记的部分是在什么情况下出现的？最好把你前面的数据给一下方便调试

[ 本帖最后由 ChaChing 于 2009-5-23 12:37 编辑 ]

2-31 发表于 2006-5-14 10:55

在加上 %if (V(k)~=0), 之后出现 数据 Sheet1: 
<TABLE 216pt; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=288 border=0 x:str>
<COLGROUP>
<COL style="WIDTH: 54pt" span=4 width=72>

<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 54pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right width=72 height=19 x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 54pt; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right width=72 x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 54pt; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right width=72 x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 54pt; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right width=72 x:num>1</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>3</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>3</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>3</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>3</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>3</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>3</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>3</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>3</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>3</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>1</TD>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" align=right x:num>2</TD></TR></TABLE>Sheet2:
<TABLE 54pt; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=72 border=0 x:str>
<COLGROUP>
<COL style="WIDTH: 54pt" width=72>

<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 54pt; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right width=72 height=19 x:num>1</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>1</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>1</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>1</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>2</TD></TR>
<TR 14.25pt" height=19>
<TD #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; BORDER-BOTTOM: #ece9d8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" align=right height=19 x:num>1</TD></TR></TABLE>

2-31 发表于 2006-5-16 10:03

我这个程序到底是哪里出问题了???

要生成的可能是一棵多叉树,我想知道我的这个程序的递归用的对不对?

[ 本帖最后由 ChaChing 于 2009-5-23 12:42 编辑 ]

happy 发表于 2006-5-16 20:58

回复：（2-31）为什么我的M文件执行不了?

没出现你上述说的问题，只有一条警告 Warning: Divide by zero. (Type "warning off MATLAB:divideByZero" to suppress this warning.) In D:\MATLAB6p5\work\j_tree.m at line 34

2-31 发表于 2006-5-17 16:14

我把程序修改了一下,主要是在它的结束条件方面 function tree=m_tree(features,targets,Nbins)
=size(features); %得到非类别属性训练集的大小Ni*L Uc=unique(targets); %得到类别属性目标集的值1 2 3 类 U=length(unique(targets)); %得到目标集的属性值的长度3
%结束条件 if (length(unique(targets))==1),%类别相同 tree.split_dim=0; tree.child(a)=targets(U); %???想说明它是在哪个分枝出现,但不知道这个a如何给 return end
if (L == 1),%剩最后一列,结束 for a = 1:Nbins, tree.split_dim= 0; indices = find(features == a); if ~isempty(indices), if (length(unique(targets(indices))) == 1), tree.child(a) = targets(indices(1)); else H = hist(targets(indices), Uc); = max(H); tree.child(a) = Uc(T); end else tree.child(a) = inf; end end return end
%开始计算 for a=1:U, Pnode(a)=length(find(targets==a))/Ni; end Inode=-sum(Pnode.*log(Pnode)/log(2)); delta_Ib=zeros(1,L); P=zeros(1,U); for a=1:L, for k=1:Nbins, f=find(features(:,a)==k); V(k)=length(f); Y(k)=V(k)/Ni; if (V(k)~=0), for b=1:U, s=length(find(targets(f)==b)); P(b)=s/V(k); %P(s/v) end end Q=sum(-P.*log(eps+P)/log(2)); E(k)=Y(k).*Q; end info=sum(E); delta_Ib(a)=Inode-info; %H(U)-H(U|V) end =max(delta_Ib); tree.split_dim=dim; dims=find(~ismember(1:L,dim)); %剩余属性 for a=1:Nbins, indices=find(features(:,dim) ==a); %把在Ak处取值相同的例子归于同一子集，取几个值就得几个子集 if (~isempty(indices)), tree.child(a)=m_tree(features(indices,dims),targets(indices),Nbins); %对既含正例又含反例的子集，递归调用建树算法 end end
 执行结果: split_dim=1 tree: 中间都没有计算,递归也没实现 用的这个例子的计算最终应该是这种形式: split_dim:1 / | \ split_dim:2 1 split_dim: / \ / \ 1 2 1 2 可能还是结束条件有问题吧,怎么样才能实现递归?

2-31 发表于 2006-5-18 18:15

为什么这个程序只做到 split_dim=1 tree: 就不再往下执行了?怎么才能实现递归?

happy 发表于 2006-5-18 20:26

回复：（2-31）为什么这个程序只做到 split_dim=1 ...

<DIV class=quote>以下是引用2-31在2006-5-18 18:15:00的发言： 
为什么这个程序只做到 split_dim=1 tree: 就不再往下执行了?怎么才能实现递归?</DIV>
 看一下判断条件是否有问题

tkroy 发表于 2009-5-21 00:54

回复楼主 2-31 的帖子

我最近也在用这个程序作东西，遇到了同样的问题，应该是因为你的树结构中中间结点包含structure 数组 child，但是叶子节点中没有child。因此当某些中间结点的子节点既有叶子又有中间结点时，递归时tree.child(a)=m_tree（...）的操作出错，因为它为数组tree.child的元素所附的值结构不同。

我采用的解决方法笨一点，直接在前面所有的终止条件语段中出了给split_dim赋值外，再加一句tree.child=[]；就好了

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为什么我的M文件执行不了?

回复：（2-31）为什么我的M文件执行不了?

回复：（2-31）为什么我的M文件执行不了?

回复：（2-31）为什么这个程序只做到 split_dim=1 ...

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