Dear Emre,
Check the "Supplements" website of the book at
http://www.info.ucl.ac.be/~pvr/ds/mitbook.html. The code for drawing the
tree is available there!
Cheers,
raph
On Sun, Oct 19, 2008 at 12:38 PM, Emre Sevinc <[EMAIL PROTECTED]> wrote:
> I'm reading "Concepts, Techniques, and Models of Computer
> Programming" and on page 160 I saw the code to draw a tree and I
> wanted to run it on my system I've added those two lines to the end of
> code given in the book:
>
> MyTree = tree(key:a val:111
> left:tree(key:b val:55
> left:tree(key:x val:100
> left:tree(key:z val:56 left:leaf
> right:leaf)
> right:tree(key:w val:23 left:leaf
> right:leaf))
> right:tree(key:y val:105 left:leaf
> right:tree(key:r val:77 left:leaf
> right:leaf)))
> right:tree(key:c val:123
> left:tree(key:d val:119
> left:tree(key:g val:44 left:leaf
> right:leaf)
> right:tree(key:h val:50
> left:tree(key:i val:5
> left:leaf right:leaf)
> right:tree(key:j val:6
> left:leaf right:leaf)))
> right:tree(key:e val:133 left:leaf right:leaf)))
>
> MyTree2 = {AddXY MyTree}
>
> {Browse {DepthFirst MyTree2 3 4 5}}
>
> When I fed the buffer I received the following message:
>
> %***************************** failure **************************
> %**
> %** Tell: 95 = 5
> %**
> %** Call Stack:
> %** procedure 'DepthFirst' in file "c:/Documents and
> Settings/Emre/Desktop/tree.oz", line 20, column 0, PC = 18888300
> %**--------------------------------------------------------------
>
>
> I'm a little bit confused now, I couldn't understand what I should do
> to get something similar to the screenshot given in the Figure 3.19 of
> the book.
>
> Maybe I'm using the DepthFirst procedure in the wrong way or maybe the
> parameters I have passed are wrong, or maybe it is because DepthFirst
> is a procedure not a function (but I simply couldn't understand where
> its output goes or what the output is, another tree, how it should be
> graphically drawn, etc.)
>
> What is the correct way of drawing the actual graphics for the tree?
>
>
>
> --
> Emre Sevinc
>
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>
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