help

Fri, 30 Aug 2002 22:12:16 +1000

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Dear sir/madum
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I am a Haskell beginner; I got the problem in use Haskell because I never touch it before. Can you help me to solve the following two exercises please?
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<H1 style="MARGIN: 0cm 0cm 0pt">Exercise 1<o:p></o:p></H1>
How to write a filter that removes all HTML tags from a HTML document, it should have the main function as following:
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Main :: IO( )
Main = interact noTags
Where noTags :: String -&gt;String is the function you will write to remove all text delimited by &lt; and &gt; from a String
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<H1 style="MARGIN: 0cm 0cm 0pt">Exercise 2 <o:p></o:p></H1>
If there are three matrix 
Matrix a = &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3 
4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 6 
7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9 
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Matrix b =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; -1 
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1 
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Matrix c = &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; -1 
&nbsp;1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbsp; -1
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&lt;+&gt; Return the sum of two matrices 
&lt;-&gt;&nbsp; Return the different of two matrices 
&lt;*&gt; Return the product of two matrixes. 
*&gt; Return the product of a scalar and a matrix 
Implement a module that can evaluate the expression&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3.0 *&gt; a &lt;+&gt; b &lt;+&gt; c 
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Would you please give some hint to me?
Thank you very much.
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Your sincerely:
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YAN ZHONG
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