[Haskell-cafe] Producing MinimumValue

[Alexteslin]

The question suggests to use some functions defined in the section, and one
of them is iSort.
So i used the function but without using higher-order functions - i don't
know though how correct is it?

minimumValue :: [Int] -> Int
minimumValue ns = head (iSort ns)

The other question is to test whether the values of allEqual on inputs 0 to
n are all equal.  Again, I defined the method but not sure if its concise?

allEqual :: [Int] -> Bool
allEqual xs = length xs == length (filter isEqual xs)
	where
	isEqual n = (head xs) == n


Excuse me for questions like these, probably they are not interested ones
but I am just trying to learn the thinking behind the function definitions. 

Thank you



Joachim Breitner-2 wrote:
> 
> Hi,
> 
> Am Mittwoch, den 18.07.2007, 13:42 -0700 schrieb Alexteslin:
>> I am trying to define a function as part of the exercises that gives a
>> result of a minimum value of the input list of ints. Such as this:
>> 
>> minimumValue :: [Int] -> Int
>> minimumValue ns ...
>> 
>> using either filter or map functions but Not foldr1, because the exercise
>> precedes the section on foldr1.
>> I am confused because using filter - it generates a list on some
>> constraint
>> function for each element.  
>> 
>> Any hints will be very appreciated.  Thank you  
> 
> Are you allowed to define the function without any of filter or map,
> just yourself?
> 
> minimumValue [a] = ...
> minimumValue (x:xs) = .. x .. minimumValue xs ..
> 
> Greetings,
> Joachim
> 
> -- 
> Joachim Breitner
>   e-Mail: mail at joachim-breitner.de
>   Homepage: http://www.joachim-breitner.de
>   ICQ#: 74513189
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> 

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