Find highest value in List

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Find highest value in List

 
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  #1
Oct 1st, 2008
I am using a List where I wonder how it is possible to find the MaxValue searching trough
Value1[0] until Value1[3].
In this case it should return: 12
I have found a ::Max function but this will only consider the 2 values inside the paranthes wich then will return: 100.
For the std:: you can use std::max_element( , ) for this purpose to search through a range of elements.

C++ Syntax (Toggle Plain Text) 
  1. List<double>^ Value1= gcnew List<double>();
  2. Value1->Add(12);
  3. Value1->Add(2);
  4. Value1->Add(7);
  5. Value1->Add(4);
  6.  
  7. double MaxValue1 = 0;
  8.  
  9. MaxValue1 = System::Math::Max( 0, 100 );
Last edited by Jennifer84; Oct 1st, 2008 at 11:02 am.
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Re: Find highest value in List

 
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  #2
Oct 1st, 2008
Well You can use the sort function to list and get the max value .

For that you will need to write a bool comp() function for your datatype.

Comparison function that, taking two values of the same type than those contained in the list object, returns true if the first argument goes before the second argument in the specific order (i.e., if the first is less than the second), and false otherwise.

After sorting. The item in your list will be the greatest i guess.
Last edited by Sky Diploma; Oct 1st, 2008 at 11:07 am.
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Re: Find highest value in List

 
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  #3
Oct 1st, 2008
I understand. I have a wondering here. If you would use a for loop to iterate through a series of elements to replace a greater value to find the greatest value.
Will this be as fast as the sortingmethod or perheps this is difficult to say ?
Why I wonder is because I am not 100 % sure how to write that comparison before I begin.
Last edited by Jennifer84; Oct 1st, 2008 at 11:14 am.
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Re: Find highest value in List

 
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  #4
Oct 1st, 2008
Well I dint see it before. But seems that you have a list of doubles in the list.

So you can just use

C++ Syntax (Toggle Plain Text) 
  1. Value1.sort();

And then print out the last item in the list.
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Re: Find highest value in List

 
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Oct 1st, 2008
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Originally Posted by Sky Diploma
Well You can use the sort function to list and get the max value .

For that you will need to write a bool comp() function for your datatype.

Comparison function that, taking two values of the same type than those contained in the list object, returns true if the first argument goes before the second argument in the specific order (i.e., if the first is less than the second), and false otherwise.

After sorting. The item in your list will be the greatest i guess.
Erm, what's wrong with a simple loop?
C++ Syntax (Toggle Plain Text) 
  1. double max = Value1[0];
  2.  
  3. for each ( double value in Value1 ) {
  4.   if ( value > max )
  5.     max = value;
  6. }
>Will this be as fast as the sortingmethod or perheps this is difficult to say ?
I'd be surprised if the sorting method was faster.
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Re: Find highest value in List

 
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  #6
Oct 1st, 2008
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Originally Posted by Narue View Post
Erm, what's wrong with a simple loop?
C++ Syntax (Toggle Plain Text) 
  1. double max = Value1[0];
  2.  
  3. for each ( double value in Value1 ) {
  4.   if ( value > max )
  5.     max = value;
  6. }
>Will this be as fast as the sortingmethod or perheps this is difficult to say ?
I'd be surprised if the sorting method was faster.

Well I dint see that . The List was containing Double's I thought that it is some datatype . I stand corrected though. I guess i already have replied too.
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Re: Find highest value in List

 
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  #7
Oct 1st, 2008
I think I will go with the loop then, I found out it was very fast also.
I did iterate a ListValue 200000000 times and it only took about 1 second.

/j
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