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Sum Array (Read 1147 times)
Andy
Sum Array
Apr 16th, 2006, 12:25pm  
Hi,
I'm relatively new to processing (about 3 months) and am experiencing difficulties 'summing' the values stored in an array. A very basic question I'm sure but I'm struggling none the less. Does anyone have any suggestions?
Many thanks

Andy
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Thanks&&Andy
 
mark hill
Re: Sum Array
Reply #1 - Apr 16th, 2006, 1:54pm  
For a previously declared array, try:

Code:


int sum = 0;

for (int i=0; i<array.length; i++) {
 sum += array[i];
 }

println ("sum of array values = " + sum);
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Andy
Re: Sum Array
Reply #2 - Apr 16th, 2006, 2:18pm  
Hi again,
thanks for the quick reply. I have already tried the 'for' loop idea, which certainly works, but (probably due to my code layout) continuously adds to the array total.

For example:

int[] points = new int[3];
points[0] = 1;
points[1] = 0;
points[2] = 0;

Obvously the sum of this array is 1, but with my setup the calculation adds 1 with every frame.

I have set up a void() to calculate the sum of the array, and then call upon the void() within the draw command.  Any ideas why the array keeps on adding '1' each time and hence does not give me the sum?

Many thanks
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Thanks&&Andy
 
mark hill
Re: Sum Array
Reply #3 - Apr 16th, 2006, 6:48pm  
Have you got more code, just to see what's happening in context?
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chandler
Re: Sum Array
Reply #4 - Apr 16th, 2006, 8:31pm  
are you resetting the sum variable to 0 before the loop? if not you will keep adding the next calculation to the last.
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