Need to find difference between numbers in array and save to new array - novice

Question

I am frankly a novice to Java. I have a project that i am working on where I want to find a way to create a polynomial function based on a sequence of numbers.

Anyway, my question is that i have created an array that has stored a sequence. I would like to now find the difference between the elements. So for example. i want to find this calculation a[2] - a[1] and then store accordingly into another array.

What i have already done is this. I am not too confident about this but mostly am having a problem storing each into another array. I am sure this is a bit of a stupid question however, I would appreciate any help possible.

for(int i = 0;i<=sequence.length;i++){
    double diff = sequence[i+1]- sequence[i];
}

jamp · Accepted Answer · 2015-04-16 15:48:31Z

4

Assuming sequence is an array of doubles, try this:

double[] diffs = new double[sequence.length - 1];
for (int i = 0; i < sequence.length - 1; i++) {
    diffs[i] = sequence[i + 1] - sequence[i];
}

edited Apr 16, 2015 at 15:48

answered Apr 16, 2015 at 15:41

jamp

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3 Comments

Code Whisperer Over a year ago

@Ray It will work. Length = 10, i = 8 will be the last to be used.

Maktoom Ahmad Over a year ago

Oh. this is awesome. I can't believe i didn't think of this. thankyou so much guys . You are fantastic. Thankyou very much, Just got me out of a jam,

Maktoom Ahmad Over a year ago

yeah. i don't really know how to. but as soon as i find out. i definitely will.

Code Whisperer · Accepted Answer · 2015-04-16 15:43:27Z

2

arr = new int[sequence.length - 1];
// length will be smaller by 1 than the original sequence

for(int i = 0; i < sequence.length - 1; i++){
   arr[i] = sequence[i+1]- sequence[i]; // no point making it double 
   //if both elements are ints, they won't have decimals to use in calculation.
}

answered Apr 16, 2015 at 15:43

Code Whisperer

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