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Fashoomp

Tue Feb 26, 2008 6:08 pm


Array Addition

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I have an array thats 1..30, and all 30 contain numbers
I want another array to store the results of addition within the array.

I want addition_array (i) := num_array (i) + num_array (i+1)
Problem is for the final value, (i+1) is out of range.


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syntax_error

Tue Feb 26, 2008 6:11 pm


RE:Array Addition

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trace though your program :L

you will see that the reason why you get out of range is you are looking for the 31st index; doesnt exist.

I do that that is your problem.


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Tony

Tue Feb 26, 2008 6:11 pm


RE:Array Addition

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well if your range is up to 30 and you want i + 1 to be the final value, what should i go up to? that is:

i + 1 = 30
i = ?


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OneOffDriveByPoster

Tue Feb 26, 2008 6:12 pm


Re: Array Addition

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So... your addition_array has one less entry, or you assume that the missing value is 0, or that the source array is circular, etc.


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Fashoomp

Tue Feb 26, 2008 6:15 pm


Re: Array Addition

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That doesn't help, since my code is (i+1) - (i)

I need to subtract value 2 from 1, then 3 from 2, then 4 from 3, etc.

The array of 30 was just an example. My array size is actually the length of a word I have entered.


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Tony

Tue Feb 26, 2008 6:17 pm


RE:Array Addition

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it doesn't make a difference. Just make sure that

max_i + 1 == length_of_word


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Fashoomp

Tue Feb 26, 2008 6:18 pm


Re: Array Addition

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Yes, the missing value in the addition array is a 0.


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syntax_error

Tue Feb 26, 2008 6:19 pm


Re: Array Addition

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Yes, the missing value in the addition array is a 0.


care to clarify?


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Fashoomp

Tue Feb 26, 2008 6:20 pm


Re: RE:Array Addition

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it doesn't make a difference. Just make sure that

max_i + 1 == length_of_word

But thats impossible. The fact that its i+1 means that it will always exceed the value of the for loop (sorry if I never mentioned thats what I'm using)


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Tony

Tue Feb 26, 2008 6:23 pm


RE:Array Addition

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hmm... really?

let word = "think"
then length_of_word := length(word)
length_of_word == 5

let max_i = length_of_word - 1
max_i == 4

max_i + 1 == length_of_word
4 + 1 == 5

QED


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Fashoomp

Tue Feb 26, 2008 6:23 pm


Re: Array Addition

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Sorry for double post

Would a conditional loop be better for adding my values to the array? Since I can just tell the loop to exit at word_length - 1, so my variable + 1 is my last array value?

That sounds right so I'm gonna go with that.


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syntax_error

Tue Feb 26, 2008 6:24 pm


RE:Array Addition

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glad you can think it out. Try that again next time.


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Nick

Tue Feb 26, 2008 6:43 pm


RE:Array Addition

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for i:2..length of word
word(i)+word(i-1)
end for
 

or


for i 1..length of word + 1
word(i) + word (i+1) %this will produce an error though
end for