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A function where small changes in input always result in large changes in output

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I would like an algorithm for a function that takes n integers and returns one integer. For small changes in the input, the resulting integer should vary greatly. Even though I've taken a number of courses in math, I have not used that knowledge very much and now I need some help... An important property of this function should be that if it is used with coordinate pairs as input and the result is plotted (as a grayscale value for example) on an image, any repeating patterns should only be visible if the image is very big. I have experimented with various algorithms for pseudo-random numbers

Split number into sum components

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问题 Is there an efficient algorithm to split up a number into N subsections so that the sum of the numbers adds up to the original, with a base minimum? For example, if I want to split 50 into 7 subsections, and have a base minimum of 2, I could do 10,5,8,2,3,5,17 (as well as any other number of combinations). I'd like to keep the numbers as integers, and relatively random but I'm not sure how to efficiently generate numbers that sum up to the original and don't include numbers lower than the

eclipse java code display linenumber

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what plugins do i need to install on eclipse so that .java files will show line number? how about show line number on .xml/.html as well? There is also a simpler way: just right click on gutter (left border of your editor window in which your code resides) and enable them.. there is a specific option there. Window Menu -> Preferences -> General -> Editors -> Text Editors -> check Show line numbers Easy click on left bar (where line numbers will show) and clikc Show line numbers. http://prntscr.com/2znore What if line numbers are not displayed even after checking the line number option in

Given a stock of integers 0-9, what is the last number I can write before I run out of some integer?

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As the title says, given a stock of integers 0-9, what is the last number I can write before I run out of some integer? So if I'm given a stock of, say 10 for every number from 0 to 9, what is the last number I can write before I run out of some number. For example, with a stock of 2 I can write numbers 1 ... 10: 1 2 3 4 5 6 7 8 9 10 at this point my stock for ones is 0, and I cannot write 11. Also note that if I was given a stock of 3, I could still write only numbers 1 ... 10, because 11 would cost me 2 ones, which would leave my stock for ones at -1. What I have come up so far: public class

Numbers System in javascripts

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问题 Division by zero is not an error in JavaScript: it simply returns infinity or negative infinity. There is one exception, however: zero divided by zero does not have a well- defined value, and the result of this operation is the special not-a-number value, printed as NaN . NaN also arises if you attempt to divide infinity by infinity, or take the square in JavaScript root of a negative number or use arithmetic operators with non-numeric operands that cannot be converted to numbers. for Example

Random number bigger than 100,000

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I'm writing in C/C++ and I want to create a lot of random numbers which are bigger than 100,000. How I would do that? With rand(); // Initialize rand()'s sequence. A typical seed value is the return value of time() srand(someSeedValue); //... long range = 150000; // 100000 + range is the maximum value you allow long number = 100000 + (rand() * range) / RAND_MAX; You may need to use something larger than a long int for range and number if (100000 + range) will exceed its max value. You wouldn't do that with rand , but with a proper random number generator which comes with newer C++, see e.g.

adding zeros in front of a string

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I need your help. I'd like to create a function that would add some zeros in front of a number. The maximum numbers of digits that the total string should have is 6. Here are examples: 9 -> 000009 14 -> 000014 230 -> 000230 1459 -> 001459 21055 -> 021055 987632 -> 987632 (Do nothing, there's already 6 digits) A simple one line solution without any loops Works with IE5-11, Firefox, Chrome, etc. Assumes integer input. function pad(n) { return ("000000" + n).slice(-6); } Run snippet to test: <html> <body> <input id="stdin" placeholder="enter a number" maxlength="6"><button onclick="test()">Test<

Number of Records in Insert Statement (Oracle)

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I'd like to report on the number of records inserted in an Oracle insert statement. I'm inserting from a statement, so I could run my select twice and a count, but I'd rather keep it all in a single statement. Is there a way? Doing an INSERT in PL/SQL SQL%ROWCOUNT gives the number of inserted rows. Doing an INSERT in C# cmd.ExecuteNonQuery() returns the number of inserted rows. 来源： https://stackoverflow.com/questions/1468396/number-of-records-in-insert-statement-oracle

Sum consecutive numbers in a list. Python

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i'm trying to sum consecutive numbers in a list while keeping the first one the same. so in this case 5 would stay 5, 10 would be 10 + 5 (15), and 15 would be 15 + 10 + 5 (30) x = [5,10,15] y = [] for value in x: y.append(...) print y [5,15,30] y = [sum(x[:i+1]) for i in range(len(x))] You want itertools.accumulate() (added in Python 3.2). Nothing extra needed, already implemented for you. In earlier versions of Python where this doesn't exist, you can use the pure python implementation given: def accumulate(iterable, func=operator.add): 'Return running totals' # accumulate([1,2,3,4,5]) --> 1

Increment values/numbers in Sublime 3

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问题 I have multiple lines like this <VValue type="int" value="0" /> in files running in Sublime; each where the value increments 0, 1, 2, 3 etc... I need to change these values, +60 . So, 0 would become 60 , 1 would be 61 etc. How do I select the multiple lines and append them with regex in Sublime? I'm not sure of the command to select the number itself... something like \d+ was mentioned in another thread - Sublime Text 2 increment numbers Note, I skip one number to separate some content in the