My Math Forum Fit number to a range

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 October 14th, 2011, 01:55 AM #1 Newbie   Joined: Oct 2011 Posts: 3 Thanks: 0 Fit number to a range Hello First, I don't know if im posting in the right forum... So please move the post if its not in the right place. Im very week in math So here is the problem im facing: I have conceptual ranges with even difference of 1000 (1-1000, 1001-2000, 2001-3000... and so on to infinity). Now, lets say there is an algorithm that randomly generates numbers. When number generated I want to know to what range it belongs, for example: if random generated number is: 11155 I want to know that its fit to range where lower limit is 11001 and higher limit is 12000 Thanks in advanced!
 October 14th, 2011, 02:07 AM #2 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 520 Math Focus: Calculus/ODEs Re: Fit number to a range One way might be to use the floor function. Let n denote the random natural number. Let $R=1000\lfloor\frac{n}{1000}\rfloor$ Then put the random natural number n in its range with: If R = n then $R-999$ to $R$ else $R+1$ to $R+1000$ end if
 October 14th, 2011, 03:08 AM #3 Newbie   Joined: Oct 2011 Posts: 3 Thanks: 0 Re: Fit number to a range Thanks for a quick reply! I do not understand this expression: $R=1000\lfloor\frac{n}{1000}\rfloor$ Can you write it as code (c#, c++) or something please? As i said, very week with math Thanks!
 October 14th, 2011, 03:12 AM #4 Senior Member     Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 520 Math Focus: Calculus/ODEs Re: Fit number to a range It's been quite a while since I coded in C, but there may be a floor(x) function in your math library. If so, write: R = 1000*floor(n/1000) edit: any function that truncates the digits to the right of the decimal point will work. Maybe there's an int(x) function (returns the value of the real number x as an integer whose magnitude (or absolute value: abs(x)) is rounded down to the greatest integer (returned by int(x)) less than or equal to abs(x), then this int(x) has the original sign of x restored. Now, I'm sure the library function does it much more efficiently, that is essentially what needs to be returned by the definition of the int(x) function. I would look at your compiler docs to find specific information about the int(x) and floor(x) functions. Just find one that essentially cuts off, or truncates to the right of the decimal point of a real number representation.
 October 14th, 2011, 05:51 AM #5 Newbie   Joined: Oct 2011 Posts: 3 Thanks: 0 Re: Fit number to a range Thanks! That works perfect!

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