formula

I'm calculating linear regressions based on a data set. I do not know the regression model or number of parameters at compile-time. I'm storing the regression equation in a SQL Server 2005 database as the string y = 3x^2 + 2x // just an example When I need to make a prediction, I grab the equation from the database, substitue x with the value I'm predicting, and use NCalc to evaluate the resulting string. That method seems to work OK, but I'm wondering if there's a better way or a built-in feature of SQL Server that I've missed that would allow me to do these calculations on the database side

I'm trying to set the formula for a cell using a (dynamically created) sheet name and a fixed cell address. I'm using the following line but can't seem to get it working: "=" & strProjectName & "!" & Cells(2, 7).Address Any advice on why this isn't working or a prod in the right direction would be greatly appreciated. Thanks in advance Not sure what isn't working in your case, but the following code will put a formula into cell A1 that will retrieve the value in the cell G2. strProjectName = "Sheet1" Cells(1, 1).Formula = "=" & strProjectName & "!" & Cells(2, 7).Address The workbook and

I have drawn a rectangle. I know its (x1,y1) Top Left and (x2,y2) Bottom Right coordinates.. I also have the height h and width w of drawn rectangle.. How can I find the center coordinates (x,y) ? I am currently using the following formula. (x,y) = (x2 + x1)/2, (y2+y1)/2 It gives the correct y coordinate but no luck in x. Prasad G The center of rectangle is the mid point of the diagonal end points of rectangle. Here the midpoint is ( (x1 +x2)/2 ,(y1 + y2)/2 ). that means xCenter = (x1 +x2)/2 yCenter = (y1 + y2)/2 Let me know your code. Center x = x + 1/2 of width Center y = y + 1/2 of height

I am using @Formula("cast(item_code as \"int\")") to cast a String column to int but hibernate is generating the query as and cast(this_.item_code as this_."int")=? How do i get rid of the alias in front of int ? I tried : @Formula("cast(item_code as "int")") and @Formula("cast(item_code as int)") but still the same error . How do i cast the String to int ? Thanks in advance . I have resolved an issue similar to yours. I extended the hibernate Dialect class for my database. public class Oracle10gDialectExtended extends Oracle10gDialect { public Oracle10gDialectExtended() { super(); /* types

now I have one formula: int a = 53, x = 53, length = 62, result; result = (a + x) % length; but how to calculate reverse modulus to get the smallest "x" if I known result already (53 + x) % 62 = 44 //how to get x i mean what's the formula or logic to get x private int ReverseModulus(int div, int a, int remainder) { if(remainder >= div) throw new ArgumentException("Remainder cannot be greater than or equal to divisor"); if(a < remainder) return remainder - a; return div + remainder - a; } e.g. : // (53 + x) % 62 = 44 var res = ReverseModulus(62,53,44); // res = 53 // (2 + x) % 8 = 3 var res =

It is possible to use a shortcut for formula in lm() m <- matrix(rnorm(100), ncol=5) lm(m[,1] ~ m[,2:5] here it would be the same as lm(m[,1] ~ m[,2] + m[,3] + m[,4] + m[,5] but in the case when variables are not of the same level (at least this is my assumption for now) this does not work and I get the error: Error in model.frame.default(formula = hm[, 1] ~ hm[, 2:4], drop.unused.levels = TRUE) : invalid type (list) for variable 'hm[, 2:4]' Data (hm): N cor.distance switches time 1 50 0.04707842 2 0.003 2 100 -0.10769441 2 0.004 3 200 -0.01278359 2 0.004 4 300 0.04229509 5 0.008 5 500 -0

I am trying to write a prime number function in C# and I am wondering if the follow code will work. It "appears" to work with the first 50 numbers or so. I just want to make sure it will work no matter how big the number is: static bool IsPrime(int number) { if ((number == 2) || (number == 3) || (number == 5) || (number == 7) || (number == 9)) return true; if ((number % 2 != 0) && (number % 3 != 0) && (number % 5 != 0) && (number % 7 != 0) && (number % 9 != 0) && (number % 4 != 0) && (number % 6 != 0)) return true; return false; } No it won't work! Try 121 = 11 * 11 for example which obviously