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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

Int answer; String equation = Console.ReadLine(); Console.writeLine("your equation is {0}", equation); How do I convert the string into a solvable equation? Take a look at NCalc - Mathematical Expressions Evaluator for .NET It'll let you do this sort of thing: var inputString = "2 + 3 * 5"; Expression e = new Expression(inputString); var result = e.Evaluate(); eval.js: package BLUEPIXY { class Math { static public function Evaluate(exp : String) : double { return eval(exp); } } } compile to eval.dll >jsc /t:library eval.js calc.cs: using System; using System.Text.RegularExpressions; class Calc

I'm writing a program in which an equation is inputted as a string, then evaluated. So far, I've come up with this: test_24_string = str(input("Enter your answer: ")) test_24 = eval(test_24_string) I need both a string version of this equation and an evaluated version. However, eval is a very dangerous function. Using int() doesn't work, though, because it's an equation. Is there a Python function that will evaluate a mathematical expression from a string, as if inputting a number? One way would be to use numexpr . It's mostly a module for optimizing (and multithreading) numpy operations but

I want to develop a GUI application which displays a given mathematical equation. When you click upon a particular variable in the equation to signify that it is the unknown variable ie., to be calculated, the equation transforms itself to evaluate the required unknown variable. For example: a = (b+c*d)/e Let us suppose that I click upon "d" to signify that it is the unknown variable. Then the equation should be re-structured to: d = (a*e - b)/c As of now, I just want to know how I can go about rearranging the given equation based on user input. One suggestion I got from my brother was to use

How can I render Math equations on the web? I am already familiar with LaTeX's Math mode. It turns out this is a bit of a pain. You can use MathML , but browser support is still iffy. If you are starting with latex you've got a few options for converting to html, but they'll all typically end up rendering the actual equations to images and inlining those. Nothings all that pretty (unless you resort to pdf or something). What's best will depend a bit on what sort of content, how many equations, and how complicated the equations are. Here is a decent summary. Colonel Panic The other answers are