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.NET Forum / Languages / C# / March 2008Convert a int[] to a double[]
Hello, I am passing a int[] to a function that only takes a double[] private double[] GraphData; public Form3(int[] OurData) { GraphData = OurData; foreach (int x in GraphData) { System.Convert.ToDouble(x); } InitializeComponent(); } private void Form3_Load(object sender, EventArgs e) { CreateGraph(zedGraphControl1,GraphData); } .................. double[] y = GraphData; It gives me errors. How can I pass an int Array to a form constructor and then convert it to a double Array? Thanks Mike > Hello, > I am passing a int[] to a function that only takes a double[] [quoted text clipped - 26 lines] > Thanks > Mike Try the following private double[] GraphData; public Form3(int[] OurData) { GraphData = new double[ourData.Length]; int idx=0; foreach (int x in GraphData) { GraphData[idx++] = System.Convert.ToDouble(x); } InitializeComponent(); } private void Form3_Load(object sender, EventArgs e) { CreateGraph(zedGraphControl1,GraphData); } > > Hello, > > I am passing a int[] to a function that only takes a double[] [quoted text clipped - 47 lines] > > - Show quoted text - Sorry correction; public Form3(int[] OurData) { GraphData = new double[ourData.Length]; int idx=0; foreach (int x in OurData) { GraphData[idx++] = System.Convert.ToDouble(x); } InitializeComponent(); } int[] integerArray = new int[] { 1, 2, 3 }; List<double> doubleList = new List<double>(); foreach (int i in integerArray) doubleList.Add((double)i); double[] doubleArray = doubleList.ToArray(); or using Linq int[] integerArray = new int[] { 1, 2, 3 }; double[] doubleArray = (from currentValue in integerArray select (double)currentValue).ToArray(); Peter, >int[] integerArray = new int[] { 1, 2, 3 }; >List<double> doubleList = new List<double>(); [quoted text clipped - 8 lines] >double[] doubleArray = > (from currentValue in integerArray select (double)currentValue).ToArray(); Wouldn't double [] doubleArray = integerArray.Cast<double>().ToArray(); do too? Regards, Gilles. > Wouldn't > > double [] doubleArray = integerArray.Cast<double>().ToArray(); > > do too? I believe it would right now, but it shouldn't, and it won't with .NET 3.5 SP1. http://blogs.msdn.com/ed_maurer/archive/2008/02/16/breaking-change-in- linq-queries-using-explicitly-typed-range-variables.aspx  SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk > I believe it would right now, but it shouldn't, and it won't with .NET > 3.5 SP1. > > http://blogs.msdn.com/ed_maurer/archive/2008/02/16/breaking-change-in- > linq-queries-using-explicitly-typed-range-variables.aspx Ah. I was wondering about that. :) I was actually surprised when I wrote my little test code to see if Cast<T> worked to find that it did. Before the test, I'd assumed it would literally just try to cast to the target type. I was pleasantly surprised that it did more than that. Of course, that happiness was short-lived. Thanks for pulling the rug out. :) Pete >> Wouldn't >> [quoted text clipped - 7 lines] >http://blogs.msdn.com/ed_maurer/archive/2008/02/16/breaking-change-in- >linq-queries-using-explicitly-typed-range-variables.aspx Good to know Jon, thanks for the pointer. Regards, Gilles. > int[] integerArray = new int[] { 1, 2, 3 }; > List<double> doubleList = new List<double>(); > foreach (int i in integerArray) > doubleList.Add((double)i); > > double[] doubleArray = doubleList.ToArray(); I think I'd pre-allocate the List<T> in this case: List<double> doubleList = new List<double>(integerArray.Length); > or using Linq > > int[] integerArray = new int[] { 1, 2, 3 }; > double[] doubleArray = > (from currentValue in integerArray select > (double)currentValue).ToArray(); That works. Or this too: double[] doubleArray = integerArray.Cast<double>().ToArray(); Pete On Mar 25, 3:12 pm, "Peter Duniho" <NpOeStPe...@nnowslpianmk.com> wrote: > On Tue, 25 Mar 2008 12:53:41 -0700, Peter Morris <peter[dot]morris > [quoted text clipped - 22 lines] > > Pete I really like what linq brings to C#3.0. > I really like what linq brings to C#3.0. Me too. Though, ironically, I have found that for my own purposes, because I am so rarely writing any code that uses a database, I'm never using the database-oriented aspects of LINQ. Even though my first exposure to it was in situations specifically referencing database manipulation, and even though the power of LINQ appears to be most directly applicable in that context, and even though the examples I continue to be exposed to are most often in that context, it turns out it's very useful for other more mundane things as well. :) But yes, it's a very nice addition, as is the extension methods feature that makes much of what's in LINQ possible (especially the stuff I'm using :) ). Pete Currently I mainly use linq to populate ViewData in a website without giving access to the objects themselves..... ViewData["OrderLines"] = from line in order.Lines select new { LineNumber = line.LineNumber, ProductName = line.Product.Name, QuantityOrdered = line.QuantityOrdered, etc = line.etc }; :-) Pete <snip> > That works. Or this too: > > double[] doubleArray = integerArray.Cast<double>().ToArray(); As I replied to Gilles (just repeating myself as this could be a dangerously seductive answer otherwise) - that works now, but will probably break with .NET 3.5 SP1. http://blogs.msdn.com/ed_maurer/archive/2008/02/16/breaking-change-in- linq-queries-using-explicitly-typed-range-variables.aspx SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk > I am passing a int[] to a function that only takes a double[] You can convert an int array into a double array like this: GraphData = Array.ConvertAll(OurData, delegate(int x) { return (double)x; } ); Or in C# 3: GraphData = Array.ConvertAll(OurData, x => (double)x); SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk Free MagazinesGet these publications absolutely FREE for up to 12 months. 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