Databases
StackOverflow2013
Postsdbo
POPassing an IEnumerable of Numeric Values as a parameter to method
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POPassing an IEnumerable of Numeric Values as a parameter to method
    primarykey
    data
    text
    <p>I'm playing around with a very simple program to take an array of doubles and return the standard deviation. This part worked but I wanted to make the code more reusable. I would like to make it so the method can accept a parameter of any type that could be considered numeric and return the standard deviation instead of hardcoding a double type (like I initially did in this program). How does one go about this and what is the proper term for it?</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication5 { class Program { static void Main(string[] args) { double[] avg = { 3.4, 55.6, 10.0, 4.5, 2, 2 }; double x = avg.Average(); //first round of testing Console.WriteLine("The average of the first array is below "); Console.WriteLine(x); Console.WriteLine("below should be the standard deviation!"); Console.WriteLine(CalculateStandardDeviation(avg)); Console.ReadLine(); int[] intAvg = { 4, 3, 5, 6, 2 }; double secondAvg = intAvg.Average(); Console.WriteLine("The average of the second array is below "); Console.WriteLine(secondAvg); //this is where the error is happening //CalculateStandardDeviation(secondAvg); } //this is where I tried to make the query more reusable public static double CalculateStandardDeviation(IEnumerable&lt;double&gt; values) { double avg = values.Average(); double sum = 0; foreach (double d in values) { sum += Math.Pow((d - avg), 2); } return Math.Pow(sum / (values.Count() - 1),.5); } } } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USDaveShaw
    1. USwootscootinboogie
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POPassing an IEnumerable of Numeric Values as a parameter to method
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POPassing an IEnumerable of Numeric Values as a parameter to method
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POPassing an IEnumerable of Numeric Values as a parameter to method
      1. This table or related slice is empty.
      1. VTUpMod
    1. COYou could create a method for each type you would consider a valid "input" and let overloading handle it - all the other types then might just cast to `double` and call the version that takes `IEnumerable<double>`. You might be able to do it with generics (see [this](http://stackoverflow.com/questions/3329576/generic-constraint-to-match-numeric-types) for example), but there's really no good way to generically constrain to only numeric types.
      singulars
      1. POPassing an IEnumerable of Numeric Values as a parameter to method
      1. USmellamokb
    2. COI think the fundamental issue is your method is requesting _double_ type, but you're feeding it a collection of _int_. You would need to convert it or create an overload that takes integers and converts it to a `double` set instead.
      singulars
      1. POPassing an IEnumerable of Numeric Values as a parameter to method
      1. USChris Sinclair
    3. COI would like for the CalculateStandardDeviation method to be able to accept a parameter of any numeric type. The program works if I change the IEnumerable type to double, or int..but not both. I'd like to be able to use a float, int, double, money, whatever else type of array and have the method work instead of hardcoding the return type.
      singulars
      1. POPassing an IEnumerable of Numeric Values as a parameter to method
      1. USwootscootinboogie
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload