CODEWITHSUNDEEP
c#arrays
Paul Dame
Paul Dame

Reputation: 23

Round all elements in double array

I need help trying to figure out how to round all the elements in a double array to 4 decimal places. I think I need to use either an Array.ForEach statement or a foreach statement, but I can't seem to get the syntax correct.

The Array has numbers (x/y coordinates) like this:

"0;24;5.99753782108473;21.770136316906;8.32805512530786;19.3909999184418"

These come from Autocad and can be up to 15 decimals long. I only need a 1/16" accuracy for what I'm trying to do so I can round it to 4 decimals without hurting anything.

Currently I am rounding the value at the time I need it with Math.Round(d1,4) - d1 is the array name. However I think rounding the whole array at once would be "cleaner"

Upvotes: 2

Views: 4814

Answers (2)

MasterBettor
MasterBettor

Reputation: 109

 i think you can use foreach like this :
 double array_value
 foreach(Double arry in yourArray){
   array_value = Math.Round(arry,4);
 }

Upvotes: 0

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726669

If you need the accuracy of 1/16-th, multiply your number by 16, round, and divide back by 16. Since 16 is a power of 2, double will provide a precise representation of it.

To convert the whole array at once, use LINQ: first, select the new value for each item, then convert the result back to an array, like this:

d1 = d1.Select(d => Math.Round(d*16) / 16).ToArray();

You need to use System.Linq in order for this to compile.

Upvotes: 4

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