how to convert back to array

Question

hi...i finish my intersection now. I need to convert the output back to the array. I also need to arrange them in
the original form.
Before the intersection:
1 2
1 2 3
1 2 3 4
1 3
1 3 4
....

Now my output is like this:
2
1
2
1
3
2
1
3
4
1
3
1
3
4

i need to restore output in array and make them become like this:
my expected output that i want:
2 1
2 1 3
2 1 3 4
1 3
1 3 4
..
here is my coding:

for (int i = 0; i < myArray1.Count; i++)

{

foreach (string t in myArray1[i].ToString().Split(' '))

{

//ItemKey.AppendText(t);

hs3.Add(t);

}

var clone = new HashSet<string>(hs2);

hs2.IntersectWith(hs3);

foreach (string y in hs2)

{

ItemKey.AppendText(y);

}

hs2 = clone;

hs3.Clear();

}

What should i need to do...to make my output become like this...hope someone can help me.thanks ya...

Sin Yee · Answer

Thanks for helping....can run already....really sorry that i disturb you so much time.

Sin Yee · Answer

so this will start after the intersection?? i need to store my hs2 in the list and using this code to do the arrangement?

Vulpes · Answer

Anything you do before creating 'strarray' is irrelevant to the present exercise apart from what's finally in myArray1 and hs2 because that's now the starting point. I've revised my code to start with exactly what you said you saw when you iterated through hs2 and myArray1 (the thread's got so long that I think I must have used some earlier stuff before): using System; using System.Collections.Generic; using System.Windows.Forms; using System.Linq; class Test { static void Main() { List myArray1 = new List (); myArray1.Add("1 2"); myArray1.Add("1 2 3"); myArray1.Add("1 2 3 4"); myArray1.Add("1 2 4"); myArray1.Add("1 3"); myArray1.Add("1 3 4"); myArray1.Add("1 4"); myArray1.Add("2 3"); myArray1.Add("2 3 4"); myArray1.Add("2 4"); myArray1.Add("2 5"); myArray1.Add("3 4"); List hs2 = new List (); hs2.Add("2"); hs2.Add("1"); hs2.Add("2"); hs2.Add("1"); hs2.Add("3"); hs2.Add("2"); hs2.Add("1"); hs2.Add("3"); hs2.Add("4"); hs2.Add("2"); hs2.Add("1"); hs2.Add("4"); hs2.Add("1"); hs2.Add("3"); hs2.Add("1"); hs2.Add("3"); hs2.Add("4"); hs2.Add("1"); hs2.Add("4"); hs2.Add("2"); hs2.Add("3"); hs2.Add("2"); hs2.Add("3"); hs2.Add("4"); hs2.Add("2"); hs2.Add("4"); hs2.Add("2"); hs2.Add("5"); hs2.Add("3"); hs2.Add("4"); string[] strarry = hs2.ToArray(); string[] myArray2 = new string[myArray1.Count]; int[] lens = new int[myArray1.Count]; int index = 0; foreach (string y in myArray1) { lens[index] = y.Replace(" ", "").Length; index++; } index = 0; int index2 =0; string[] temp = new string[lens[0]]; foreach (string q in strarry) { if (index2 { temp[index2] = q; index2++; } else { myArray2[index] = String.Join(" ", temp); index++; temp = new string[lens[index]]; temp[0] = q; index2 = 1; } } myArray2[index] = String.Join(" ", temp); string message = String.Join("
", myArray2); MessageBox.Show(message); } } The output is now : 2 1 2 1 3 2 1 3 4 2 1 4 1 3 1 3 4 1 4 2 3 2 3 4 2 4 2 5 3 4 which is exactly what you said you were expecting.

Sin Yee · Answer

I had tried your code. But the result still the same as the previous one

Sin Yee · Answer

//single key and item HashSet hs1 = new HashSet (); var g = from k in sItem.Keys orderby sItem[k] descending select k; foreach (var k in g) { //display3 += k + ":" + sItem[k] + "
"; SingleSupport.AppendText(k + ":" + sItem[k] + "
"); hs1.Add(k); } //key and values for comabination ArrayList myArray1 = new ArrayList(); string text = ""; IDictionaryEnumerator et = itemS.GetEnumerator(); while (et.MoveNext()) { KeyitemS.AppendText(et.Key.ToString() + ":" + et.Value.ToString() + "
"); myArray1.Add(et.Key.ToString()); } HashSet hs2 = new HashSet (hs1); HashSet hs3 = new HashSet (); for (int i = 0; i { foreach (string t in myArray1[i].ToString().Split(' ')) { hs3.Add(t); } var clone = new HashSet (hs2); hs2.IntersectWith(hs3); string[] myArray2 = new string[myArray1.Count]; hs2 = clone; hs3.Clear(); this is the code that i used to do my intersection the hs1 is store the single item key and value that already sorted from highest to lowest based on the values. 2:8 1:7 3:7 4:7 5:1 the myArray1 is store the key of combination 1 2 1 2 3 1 2 3 4 1 2 4 1 3 1 3 4 1 4 2 3 2 3 4 2 4 2 5 3 4 i need to do the intersection with these two. hs3 is store the item from myArray1 after split. hs2 is store the hs1. after each of the intersection it will reset and intersect with the hs3. hs3 will be cleared after each intersection to store the new next line item. After that i need to convert back to array and display the output like this 2 1 2 1 3 2 1 3 4 2 1 4 1 3 1 3 4 1 4 2 3 2 3 4 2 4 2 5 3 4 ... this is the output that i want....

Vulpes · Answer

Yes, I do. But, anyway, I've extracted both the data and the code into a console app so we can see exactly what's going on. I've had to use a List for hs2, to avoid the duplicates being lost, but otherwise the code is essentially the same as before: using System; using System.Collections.Generic; using System.Windows.Forms; using System.Linq; class Test { static void Main() { List myArray1 = new List (); myArray1.Add("1 2"); myArray1.Add("1 2 3"); myArray1.Add("1 2 3 4"); myArray1.Add("1 3"); myArray1.Add("1 3 4"); myArray1.Add("1 4"); // guess myArray1.Add("2 3"); // guess myArray1.Add("2 3 4"); // guess myArray1.Add("3 4"); // guess List hs2 = new List (); hs2.Add("2"); hs2.Add("1"); hs2.Add("2"); hs2.Add("1"); hs2.Add("3"); hs2.Add("2"); hs2.Add("1"); hs2.Add("3"); hs2.Add("4"); hs2.Add("2"); hs2.Add("1"); hs2.Add("4"); hs2.Add("2"); hs2.Add("3"); hs2.Add("2"); hs2.Add("3"); hs2.Add("4"); hs2.Add("2"); hs2.Add("4"); hs2.Add("2"); hs2.Add("5"); hs2.Add("3"); hs2.Add("4"); string[] strarry = hs2.ToArray(); string[] myArray2 = new string[myArray1.Count]; int[] lens = new int[myArray1.Count]; int index = 0; foreach (string y in myArray1) { lens[index] = y.Replace(" ", "").Length; index++; } index = 0; int index2 =0; string[] temp = new string[lens[0]]; foreach (string q in strarry) { if (index2 { temp[index2] = q; index2++; } else { myArray2[index] = String.Join(" ", temp); index++; temp = new string[lens[index]]; temp[0] = q; index2 = 1; } } myArray2[index] = String.Join(" ", temp); string message = String.Join("
", myArray2); MessageBox.Show(message); } } The output is: 2 1 2 1 3 2 1 3 4 2 1 4 2 3 2 3 4 2 4 2 5 3 4 which looks OK to me.

Sin Yee · Answer

You mean put after the intersection statement..?

Sin Yee · Answer

string text = ""; foreach (string q in hs2) { text += q.Length.ToString() + "
"; } MessageBox.Show(text); output: 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 string text = ""; foreach (string q in myArray1) { text += q + "
"; } MessageBox.Show(text); output: 12 times loops for 1 2 1 2 3 1 2 3 4 1 2 4 1 3 1 3 4 1 4 2 3 2 3 4 2 4 2 5 3 4

Vulpes · Answer

Well, as that's full of duplicates, then there are three possibilities:- 1. hs2 is not a HashSet but something else which has an IntersectWith method. 2. The items in the HashSet contain variable amounts of whitespace after the digit. 3. I'm going completely mad! I'm tending at the moment towards option #3 but then I can't understand why the code using strarray isn't working. Can you change the previous code snippet slightly to this and tell me again what you see: string text = ""; foreach (string q in hs2) { text += q.Length.ToString() + "
"; } MessageBox.Show(text); And then finally, do this one as well, so we're absolutely sure what we've got: string text = ""; foreach (string q in myArray1) { text += q + "
"; } MessageBox.Show(text);

Sin Yee · Answer

the output is 2 1 2 1 3 2 1 3 4 2 1 4 1 3 1 3 4 1 4 2 3 2 3 4 2 4 2 5 3 4

Vulpes · Answer

We seem to be going around in circles here. OK, tell me exactly what you see when you run this piece of code immediately after the intersection: string text = ""; foreach (string q in hs2) { text += q + "
"; } MessageBox.Show(text);

Sin Yee · Answer

i need to convert the output of intersection to array and display like the previous one after intersect with the hs3....

Sin Yee · Answer

'2121321342141313423234242534' this is the output after the intersection(hs2.IntersectWith(hs3)).I need to use these output to display like the previous style.

Vulpes · Answer

That won't help at all because strarry contains the same elements as hs2. What I need to know is where is '2121321342141313423234242534' stored? You said in your last but two post that it was stored in a string array but what's the name of the array because I can't see it in your code?

Sin Yee · Answer

if i change the 'strarry ' to hs2..? for (int i = 0; i { foreach (string t in myArray1[i].ToString().Split(' ')) { hs3.Add(t); } var clone = new HashSet (hs2); hs2.IntersectWith(hs3); string[] myArray2 = new string[myArray1.Count]; int[] lens = new int[myArray1.Count]; int index = 0; foreach (string y in myArray1) { lens[index] = y.Replace(" ", "").Length; index++; } index = 0; int index2 = 0; string[] temp = new string[lens[0]]; foreach (string q in hs2) { if (index2 { temp[index2] = q.ToString(); index2++; } else { myArray2[index] = String.Join(" ", temp); index++; temp = new string[lens[index]]; temp[0] = q.ToString(); index2 = 1; } } myArray2[index] = String.Join(" ", temp); ItemKey.AppendText(String.Join("
", myArray2)); hs2 = clone; hs3.Clear(); }

Vulpes · Answer

As I said in my previous post, the problem is that 'strarry' doesn't contain your output (which contains duplicates) because it's derived from a hashset (which can't contain duplicates). So, where is your code which stores and, presumably prints out, your output? If I could see that, then I should be able to figure out what changes are needed to make this work.

Sin Yee · Answer

here is the code....pls help me see ..where i got wrong... String[] strarry; for (int i = 0; i { foreach (string t in myArray1[i].ToString().Split(' ')) { hs3.Add(t); } var clone = new HashSet (hs2); hs2.IntersectWith(hs3); strarry = hs2.ToArray(); string[] myArray2 = new string[myArray1.Count]; int[] lens = new int[myArray1.Count]; int index = 0; foreach (string y in myArray1) { lens[index] = y.Replace(" ", "").Length; index++; } index = 0; int index2 =0; string[] temp = new string[lens[0]]; foreach (string q in strarry) { if (index2 { temp[index2] = q; index2++; } else { myArray2[index] = String.Join(" ", temp); index++; temp = new string[lens[index]]; temp[0] = q; index2 = 1; } } myArray2[index] = String.Join(" ", temp); ItemKey.AppendText(String.Join("
", myArray2)); hs2 = clone; hs3.Clear(); }

Sin Yee · Answer

yaya...now can display already but the output seem very weird... is like this: 2 1 2 1 3 2 1 3 4 ....and so on... the output that i hold before i do this arrangement is 2121321342141313423234242534 (in string array) not in vertical 2 1 2 1 3 2 1 3 4 2 1 4 2 3 2 3 4 2 4 2 5 3 4 How to solve this problem..Sorry that i trouble you...But i am newbie for c#.So hope you can help me.

Vulpes · Answer

It's such a muddle that it's difficult to know where to start but I can see right away that you've missed out the highlighted line: foreach (string y in myArray1) { lens[index] = y.Replace(" ", "").Length; index++; } Also there's no way that strarray can contain your 'output' values bearing in mind that they contain duplicates. That's because you've derived strarray from the hashset, hs2, which can't possibly contain any duplicates as they're removed automatically as elements are added.

Sin Yee · Answer

temp[0] = q.ToString(); this line give the error....what should i do..???

Sin Yee · Answer

temp[0] = q.ToString(); this line give the error....

Sin Yee · Answer

pls help me see see my code...

Sin Yee · Answer

i still dont understand where i got wrong....?? here is the code... String [] Array = new string[myArray1.Count]; String[] strarry; for (int i = 0; i { foreach (string t in myArray1[i].ToString().Split(' ')) { //ItemKey.AppendText(t); hs3.Add(t); } var clone = new HashSet (hs2); hs2.IntersectWith(hs3); // intersection strarry = hs2.ToArray(); //store back to array string[] myArray2 = new string[myArray1.Count]; int[] lens = new int[myArray1.Count]; int index = 0; foreach (string y in myArray1) { lens[index] = y.Replace(" ", "").Length; } index = 0; int index2 = 0; string[] temp = new string[lens[0]]; foreach (string q in strarry) { if (index2 { temp[index2] = q.ToString(); index2++; } else { myArray2[index] = String.Join(" ", temp); index++; temp = new string[lens[index]]; temp[0] = q.ToString(); index2 = 1; } } myArray2[index] = String.Join(" ", temp); ItemKey.AppendText(String.Join("
", myArray2)); hs2 = clone; hs3.Clear(); }

Vulpes · Answer

strings, string arrays or string lists know nothing about whether they're displayed horizontally or vertically. If the output is stored in a string array rather than a simple string, then my first attempt should work as there's no difference between iterating through an array or a list when using foreach. As long as there were 14 digits in the original list before the intersection and there are 14 elements in the output string array, then the length shouldn't be a problem. What the code is doing is working out the length of each string in the original list and storing it in the 'lens' array. It then counts off the appropriate number of digits from the output array, separates them with spaces and then inserts the result in myArray2.

Sin Yee · Answer

is it the length problem....??

Sin Yee · Answer

still the same error...is it because now my output is in horizontal form and store in string array not in vertical form???

Vulpes · Answer

If the output is in the form of a string rather than a list, then change the second foreach() statement to the following: foreach(char y in output) { if (index2 { temp[index2] = y.ToString(); index2++; } else { myArray2[index] = String.Join(" ", temp); index++; temp = new string[lens[index]]; temp[0] = y.ToString(); index2 = 1; } }

Sin Yee · Answer

got error...it just can print out first one output then will give the error said"index was outside bound of array"...

Sin Yee · Answer

sorry for wrong post my output that i hold now is like this: 21213213413134

Sin Yee · Answer

sorry for wrong post my output that i hold now is like this: 21213213413134

Vulpes · Answer

Well, it's not clear to me from that code where the original form is stored or where the output is stored. Assuming that the former is stored in a list called 'original' and the latter in a list called 'output', then this code should convert 'output' into an array in the original form and display it in a MessageBox: string[] myArray2 = new string[original.Count]; int[] lens = new int[original.Count]; int index = 0; foreach(string y in original) { lens[index] = y.Replace(" ", "").Length; index++; } index = 0; int index2 = 0; string[] temp = new string[lens[0]]; foreach(string y in output) { if (index2 { temp[index2] = y; index2++; } else { myArray2[index] = String.Join(" ", temp); index++; temp = new string[lens[index]]; temp[0] = y; index2 = 1; } } myArray2[index] = String.Join(" ", temp); // do last one MessageBox.Show(String.Join("
", myArray2));