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Um your welcome. 
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Hi,
I want to calculate this formula upon radian, not degree. (because I want to use it in an Area formula)
teta - sin(teta)
that : teta = 2*ArcCos(d)
I'd wrote this but it's wrong:
(2 * (Math.Acos(d) * 180 / Math.PI)) - Math.Sin((2 * (Math.Acos(d) * 180 / Math.PI)) * Math.PI / 180)
what's the correct?
Best wishes
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Isn't 180/PI how you convert to degrees ? Either way, you just do whatever conversions you need to get it to where you want it.
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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As said above, you can convert from degrees to radians by multiplying by PI/180. To go from radians to degrees, you multiply by 180/PI.
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What is the easiest way to compare two array lists?
I´m making a spelling test.
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Depends on what kind of data is inside the ArrayList, can you give us more information?
modified 12-Sep-18 21:01pm.
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strings.
al.Add("str1");
al.Add("str2");
al.Add("str3");
al.Add("str4");
al.Add("str5");
al2.Add(richTextBox1.Text);
al2.Add(richTextBox1.Text);
al2.Add(richTextBox1.Text);
al2.Add(richTextBox1.Text);
al2.Add(richTextBox1.Text);
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Do you want to compare them one by one, like this? =>
value0 = comapare(a1[0], a2[0]);
value1 = comapare(a1[1], a2[1]);
value2 = comapare(a1[2], a2[2]);
value3 = comapare(a1[3], a2[3]);
Then I would suggest you take a look at the Levenshtein Distance[^], which is a very good algorithm for comparing strings like used in spell checking programs or search engines.
You can find a very fast C# implementation here[^]
If you use .NET 2.0 then I'd also suggest you use generics, so you don't have to cast your objects to strings when accessing the list. Use List<string> instead 
regards
modified on Tuesday, April 22, 2008 3:21 PM
modified 12-Sep-18 21:01pm.
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ALright, the thing is I have no idea how to use the Levenshtein Distance.
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You can use the source from the link I posted, here's an example:
int differenceBetweenTwoWords = YetiLevenshtein(a1[index], a2[index]);
modified 12-Sep-18 21:01pm.
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You want to compare one word to the words in an ArrayList? Then there is no reason to repeat the word in an ArrayList. That won't help you the least bit in comparing them. Just loop though the list of words and compare them to the single word.
Unless you are stuck with framework 1.x, don't use an ArrayList at all. Use a List<string> instead.
Despite everything, the person most likely to be fooling you next is yourself.
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So I don´t need any complicated algorithms?
Could you give an example.
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Doesn't the ArrayList have a Contains method ? So you check if the ArrayList contains each word, one at a time.
Why are you using .NET 1.1 ?
Christian Graus
Please read this if you don't understand the answer I've given you
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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bool found = false;
string word = richTextBox1.Text;
foreach (string w in al) {
if (w == word) {
found = true;
break;
}
}
Despite everything, the person most likely to be fooling you next is yourself.
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dennycrane wrote: I´m making a spelling test.
If each of the words were spelled in the text box on it's own line, e.g.
[Textbox looks like this]
Foo
Bar
Bat
Baz Then I'd code it up like this:
string[] correctlySpelledWords = { "foo", "bar", "bat", "baz" };
string[] studentSpelledWords = textBox.Text.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
bool studentSpelledEverythingCorrectly = ContainsSameElements(correctlySpelledwords, studenSpelledWords);
....
bool ContainsSameElements(string[] first, string[] second)
{
if (first.Length != second.Length)
{
return false;
}
for (int i = 0; i < first.Length; i++)
{
if (!string.Equals(first, second, StringComparison.InvariantCultureIgnoreCase))
{
return false;
}
}
return true;
}That ignores casing (e.g. spelling "Foo" as "foo" is acceptable).
FWIW, you can probably do this in less code using a LINQ query if you're using the latest version of .NET.
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so this is what I have
don´t I need a list to compare though?
private void button1_Click(object sender, EventArgs e)
{
AthugaStafset();
ContainsSameElements(first, second);
}
public void ChkSpell()
{
string[] correctlySpelledWords = { "foo", "bar", "bat", "baz" };
string[] studentSpelledWords = richTextBox1.Text.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
bool studentSpelledEverythingCorrectly = ContainsSameElements(correctlySpelledWords, studentSpelledWords);
if (studentSpelledEverythingCorrectly)
{
label1.Text = "Same";
}
else
{
label1.Text = "They differ";
}
}
public bool ContainsSameElements(string[] first, string[] second)
{
if (first.Length != second.Length)
{
return false;
}
for (int i = 0; i < first.Length; i++)
{
if (!string.Equals(first, second, StringComparison.InvariantCultureIgnoreCase))
{
return false;
}
}
return true;
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dennycrane wrote: don´t I need a list to compare though?
You already do. These 2 lines are string arrays (a kind of list):
string[] correctlySpelledWords = { "foo", "bar", "bat", "baz" };
string[] studentSpelledWords = richTextBox1.Text.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
One is a list of correctly spelled words, another is th elist of student-spelled words.
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I'd go for:
List<string> correctSpellings;
List<string> userSpellings
correctSpellings.Add("string1");
...
userSpellings.Add(textBox.Text);
...
for(int i=0; i<userspellings.length; i++) {
if(String.Compare(userSpellings[i], correctSpellings[i], true) == 0)
else
}
String.Compare compares two strings, if they are equal then it returns 0. The 'true' part is to ignore case.
If your NOT going to ignore case, then you may as well just use if(userSpellings[i] == correctSpelling[i])
My current favourite word is: Bacon!
-SK Genius
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userSpelling.Length can´t be done.
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What is it then? userSpelling.Count? So i made a little mistake 
Oh yeah, and another mistake i may have made: initialising the lists, im pretty sure it needs to be more like: List<string> myList = new List<string>() Okay, thats all my mistakes fixed, are we all happy? good.
My current favourite word is: Bacon!
-SK Genius
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Yes, but now I only get "Incorrect" even though the spelling is correct.
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Perhaps the wrong strings are being compared? Set a breakpoint on the if statement and debug the code code. When it get to the if statement execution will pause and you'll be able to see which strings are being compared. From that you should be able to come up with a solution.
Or an easier way, show a message box with each of the strings in it, so just before the if statement and in a MessageBox.Show("Users:" + userSpelling[i] +", Correct:" + correctSpelling[i]); or similar.
My current favourite word is: Bacon!
-SK Genius
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The problem is the loop. You can't determine that the spelling is incorrect until you have looped through all the items. Now you are getting there when the first word doesn't match.
Look at the code that I posted elsewhere in the thread.
Despite everything, the person most likely to be fooling you next is yourself.
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Well, i made the assumption that the order of the words would be the same for the list of correct spellings and the text boxes the user would type into. Clearly we had different views on how the program worked, and obviously I got it wrong.
My current favourite word is: Bacon!
-SK Genius
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Well, the only thing different is I used RichTextBox
the text is written in the same order as the string is added.
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