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Searching for a string in a string

Dear stackoverflow members,
I have this string:
string data = "1Position1234Article4321Quantity2Position4323Article3323Quantity";
I want to search for the values where the "keyword" is Position. In this case I want to get back 1 and 2. Each value is "indexed" with its own "keyword". So the value 1 in this string has the Position seperator. The value 1234 has the Article seperator and the value 4321 has the Quantity seperator.
I need a way to search through the string and want to get all positions, articles and quantitys back. Without the keywords.
Output shout be:
string[] position = {"1", "2"};
string[] article = {"1234", "4323"};
string[] quantity = {"4321", "3323"};
Hopefully some can help me here.
Thanks!

This is q quick solution I've come up with in LinqPad:
void Main()
{
string data = "1Position1234Article4321Quantity2Position4323Article3323Quantity";
var Articles = Indices(data, "Article").Dump("Articles: ");
var Posistions = Indices(data, "Position").Dump("Positions :");
var Quantities = Indices(data, "Quantity").Dump("Quantities :");
}
// Define other methods and classes here
public List<int> Indices(string source, string keyword)
{
var results = new List<int>();
//source: http://stackoverflow.com/questions/3720012/regular-expression-to-split-string-and-number
var temp = Regex.Split(source, "(?<Alpha>[a-zA-Z]*)(?<Numeric>[0-9]*)").ToList().Where (r => !String.IsNullOrEmpty(r)).ToList();
//select the list with index only where key word matches
var indices = temp.Select ((v,i) => new {index = i, value = v})
.Where (t => t.value == keyword);
foreach (var element in indices)
{
int val;
//get previous list entry based on index and parse it
if(Int32.TryParse(temp[element.index -1], out val))
{
results.Add(val);
}
}
return results;
}
Output:

Here's a possible algorithm:
Run trough the list and take each number / keyword.
Put them in a dictionary with key "keyword", value a list with all "numbers".
Iterate the dictionary and print they key + its values.

Below snippet can use to get the output like what you expected.
string data = "1Position1234Article4321Quantity2Position4323Article3323Quantity";
StringBuilder sb = new StringBuilder();
StringBuilder sbWord = new StringBuilder();
bool isDigit = false;
bool isChar = false;
Dictionary<int, string> dic = new Dictionary<int, string>();
int index = 0;
for (int i = 0; i < data.Length; i++)
{
if (char.IsNumber(data[i]))
{
isDigit = true;
if (isChar)
{
dic.Add(index, sb.ToString() + "|" + sbWord.ToString());
index++;
isChar = false;
sb.Remove(0, sb.Length);
sbWord.Remove(0, sbWord.Length);
}
}
else
{
isDigit = false;
isChar = true;
sbWord.Append(data[i]);
}
if (isDigit)
sb.Append(data[i]);
if (i == data.Length - 1)
{
dic.Add(index, sb.ToString() + "|" + sbWord.ToString());
}
}
List<string> Position = new List<string>();
List<string> Article = new List<string>();
List<string> Quantity = new List<string>();
if (dic.Count > 0)
{
for (int i = 0; i < dic.Count; i++)
{
if (dic[i].Split('|')[1] == "Position")
Position.Add(dic[i].Split('|')[0]);
else if (dic[i].Split('|')[1] == "Article")
Article.Add(dic[i].Split('|')[0]);
else
Quantity.Add(dic[i].Split('|')[0]);
}
}
string[] Position_array = Position.ToArray();
string[] Article_array = Article.ToArray();
string[] Quantity_array = Quantity.ToArray();

Try this simple solution.
class StrSplit{
public static void main(String args[]){
int i;
String str = "1Position1234Article4321Quantity2Position4323Article3323Quantity";
String pattern= "(?<=Position)|(?<=Article)|(?<=Quantity)";
String[] parts = str.split(pattern);
List<String> Position = new ArrayList<String>();
List<String> Article = new ArrayList<String>();
List<String> Quantity = new ArrayList<String>();
for( i=0;i<parts.length;i++)
{
pattern="Position";
String[] subParts;
if(parts[i].contains(pattern))
{
subParts = parts[i].split(pattern);
Position.add(subParts[0]);
}
pattern="Article";
if(parts[i].contains(pattern))
{
subParts = parts[i].split(pattern);
Article.add(subParts[0]);
}
pattern="Quantity";
if(parts[i].contains(pattern))
{
subParts = parts[i].split(pattern);
Quantity.add(subParts[0]);
}
}
System.out.println("Position:");
for(i = 0; i < Position.size(); i++) {
System.out.println(Position.get(i));
}
System.out.println("Article:");
for(i = 0; i < Article.size(); i++) {
System.out.println(Article.get(i));
}
System.out.println("Quantity:");
for(i = 0; i < Quantity.size(); i++) {
System.out.println(Quantity.get(i));
}
}
}
Output:
Position:
1
2
Article:
1234
4323
Quantity:
4321
3323

Cutting a string into array of <"x" chars each [closed]

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I have a situation where my string can't go past a certain point, so what I want to do is cut it into smaller strings of "x" characters, and then print them one by one on top of each other. They don't all need to be equal, if x is 5, and I have an 11 character string, printing 3 lines with 5, 5, and 1 characters is fine. Is there an easy way to do this in C#?
Example:
string Test = "This is a test string";
stringarray = Cutup(Test, 5);
//Result:
//"This "
//"is a "
//"test "
//"strin"
//"g"

try something like this:
public string[] Cutcup(string s, int l)
{
List<string> result = new List<string>();
for (int i = 0; i < s.Length; i += l)
{
result.Add(s.Substring(i, Math.Min(5, s.Substring(i).Length)));
}
return result.ToArray();
}

You could cut up the strings then do a test.lastIndexOf(' '); If that helps

You can use the String Manipultion function Substring() and a for loop to accomplish this.

here is an example
int maxChars = 5;
String myStr = "This is some text used in testing this method of splitting a string and just a few more chars and the string is complete";
List<String> mySubStrings = new List<String>();
while (myStr.Length > maxChars)
{
mySubStrings.Add(myStr.Substring(0,maxChars));
myStr = myStr.Substring(maxChars);
}
mySubStrings.ToArray();

List<string> result = new List<string>();
string testString = "This is a test string";
string chunkBuilder = "";
int chunkSize = 5;
for (int i = 0; i <= testString.Length-1; i++)
{
chunkBuilder += testString[i];
if (chunkBuilder.Length == chunkSize || i == testString.Length - 1)
{
result.Add(chunkBuilder);
chunkBuilder = "";
}
}

Another try, with less string concatenations
string Test = "This is a test string";
List<string> parts = new List<string>();
int i = 0;
do
{
parts.Add(Test.Substring(i,System.Math.Min(5, Test.Substring(i).Length)));
i+= 5;
} while (i < Test.Length);

Here are a couple more ways. Cutup2 below is more efficient but less pretty. Both pass the test case given.
private static IEnumerable<string> Cutup(string given, int chunkSize)
{
var skip = 0;
var iterations = 0;
while (iterations * chunkSize < given.Length)
{
iterations++;
yield return new string(given.Skip(skip).Take(chunkSize).ToArray());
skip += chunkSize;
}
}
private static unsafe IEnumerable<string> Cutup2(string given, int chunkSize)
{
var pieces = new List<string>();
var consumed = 0;
while (consumed < given.Length)
{
fixed (char* g = given)
{
var toTake = consumed + chunkSize > given.Length
? given.Length - consumed
: chunkSize;
pieces.Add(new string(g, consumed, toTake));
}
consumed += chunkSize;
}
return pieces;
}

All in one line
var size = 5;
var results = Enumerable.Range(0, (int)Math.Ceiling(test.Length / (double)size))
.Select(i => test.Substring(i * size, Math.Min(size, test.Length - i * size)));

I once made an extensionmethod that can be used for this:
public static IEnumerable<IEnumerable<T>> Subsequencise<T>(this IEnumerable<T> input, int subsequenceLength)
{
var enumerator = input.GetEnumerator();
SubsequenciseParameter parameter = new SubsequenciseParameter { Next = enumerator.MoveNext() };
while (parameter.Next)
yield return getSubSequence(enumerator, subsequenceLength, parameter);
}
private static IEnumerable<T> getSubSequence<T>(IEnumerator<T> enumerator, int subsequenceLength, SubsequenciseParameter parameter)
{
do
{
yield return enumerator.Current;
} while ((parameter.Next = enumerator.MoveNext()) && --subsequenceLength > 0);
}
// Needed to let the Subsequencisemethod know when to stop, since you cant use out or ref parameters in an yield-return method.
class SubsequenciseParameter
{
public bool Next { get; set; }
}
then you can do this:
string Test = "This is a test string";
stringarray = Test.Subsequencise(5).Select(subsequence => new String(subsequence.Toarray())).Toarray();

Here's a rather LINQy one-liner:
static IEnumerable<string> SliceAndDice1( string s , int n )
{
if ( s == null ) throw new ArgumentNullException("s");
if ( n < 1 ) throw new ArgumentOutOfRangeException("n");
int i = 0 ;
return s.GroupBy( c => i++ / n ).Select( g => g.Aggregate(new StringBuilder() , (sb,c)=>sb.Append(c)).ToString() ) ;
}
If that gives you a headache, try the more straightforward
static IEnumerable<string> SliceAndDice2( string s , int n )
{
if ( s == null ) throw new ArgumentNullException("s") ;
if ( n < 1 ) throw new ArgumentOutOfRangeException("n") ;
int i = 0 ;
for ( i = 0 ; i < s.Length-n ; i+=n )
{
yield return s.Substring(i,n) ;
}
yield return s.Substring(i) ;
}

Need to convert javascript code to c#

I have found a javascript library that compresses and decompresses a string. I'm writing a program in C# that creates a javascript. in this script, all images needs to be converted to base64string and then compressed so that when the script is executed the decompress function, decompress then and show the images.
both compress and the compress functions work fine but I need the exact c# version of the compressor so that javascript decompressor can decompress it. here is the library:
function lzw_encode(s) {
var dict = {};
var data = (s + "").split("");
var out = [];
var currChar;
var phrase = data[0];
var code = 256;
for (var i = 1; i < data.length; i++) {
currChar = data[i];
if (dict[phrase + currChar] != null) {
phrase += currChar;
}
else {
out.push(phrase.length > 1 ? dict[phrase] : phrase.charCodeAt(0));
dict[phrase + currChar] = code;
code++;
phrase = currChar;
}
}
out.push(phrase.length > 1 ? dict[phrase] : phrase.charCodeAt(0));
for (var i = 0; i < out.length; i++) {
out[i] = String.fromCharCode(out[i]);
}
return out.join("");
}
// Decompress an LZW-encoded string
function lzw_decode(s) {
var dict = {};
var data = (s + "").split("");
var currChar = data[0];
var oldPhrase = currChar;
var out = [currChar];
var code = 256;
var phrase;
for (var i = 1; i < data.length; i++) {
var currCode = data[i].charCodeAt(0);
if (currCode < 256) {
phrase = data[i];
}
else {
phrase = dict[currCode] ? dict[currCode] : (oldPhrase + currChar);
}
out.push(phrase);
currChar = phrase.charAt(0);
dict[code] = oldPhrase + currChar;
code++;
oldPhrase = phrase;
}
return out.join("");
}
can anybody help me with conversion of the lzw_encode function to C#?

There is an open-source library called Sharp-LZW that provides LZW encoding and decoding in C#. You can find it here: https://code.google.com/p/sharp-lzw/

How do i check if the List length is bigger than the last time?

I have this code:
int LRLength = LR.Count;
for (int i = 0; i < LR.Count; i++)
{
LRLength = LR.Count;
LR = merge(LR);
if (LR.Count < LRLength)
{
LR = merge(LR);
if (LR.Count == LRLength)
{
break;
}
}
}
And this is the function merge:
private List<Lightnings_Extractor.Lightnings_Region> merge(List<Lightnings_Extractor.Lightnings_Region> Merged)
{
List<Lightnings_Extractor.Lightnings_Region> NewMerged = new List<Lightnings_Extractor.Lightnings_Region>();
Lightnings_Extractor.Lightnings_Region reg;
int dealtWith = -1;
for (int i = 0; i < Merged.Count; i++)
{
if (i != dealtWith)
{
reg = new Lightnings_Extractor.Lightnings_Region();
if (i < Merged.Count - 1)
{
if (Merged[i].end + 1 >= Merged[i + 1].start)
{
reg.start = Merged[i].start;
reg.end = Merged[i + 1].end;
NewMerged.Add(reg);
dealtWith = i + 1;
}
else
{
reg.start = Merged[i].start;
reg.end = Merged[i].end;
NewMerged.Add(reg);
}
}
else
{
reg.start = Merged[i].start;
reg.end = Merged[i].end;
NewMerged.Add(reg);
}
}
}
return NewMerged;
}
In this class: Lightnings_Extractor.Lightnings_Region I have only two int variables.
The idea in this function is to get a List and merge areas that are congruent.
For example once im calling the function and the List LR Length is 8 now I will get it back less. For example if it needed to merge two indexs to one then the List I will get in return the Length will be 7. If it will need to merge another indexs then the Length will be 6 and so on.
What I want to check on the first code above is when I should stop calling the function to merge indexs.
If the length was 8 and the next time it's still 8 do nothing stop the loop.
If the length is 8 and the next time it's 7 then call the function again.
If the length is 7 stop the loop . But if the length is 6 keep calling it once again.
Untill the last length will be the same as the length before !!!
So I tried this code but it's not working good:
int LRLength = LR.Count;
for (int i = 0; i < LR.Count; i++)
{
LRLength = LR.Count;
LR = merge(LR);
if (LR.Count < LRLength)
{
LR = merge(LR);
if (LR.Count == LRLength)
{
break;
}
}
}

Trying to make some assumptions as to what you're trying to accomplish. The following will basically capture the original length of the list for comparison. It will run at least once, and keep running until the LRLength == LR.Count
int LRLength = LR.Count;
do{
LR = merge(LR);
} while(LR.Count != LRLength);
If you were trying to run the loop until you got the same count twice in a row:
int prevCount;
do{
prevCount = LR.Count;
LR = merge(LR);
} while(prevCount != LR.Count);

function works correctly from MATLAB, but not when called from .NET

I'm using MATLAB Builder NE for interoperability to call MATLAB functions from a C# .NET program built as a plug-in for the open source application ClearCanvas. When I run the code normally from the .NET program, I usually (but not always) get the error message
MWMCR::EvaluateFunction error ... Reference to non-existent element of a cell array. Error in => ComputeT1Maps.m at line 178.
The line of MATLAB code in question is as follows:
seriesHeader = currentSlab.Slice{1}.MetaData{1}.Header;
Header is a struct of the form given by MATLAB's dicominfo function and MetaData{n} is a struct that contains the filename and image header struct for the nth image file.
The function signature for the ComputeT1Maps function is:
function ComputeT1Maps(data, options)
To try to figure out this bug I put the following line in at the beginning of the ComputeT1Maps function in order to preserve state so I could see what values were passed to MATLAB from .NET:
save(fullfile('F:\MATLAB\T1Mapping', 'T1_debug.mat'), 'data', 'options', ...
'-mat', '-v7.3');
So, having preserved the inputs to this function (received from the .NET program that called it), I then tried running my ComputeT1Maps function from an interactive MATLAB session after loading in the saved variables, so that I could utilize MATLAB's debugging tools to figure out why I was getting the error. That's when things got really bizarre. The function works just fine from the interactive MATLAB session when given the exact same operands that were given to it when it was called from my .NET program. How can this be? How can the function fail when called from C# .NET, but run properly when given the exact same input in an interactive MATLAB session? Also, this same code used to work before and the error only began to happen after I updated both my local installation of MATLAB and the MCR to the latest version (2011b).
On the .NET side, the data that is passed to MATLAB is constructed by the following function:
public void ExchangeData(MultidimensionalDataCollection mdc, string outputPath, bool generateAncillaryTestImages,
bool excludeAcquisitions, double[] exclusionList, bool showProgressBar, bool displayComputedImages,
bool pauseAtEachSlice, bool softwareDiagnostics, bool displayProgressBar)
{
try
{
int subspaceIndex = 0;
int slabIndex = 0;
int sliceIndex = 0;
int imageIndex = 0;
MWStructArray topLevelGrouping;
MWCellArray geometricSubspaceList;
MWStructArray geometricGrouping;
MWCellArray slabList;
MWStructArray slabGrouping;
MWCellArray sliceList;
MWStructArray sliceGrouping;
MWCellArray imageMetaData;
MWStructArray perImageData;
MWArray[] result;
MWLogicalArray successFlag;
MWStructArray header;
MWCellArray sopInstanceUids;
MWStructArray t1MapOptions;
topLevelGrouping = new MWStructArray(1, 1, new string[] { "GeometricSubspace",
"GeometricSubspaceCount" });
topLevelGrouping["GeometricSubspaceCount", 1] = mdc.Count;
geometricSubspaceList = new MWCellArray(1, mdc.Count);
subspaceIndex = 0;
foreach (GeometricSubspace subspace in mdc)
{
subspaceIndex++;
geometricGrouping = new MWStructArray(1, 1, new string[] { "Slab",
"SlabCount" });
geometricGrouping["SlabCount", 1] = subspace.Count;
slabList = new MWCellArray(1, subspace.Count);
slabIndex = 0;
foreach (Slab slab in subspace)
{
slabIndex++;
slabGrouping = new MWStructArray(1, 1, new string[] { "Slice",
"SliceCount" });
slabGrouping["SliceCount", 1] = slab.Count;
sliceList = new MWCellArray(1, slab.Count);
sliceIndex = 0;
foreach (Slice slice in slab)
{
sliceIndex++;
sliceGrouping = new MWStructArray(1, 1, new string[] {
"ImageCount", "MetaData", "MultidimensionalPixelData",
"SliceLocation", "SopInstanceUids" });
sliceGrouping["ImageCount", 1] = slice.Count;
imageMetaData = new MWCellArray(1, slice.Count);
int rows, columns;
short[,,,] multidimensionalPixelData = null;
imageIndex = 0;
foreach (Image image in slice)
{
imageIndex++;
short[,] imageMatrix = null;
if (!image.ImageSopClass.DicomUid.Equals(DicomUids.MRImageStorage))
throw new NotSupportedException("SopClass " + image.ImageSopClass.Name + " is not supported.");
else
{
DicomUncompressedPixelData rawPixelData = image.PixelData;
imageMatrix = GetCCImageMatrix(rawPixelData, out rows, out columns);
if (imageIndex == 1)
{
multidimensionalPixelData = new short[slice.Count, 1, columns, rows];
}
for (int i = 0; i < rows; i++)
{
for (int j = 0; j < columns; j++)
{
// Remember that C# array indices start with 0 while in MATLAB they start with 1
multidimensionalPixelData[imageIndex - 1, 0, i, j] = imageMatrix[i, j];
}
}
}
perImageData = new MWStructArray(1, 1, new string[] { "FileName", "Header" });
perImageData["FileName", 1] = image.FileName;
result = _mlT1Mapping.QT1GetDicomHeader(2, image.FileName);
if (result == null)
throw new Exception("GetDicomHeader failed to read the header file for filename: " +
image.FileName);
else
{
// MWStructArray
successFlag = (MWLogicalArray)result[0];
bool[] headerObtained = successFlag.ToVector();
if (headerObtained[0])
{
header = (MWStructArray)result[1];
perImageData["Header", 1] = header;
imageMetaData[1, imageIndex] = perImageData;
}
else
{
Console.WriteLine("GetDicomHeader failed to read the header file for filename: " +
image.FileName);
}
}
}
sliceList[1, sliceIndex] = sliceGrouping;
sliceGrouping["MetaData", 1] = imageMetaData;
sliceGrouping["SliceLocation", 1] = slice.SliceLocation;
List<string> theSops = slice._sopList;
sopInstanceUids = new MWCellArray(1, slice._sopList.Count);
int count = 0;
foreach (string sop in theSops)
{
count++;
sopInstanceUids[1, count] = sop;
}
sliceGrouping["SopInstanceUids", 1] = sopInstanceUids;
sliceGrouping["MultidimensionalPixelData", 1] = (MWNumericArray)multidimensionalPixelData;
}
slabList[1, slabIndex] = slabGrouping;
slabGrouping["Slice", 1] = sliceList;
}
geometricSubspaceList[1, subspaceIndex] = geometricGrouping;
geometricGrouping["Slab", 1] = slabList;
}
topLevelGrouping["GeometricSubspace", 1] = geometricSubspaceList;
t1MapOptions = new MWStructArray(1, 1, new string[] { "DirectoryPath",
"ComputeDifferenceImages", "ComputeMultiplicationImages", "DisplayComputedImages", "PauseAtEachSlice",
"SoftwareDiagnostics", "DisplayProgressBar"
});
t1MapOptions["DirectoryPath"] = (MWCharArray)outputPath;
t1MapOptions["SaveS0Maps"] = (MWLogicalArray)generateAncillaryTestImages;
t1MapOptions["ExcludeAcquisitions"] = (MWLogicalArray)excludeAcquisitions;
t1MapOptions["ExclusionList"] = (MWNumericArray)exclusionList;
t1MapOptions["DisplayComputedImages"] = (MWLogicalArray)displayComputedImages;
t1MapOptions["PauseAtEachSlice"] = (MWLogicalArray)pauseAtEachSlice;
t1MapOptions["SoftwareDiagnostics"] = (MWLogicalArray)softwareDiagnostics;
t1MapOptions["DisplayProgressBar"] = (MWLogicalArray)displayProgressBar;
_mlT1Mapping.ComputeT1Maps(topLevelGrouping, t1MapOptions);
}
catch (Exception)
{
throw;
}
}

I'm not yet 100% certain that I've fixed everything, but so far the tests appear to be succeeding after a few changes. It seems that the crux of the problem was that the order of some assignments was transposed. This occurred in a few places. For example, instead of:
sliceList[1, sliceIndex] = sliceGrouping;
sliceGrouping["MetaData", 1] = imageMetaData;
it should have been ordered as:
sliceGrouping["MetaData", 1] = imageMetaData;
sliceList[1, sliceIndex] = sliceGrouping;
The strange thing about this bug was that the code worked just fine in the previous version of MATLAB. It should have never worked at all!