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  • Array increment operator

    - by Stardust
    Could any one please tell me the meaning of "++" with array in the following code in Java: int [ ] arr = new int[ 4 ]; for(int i = 0; i < arr.length; i++){ arr[ i ] = i + 1; System.out.println(arr[ i ]++); } what is arr[ i ]++ meaning in above code, and why we can't do like: arr[ i ]++ = i + 1;

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  • C++: Pass array created in the function call line

    - by Jarx
    How can I achieve a result like somebody would expect it according to the following code example: // assuming: void myFunction( int* arr ); myFunction( [ 123, 456, 789 ] ); // as syntactical sugar for... int values[] = { 123, 456, 789 }; myFunction( values ); The syntax I thought would work spit out a compile error. How can I define an argument array directly in the line where the function is called?

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  • Longest item in array

    - by c00lryguy
    Is there an easier way than below to find the longest item in an array? arr = [ [0,1,2], [0,1,2,3], [0,1,2,3,4], [0,1,2,3] ] longest_row = [] @rows.each { |row| longest_row = row if row.length > longest_row.length } p longest_row # => [0,1,2,3,4]

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  • C++ [] array operator with multiple arguments?

    - by genesys
    Can I define in C++ an array operator that takes multiple arguments? I tried it like this: const T& operator[](const int i, const int j, const int k) const{ return m_cells[k*m_resSqr+j*m_res+i]; } T& operator[](const int i, const int j, const int k){ return m_cells[k*m_resSqr+j*m_res+i]; } But I'm getting this error: error C2804 binary operator '[' has too many parameters

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  • Loop over array and set all vars to false or true in javascript

    - by Sixfoot Studio
    Hi All, I need to loop over my array and set all the vars to false or true. I have tried numerous options, none of which are working and it's clearly my lack of javascript syntax knowledge..Please take a look at this: var closeAllCells = [IncomeOpen = "false", RehabOpen = "false", AttendantCareOpen = "false", HomeMaintenanceOpen = "false", DependantCareOpen = "false", IndexationOpen = "false", DeathFuneralOpen = "false", ComprehensiveOpen = "false", CollisionOpen = "false", LiabilityOpen = "false", DCPDOpen = "false"]; So my thinking is that I can just loop over this as follows for (var i=0;i<closeAllCells.length;i++) { closeAllCells[i] = true; // or false if I wished }

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  • List<MyClass*> & array question

    - by Nano HE
    Hi, Assuming a definition like this, list<MyCommand*> subList ... MyCommand* pCmd = (MyCommand*)(m_treeSM.GetItemData(node)); I tried these statements below, but failed. pCmd->subList[2] (pCmd->subList)[2] How can I get the array member values(such as subList[2]). I want to replace the value of subList[2] with other same type value. Thank you.

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  • Bit convector : Get byte array from string

    - by nCdy
    When I have a string like "0xd8 0xff 0xe0" I do Text.Split(' ').Select(part => byte.Parse(part, System.Globalization.NumberStyles.HexNumber)).ToArray(); But if I got string like "0xd8ffe0" I don't know what to do ? also I'm able for recommendations how to write byte array as one string.

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  • Convert an array of primitive longs into a List of Longs

    - by CaptainAwesomePants
    This may be a bit of an easy, headesk sort of question, but my first attempt surprisingly completely failed to work. I wanted to take an array of primitive longs and turn it into a list, which I attempted to do like this: long[] input = someAPI.getSomeLongs(); List<Long> = Arrays.asList(input); //Total failure to even compile! What's the right way to do this?

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  • MIN array function non zeros only

    - by user1717622
    I have been trying to get this array function to output (non-zero) minimum values in the 'FINAL DATA' AE column. Can you see a structural error in this formula? =IF($C$4="All EMEA", MIN(IF('FINAL DATA'!$2:$AE$250000<>0, ('FINAL DATA'!$J$2:$J$250000=$C$4)*('FINAL DATA'!$E$2:$E$250000=$E$4)*( 'FINAL DATA'!$AE$2:$AE$250000))), MIN(IF('FINAL DATA'!$AE$2:$AE$250000<>0, ('FINAL DATA'!$K$2:$K$250000=$C$4)*('FINAL DATA'!$E$2:$E$250000=$E$4)*( 'FINAL DATA'!$AE$2:$AE$250000))) )

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  • Flip Vertices Array

    - by James
    Hi, I have an array of position vertices that make up a 2D polygon. Vector2[] _chassisConcaveVertices = { new Vector2(5.122f, 0.572f), new Vector2(3.518f, 0.572f), new Vector2(3.458f, 0.169f), new Vector2(2.553f, 0.169f), new Vector2(2.013f, 0.414f), new Vector2(0.992f, 0.769f), new Vector2(0.992f, 1.363f), new Vector2(5.122f, 1.363f), }; What algorithm can I use to modify the positions so the resultant polygon is flipped? I need to flip the polygon both horizontally and vertically.

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  • String array definition in JAVA

    - by Mohamed KALLEL
    Is it possible to define array in this way in JAVA, otherwise are there an alternative close this definition? private final int CONST_0= 0; private final int CONST_1= 1; private final int CONST_2= 2; private final int CONST_3= 3; private final String[] CONST_TXTRECORDS = new String[] {[CONST_0] = "test0", {[CONST_1] = "test1", {[CONST_2] = "test2", {[CONST_3] = "test3"};

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  • convert a class to byte array + C#

    - by Newbie
    How can I convert a Class to byte array in C#. This is a managed one so the following code is failing int objsize = System.Runtime.InteropServices.Marshal.SizeOf(objTimeSeries3D); byte[] arr = new byte[objsize]; IntPtr buff = System.Runtime.InteropServices.Marshal.AllocHGlobal(objsize); System.Runtime.InteropServices.Marshal.StructureToPtr(objTimeSeries3D, buff, true); System.Runtime.InteropServices.Marshal.Copy(buff, arr, 0, objsize); System.Runtime.InteropServices.Marshal.FreeHGlobal(buff); Thanks

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  • how to loop through an array of vectors in C#

    - by Robert
    Hello everyone,I now have an array of vectors: static Vector3[] axes = new Vector3[] { Vector3.UnitX, Vector3.UnitY, Vector3.UnitZ }; and I want to loop through it,the code I write is: for(int i=0;i<axes.Length;i++) { do sth. about axes[i]; } However,it doesnt work and gets into infinite loop,could anyone help? thx.

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  • Improved way to build nested array of unique values in javascript

    - by dualmon
    The setup: I have a nested html table structure that displays hierarchical data, and the individual rows can be hidden or shown by the user. Each row has a dom id that is comprised of the level number plus the primary key for the record type on that level. I have to have both, because each level is from a different database table, so the primary key alone is not unique in the dom. example: id="level-1-row-216" I am storing the levels and rows of the visible elements in a cookie, so that when the page reloads the same rows the user had open are can be shown automatically. I don't store the full map of dom ids, because I'm concerned about it getting too verbose, and I want to keep my cookie under 4Kb. So I convert the dom ids to a compact json object like this, with one property for each level, and a unique array of primary keys under each level: { 1:[231,432,7656], 2:[234,121], 3:[234,2], 4:[222,423], 5:[222] } With this structure stored in a cookie, I feed it to my show function and restore the user's previous disclosure state when the page loads. The area for improvement: I'm looking for better option for reducing my map of id selectors down to this compact format. Here is my function: function getVisibleIds(){ // example dom id: level-1-row-216-sub var ids = $("tr#[id^=level]:visible").map(function() { return this.id; }); var levels = {}; for(var i in ids ) { var id = ids[i]; if (typeof id == 'string'){ if (id.match(/^level/)){ // here we extract the number for level and row var level = id.replace(/.*(level-)(\d*)(.*)/, '$2'); var row = id.replace(/.*(row-)(\d*)(.*)/, '$2'); // *** Improvement here? *** // This works, but it seems klugy. In PHP it's one line (see below): if(levels.hasOwnProperty(level)){ if($.inArray(parseInt(row, 10) ,levels[level]) == -1){ levels[level].push(parseInt(row, 10)); } } else { levels[level] = [parseInt(row, 10)]; } } } } return levels; } If I were doing it in PHP, I'd build the compact array like this, but I can't figure it out in javascript: foreach($ids as $id) { if (/* the criteria */){ $level = /* extract it from $id */; $row = /* extract it from $id */; $levels[$level][$row]; } }

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