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  • Optimizing list comprehension to find pairs of co-prime numbers

    - by user3685422
    Given A,B print the number of pairs (a,b) such that GCD(a,b)=1 and 1<=a<=A and 1<=b<=B. Here is my answer: return len([(x,y) for x in range(1,A+1) for y in range(1,B+1) if gcd(x,y) == 1]) My answer works fine for small ranges but takes enough time if the range is increased. such as 1 <= A <= 10^5 1 <= B <= 10^5 is there a better way to write this or can this be optimized?

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  • We are moving an Access based corporate front-end into a Web-based App

    - by Max Vernon
    We have an enterprise application with a front end written in Microsoft Access 2003 that has evolved over the past 6 years. The back end data, and a fair amount of back-end logic is contained within several Microsoft SQL Server databases. This front end app consists of around 180 forms, and over 120,000 lines of code, and interacts with VB.Net DLLs that support various critical functions used by our sales force. The current system makes use of 3 monitors to display various information; the Access app uses COM+ to control Microsoft Outlook and Internet Explorer for various purposes. The Access front end sometimes occupies 2 screens, automatically resizing itself based on Windows API-reported screen dimensions. The app also uses a Google map to present data to our agents, and allows two-way interactivity with the map through COM+ connectivity to JavaScript contained in the Google map. At the urging of senior management, we are looking to completely rewrite this application using some web-based technology, such as ASP.Net or perhaps a LAMP stack (the thinking with the LAMP stack thing is "free" is pretty cheap). We want to move to a web-based app so we can eliminate the dependency on our physical location for hiring new sales force members. Currently, our main office is full to capacity, and we need to continue growing the company. Does anyone have any thoughts on what would be the best technology to use for a web-based app of this magnitude? Keeping in mind the app is dependent on back-end services on our existing infrastructure. The app handles financial data and personal customer data, among other things. [I've looked at Best practices for moving large MS Access application towards .Net? and read the answers, and most of the comments. Interesting reading, and has some valid points, but our C.O.O. and contracted Software Architect are pushing for a full web-based app, not a .Net Windows App]

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  • Counting number of times an item occurs in a linked list

    - by HanaCHaN92
    Here is the assignment: Here's the assignment: Implement a method countValue() that counts the number of times an item occurs in a linked list. Remember to use the STL list. int countValue(list front, const int item); Generate 20 random numbers in the range of 0 to 4, and insert each number in the linked list. Output the list by using a method which you would call writeLinkedList which you would add to the ListP.cpp. In a loop, call the method countValue() , and display the number of occurrences of each value from 0 to 4 in the list. Remember that all the above is to be included in the file ListP.ccp Run: 2 3 4 0 1 0 2 4 2 3 3 4 3 3 3 0 0 2 0 2 0 : 5, 1 : 1, 2 : 5, 3 : 6, 4 : 3 and here is what I have so far: #include<iostream> #include<list> #include<tchar.h> int countValue(list<int> front, const int item); using namespace std; int _tmain(int argc, _TCHAR* argv[]){ list<int> front; int listCount; cout << "Enter the size of the list: "; cin >> listCount; for (int i = 1; i <= listCount; i++) front.insert(rand()%5); cout << "Original List of Values: " << endl; //writeLinkedList(front, " "); cout << endl; for(int j=0;j<5;++j) cout << countValue (front,j) << endl; cout << endl; return 0; } int countValue(list<int> front, const int item) { int count0; int count1; int count2; int count3; int count4; list<int> *List; for(list<int>::iterator i = front.begin(); i != front.end(); i++) { if(List->item == 0) { count0++; } if(List->item == 1) { count1++; } if(List->item == 2) { count2++; } if(List->item == 3) { count2++; }if(List->item == 4) { count4++; } } } And here are the errors: error C2065: 'list' : undeclared identifier line 5 error C2062: type 'int' unexpected line 5 error C2661: 'std::list<_Ty>::insert' : no overloaded function takes 1 arguments line 16 error C3861: 'countValue': identifier not found line 21 IntelliSense: no instance of overloaded function "std::list<_Ty, _Ax>::insert [with _Ty=int, _Ax=std::allocator<int>]" matches the argument list line 16 IntelliSense: too few arguments in function call line 16 error C2039: 'item': is not a member of 'std::list<_Ty>' lines 34, 38, 42, 46, 49 IntelliSense: declaration is incompatible with "int countValue" (declared at line 5) line 25 IntelliSense: class "std::list<int, std:: allocator<int>>" has no member "item" lines 34, 38, 42, 46, 49 I just want to know what I've done wrong and how to fix it and also if someone could help me figure out if I'm doing the countValue function wrong or not based on the instructions I would really appreciate it. I've read the chapter in our textbook several times, looked up tutorials on youtube and on Dream in Code, and still I can not figure this out. All helpful information is appreciated!

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  • Check if access table exists

    - by HasanGursoy
    I want to log web site visits' IP, datetime, client and refferer data to access database but I'm planning to log every days log data in separate tables in example logs for 06.06.2010 will be logged in 2010_06_06 named table. When date is changed I'll create a table named 2010_06_07. But the problem is if this table is already created. Any suggestions how to check if table exists in Access?

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  • Retrieve list of indexes in an Access database

    - by waanders
    I know there's a way to get a list of all tables in an Access database by using the quering the MsysObjects: "SELECT MSysObjects.Name FROM MsysObjects WHERE (Left$([Name],1)<'~') AND (Left$([Name],4)<'Msys') AND (MSysObjects.Type)=1 ORDER BY MSysObjects.Name" Does anybody know a similar (or other) way to retrieve a list of all indexes in an MS-Access database?

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  • Get Autonumber from newly inserted record in Access 2007 using Enterprise Library 4.1

    - by silverCORE
    It's been ages since I last used Access as a back end but I'm being forced to. I'm using Enterprise Library 4.1, the Data Access Application Block.. with .NET 3.5 and I wanted to know the best way (code sample if possible) to write an insert query that will automatically give me the newly inserted auto-number back..or if it's not possible to do it in one step, how do you recommend doing it? thanks for your help.

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  • Create Directory for records in MS Access 2007

    - by glinch
    Hi there, Is it possible to create a directory folder for individual records in Access 2007. For example tblUser ID firstName surName When adding a record, would create a folder C:\userdatabase\Surname,firstName,ID Could see this being useful in situations for example where a large amount of images/files would need to be associated with a record. Access would create and link to a directory for each record. Thanks in advance for any advice Noel

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  • When importing an Access table into Excel, a look-up column is showing all values as numbers

    - by user3651997
    I have a basic Access to Excel question that has me frustrated. I have two Access 2010 data tables. One is a list of managers. The primary key is a manager ID (which is an autonumber because managers can have the same name), and each row also has manager name, manager email, etc. The second data table is a list of departments. The primary key for each row is a unique department code, and the foreign key is a manager ID (autonumber). I used the Look-up Wizard to create this connection. However, Access does not show the manager ID in the foreign key location. It shows Manager Name like I requested when I used the Look-up Wizard. Now I am trying to import the second table (departments) into Excel 2010. I clicked import from Access, chose the Department table, and everything popped into Excel. BUT, the Manager Name column is showing Manager ID instead. So I have a list of numbers instead of names. How can I make Excel show what I see in Access? Thanks!

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  • Access 2003 VBA: Return only the index of the last item selected in a ListBox

    - by Eric D. Johnson
    I will preface this with saying, this is my first time using listboxes and earlier posts were criticized for lacking detail. So, all help is greatly appreciated and I hope this is enough information without being overkill. Currently, I have a listbox updating a junction table with an on click event (iterates through selected items and if they are not in the table it adds them). The list box is also updated by an option group (based on the option group value a query populates the list with the appropriate items and they are selected/highlighted based on the junction table). Also, when items are a "sub-category" the "category" is also selected. This functions perfectly until I ask it to do more... Problem 1: I need to differentiate "categories" of items from each other. So, I have included a blank item to the list box to add a space between categories. When the blank items are present the listbox does not update the junction table properly and vice versa. Problem 2: My users want to be able to deselect the "category" under certain circumstances. This is fine, just de-select the "category" after the "sub-category" is selected. However, the "category" is re-selected whenever the listbox is clicked again because it iterates through all entries. Perceived solution for both problems: Return only the index of the item (de)selected and manipulate accordingly. Is this possible? If so, how? OR: Should I take a different approach?

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  • Adding new records in Access without wrecking the form

    - by Matt Parker
    I'm working on a simple Access 2003 application to keep track of things that need to be done for clients for some colleagues. Each colleague has a set of clients, and each client has a set of actions that need to be taken by a certain date. I've set up a form that consists of a combobox for client ID (indexed), a drop-down for the person who is handling that client's case, and a button for adding new clients (a standard Access-created Add Record button). The actions are listed in a subform below these three elements. The problem I've run into is that the first person I tested this on clicked the button to add a new record, then didn't fill it out and tried to select another client from the drop-down list. Access interprets this as an attempt to set the selected Client ID as the ID for the new record and rightfully throws an error for duplicate primary keys. I can think of a couple of ways around this problem, but I'd much rather hear your elegant solutions than kludge together some junk in a language I don't know. Let me know if you have any questions. Thank you.

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  • Best way to choose random element from weighted list

    - by Qqwy
    I want to create a simple game. Every so often, a power up should appear. Right now the different kinds of power ups are stored in an array. However, not every power up should appear equally often: For instance, a score multiplier should appear much more often than an extra life. What is the best/fastest way to pick an element at random from a list where some of the elements should be picked more often than others?

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  • Multiuser's impact on Access Database

    - by SilentRage47
    Can someone explain to me how are effected the performances of an Access 2003 DB when it's used by a lot (30) of users on the same LAN? I'm working on a vb6 project with this access 2003 DB wich performs ok on my local PC, but it's terrible when used across 20-30 users. It's there something I can do to improve performance? How can I understand what's the cause of this degradation in performance?

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  • Access / Excel crossover: Should i attach spreadsheets to records

    - by glinch
    Hi, I currently have an archaic system of client records that I am trying to improve. For each client i have a directory, in that directory i include a directory for each job. Each job has a spreadsheet that i use to store their personal details, and run calculations and costings specific to their needs. In turn I also have word documents that are linked to their spreadsheet which automatically update accordingly. The spreadsheet is also exported as a pdf as well I am trying to build a database of customer records in Access, straight forward enough. For each new customer i need to be able to add the appropriate spreadsheet to their records, update the spreadsheet accordingly with their details, use the spreadsheet to calculate their costings etc.. I do not want to enter the same information repeatedly, and would like a cohesive system, with data being passed between access and excel. Should this be easy enough to do with the two packages? Thanks in advance Noel

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  • Problem with Access 2003 linking tables with SQL Server 2008 using ODBC

    - by tyguy840
    I am trying to link an Access 2003 DB to tables in a SQL Server 2008 database using ODBC. When I try to link to tables that have Primary Key established I get the following error message. " 'Pk_dbo.Batch_Claims' is not a valid name. Make sure that it does not include invalid characters or punctuation and that it is not to long. " Pk_dbo.Batch_Claims is the key value I see when looking at the table through SSMS. I have used Access for awhile but am somewhat new to SQL Server and connections using ODBC. Any help would be appreciated. Thanks

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  • Import Paradox table in Access database: Incorrect collating sequence

    - by waanders
    Hello, I have a Paradox 5.0 database and want to migrate it to Access 2007. But if I try to import a Paradox table, Access gives an error message: "Incorrect collating sequence". The Help says: "You tried to link a Paradox table that was created with an international sort order that is not the same as the one you are using". What am I doing wrong? How can a change that sort order? Anybody? Thanks in advance.

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  • Change an access Primary key with relationships

    - by DiegoMaK
    I have a database in access 2007 accdb extension , there are more or less 30-40 tables with related primary key "local_number". it is a text primary key with 10 lenght. How can I change the length of this primary key to 30 WITHOUT delete previosly all the 30 relationship. 2,A similar question. I need add a compose primary key to my PK "local_number". I need Add a "Date" as composed PK. Then access just allow this if I first delete all relationships. How can Avoid this warning and change my PK ignoring this message.

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  • Error on Access database: Permission denied: 'CreateObject'

    - by elixireu
    Hi, I am migrating a website over to a new server, its in ASP and uses several Access databases, the site and CMS can read, display the data, and even edit and update existing data entries, but when I want to add a new entry, I get an error... Microsoft VBScript runtime error '800a0046' Permission denied: 'CreateObject' /padp2010d/ads_tradetracker.asp, line 11 There seems to be no passwords on the databases, I have set up and tested the ODBC Data Sources and they are working fine. The code or line that is causing the problem is... <% Dim Mail, strPath, strHost, Upload Set Upload = CreateObject("Persits.Upload") Upload.IgnoreNoPost = True ' Generate unique names Upload.OverwriteFiles = False ' Limit file size to 500000 bytes Upload.SetMaxSize 500000, True ' capture an upload and save uploaded files (if any) in temp directory Upload.SaveVirtual "\pa\images\advertenties" Upload.Save ' Use session ID as the new file name NewName = Session.SessionID The line 11 is Set Upload = CreateObject("Persits.Upload") If anyone could help that would be great. Could it be a Permission setting? Im a complete novice with ASP and Access! Thanks

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  • Search one element of a list in another list recursively

    - by androidnoob
    I have 2 lists old_name_list = [a-1234, a-1235, a-1236] new_name_list = [(a-1235, a-5321), (a-1236, a-6321), (a-1234, a-4321), ... ] I want to search recursively if the elements in old_name_list exist in new_name_list and returns the associated value with it, for eg. the first element in old_name_list returns a-4321, second element returns a-5321, and so on until old_name_list finishes. I have tried the following and it doesn't work for old_name, new_name in zip(old_name_list, new_name_list): if old_name in new_name[0]: print new_name[1] Is the method I am doing wrong or I have to make some minor changes to it? Thank you in advance.

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  • setting up linked list Java

    - by erp
    I'm working on some basic linked list stuff, like insert, delete, go to the front or end of the list, and basically i understand the concept of all of that stuff once i have the list i guess but im having trouble setting up the list. I was wondering of you guys could tell me if im going in the right direction. (mostly just the setup) this is what i have so far: public class List { private int size; private List linkedList; List head; List cur; List next; /** * Creates an empty list. * @pre * @post */ public List(){ linkedList = new List(); this.head = null; cur = head; } /** * Delete the current element from this list. The element after the deleted element becomes the new current. * If that's not possible, then the element before the deleted element becomes the new current. * If that is also not possible, then you need to recognize what state the list is in and define current accordingly. * Nothing should be done if a delete is not possible. * @pre * @post */ public void delete(){ // delete size--; } /** * Get the value of the current element. If this is not possible, throw an IllegalArgumentException. * @pre the list is not empty * @post * @return value of the current element. */ public char get(){ return getItem(cur); } /** * Go to the last element of the list. If this is not possible, don't change the cursor. * @pre * @post */ public void goLast(){ while (cur.next != null){ cur = cur.next; } } /** * Advance the cursor to the next element. If this is not possible, don't change the cursor. * @pre * @post */ public void goNext(){ if(cur.next != null){ cur = cur.next;} //else do nothing } /** * Retreat the cursor to the previous element. If this is not possible, don't change the cursor. * @pre * @post */ public void goPrev(){ } /** * Go to top of the list. This is the position before the first element. * @pre * @post */ public void goTop(){ } /** * Go to first element of the list. If this is not possible, don't change the cursor. * @pre * @post */ public void goFirst(){ } /** * Insert the given parameter after the current element. The newly inserted element becomes the current element. * @pre * @post * @param newVal : value to insert after the current element. */ public void insert(char newVal){ cur.setItem(newVal); size++; } /** * Determines if this list is empty. Empty means this list has no elements. * @pre * @post * @return true if the list is empty. */ public boolean isEmpty(){ return head == null; } /** * Determines the size of the list. The size of the list is the number of elements in the list. * @pre * @post * @return size which is the number of elements in the list. */ public int size(){ return size; } public class Node { private char item; private Node next; public Node() { } public Node(char item) { this.item = item; } public Node(char item, Node next) { this.item = item; this.next = next; } public char getItem() { return this.item; } public void setItem(char item) { this.item = item; } public Node getNext() { return this.next; } public void setNext(Node next) { this.next = next; } } } I got the node class alright (well i think it works alright), but is it necessary to even have that class? or can i go about it without even using it (just curious). And for example on the method get() in the list class can i not call that getItem() method from the node class because it's getting an error even though i thought that was the whole point for the node class. bottom line i just wanna make sure im setting up the list right. Thanks for any help guys, im new to linked list's so bear with me!

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  • What You Said: What’s on Your Geeky Christmas List

    - by Jason Fitzpatrick
    Earlier this week we asked you to share what’s on your geeky Christmas list; you responded and we’re back to share your longed for tech goodies. The most requested item was this year’s hot introduction to the project board market: the Raspberry Pi. Dave writes: A Rapsberry Pi to tinker with, especially to see if I can get it up and running with OpenElec/Raspbmc and a torrent client for a low power media centre/htpc We just finished setting up a batch of new 512MB Raspberry Pi systems running the newest release of Rasbmbc and can’t recommend it enough–new refinements in Raspbmc and the extra 256MB of RAM really improve the media center experience. All John wants is a real keyboard so he can escape the torture of using a touch screen: How to Factory Reset Your Android Phone or Tablet When It Won’t Boot Our Geek Trivia App for Windows 8 is Now Available Everywhere How To Boot Your Android Phone or Tablet Into Safe Mode

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  • IDC's Sally Hudson on Securing Mobile Access

    - by Naresh Persaud
    After the launch of Identity Management 11g R2, Oracle Magazine writer David Baum sat down with Sally Hudson, research director of security products at International Data Corporation (IDC) to get her perspective on securing mobile access.  Below is an excerpt from the interview. The complete article can be found here. "We’re seeing a much more diverse landscape of devices, computing habits, and access methods from outside of the corporate network. This trend necessitates a total security picture with different layers and end-point controls. It used to be just about keeping people out. Now, you have to let people in. Most organizations are looking toward multifaceted authentication—beyond the password—by using biometrics, soft tokens, and so forth to do this securely. Corporate IT strategies have evolved beyond just identity and access management to encompass a layered security approach that extends from the end point to the data center. It involves multiple technologies and touch points and coordination, with different layers of security from the internals of the database to the edge of the network." ( Sally Hudson, Oracle Mag Sept/Oct 2012) As the landscape changes you can find out how to adapt by reading Oracle's strategy paper on providing identity services at Internet scale. 

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