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  • Solving the water jug problem

    - by Amit
    While reading through some lecture notes on preliminary number theory, I came across the solution to water jug problem (with two jugs) which is summed as thus: Using the property of the G.C.D of two numbers that GCD(a,b) is the smallest possible linear combination of a and b, and hence a certain quantity Q is only measurable by the 2 jugs, iff Q is a n*GCD(a,b), since Q=sA + tB, where: n = a positive integer A = capacity of jug A B= capacity of jug B And, then the method to the solution is discussed Another model of the solution is to model the various states as a state-space search problem as often resorted to in Artificial Intelligence. My question is: What other known methods exist which models the solution, and how? Google didn't throw up much.

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  • Is it a solvable problem to generate a regular expression that matches some input set?

    - by Roman
    I provide some input set which contains known separated number of text blocks. I want to make a program that automatically generate 1 or more regular expressions each of which matches every text block in the input set. I see some relatively easy ways to implement a brute-force search. But I'm not an expert in compilers theory. That's why I'm curious: 1) is this problem solvable? or there are some principle impossibility to make such algorithm? 2) is it possible to achieve polynomial complexity for this algorithm and avoid brute forcing?

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  • Jquery convert integer to string and back

    - by Richbyte
    These are the logical steps which i need render with jquery: var x is a 2 digit number(integer) derived from an input.value(); If var x is not 33 or 44 Convert this 2 digit number to string; split the string in 2 parts as number; Add these 2 values; Return var x value as this value. Else Return var x value literally as 33 or 44 whatever is the case. Thanks!

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  • Normalized Device Coordinates to window coordinates

    - by okoman
    I just read some stuff about the theory behind 3d graphics. As I understand it, normalized device coordinates (NDC) are coordinates that describe a point in the interval from -1 to 1 on both the horizontal and vertical axis. On the other hand window coordinates describe a point somewhere between (0,0) and (width,height) of the window. So my formula to convert a point from the NDC coordinate system to the window system would be xwin = width + xndc * 0.5 * width ywin = height + ynfv * 0.5 * height The problem now is that in the OpenGL documentation for glViewport there is an other formula: xwin = ( xndc + 1 ) * width * 0.5 + x ywin = ( yndc + 1 ) * height * 0.5 + y Now I'm wondering what I am getting wrong. Especially I'm wondering what the additional "x" and "y" mean. Hope the question isn't too "not programming related", but I thought somehow it is related to graphics programming.

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  • Indefinite loops where the first time is different

    - by George T
    This isn't a serious problem or anything someone has asked me to do, just a seemingly simple thing that I came up with as a mental exercise but has stumped me and which I feel that I should know the answer to already. There may be a duplicate but I didn't manage to find one. Suppose that someone asked you to write a piece of code that asks the user to enter a number and, every time the number they entered is not zero, says "Error" and asks again. When they enter zero it stops. In other words, the code keeps asking for a number and repeats until zero is entered. In each iteration except the first one it also prints "Error". The simplest way I can think of to do that would be something like the folloing pseudocode: int number = 0; do { if(number != 0) { print("Error"); } print("Enter number"); number = getInput(); }while(number != 0); While that does what it's supposed to, I personally don't like that there's repeating code (you test number != 0 twice) -something that should generally be avoided. One way to avoid this would be something like this: int number = 0; while(true) { print("Enter number"); number = getInput(); if(number == 0) { break; } else { print("Error"); } } But what I don't like in this one is "while(true)", another thing to avoid. The only other way I can think of includes one more thing to avoid: labels and gotos: int number = 0; goto question; error: print("Error"); question: print("Enter number"); number = getInput(); if(number != 0) { goto error; } Another solution would be to have an extra variable to test whether you should say "Error" or not but this is wasted memory. Is there a way to do this without doing something that's generally thought of as a bad practice (repeating code, a theoretically endless loop or the use of goto)? I understand that something like this would never be complex enough that the first way would be a problem (you'd generally call a function to validate input) but I'm curious to know if there's a way I haven't thought of.

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  • How do I configure the number of worker threads used by SqlServer 2005 Agent

    - by Decker
    How can I increase the limit of worker threads from the default 10 for SQL Server 2005 SqlAgent? I have 9 jobs that run almost continuously and that leaves only one available thread for the rest of the scheduled jobs. Oftentimes, when no thread is available, I will see the jobs in "Waiting for worker thread" state. I'd like to increase the number to about 12 (which should do the trick for me). Any idea where this is set?

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  • Number of Splitters on Coaxial Connection and Cable Internet Quality of Service

    - by Matthew Ruston
    Does running multiple coaxial splitters on a single coaxial cable line effect quality of service for cable internet connections? Suppose there are 2-4 splitters between the cable line coming into a building before the connection to a cable modem, does this negatively effect the latency, throughput, etc of a cable internet connection by any measurable amount? Is there a maximum number of times that a coaxial cable can be split into multiple internet and TV connections before QoS suffers?

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  • how to change SharePoint web application port number?

    - by George2
    Hello everyone, I am using SharePoint Server 2007 Enterprise with Windows Server 2008 Enterprise, and I am using publishing portal template. I have created a web application for intranet zone. I want to know how to change the port number of the web application? Could I change it directly in IIS manager (is this way safe)? thanks in advance, George

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  • Hard disk number in boot.ini?

    - by MA1
    Hi All Need help to remove a confusion. Suppose we have two hard disk. Referring to boot.ini, In case of MULTI and SCSI syntax: which parameter exactly tells us hard disk number? Regards,

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  • Hylafax / Capi4hylafax: faxgetty does not recognize number of lines

    - by Wrikken
    We've got a T.30 card, 30 working lines on it, but for some reason, if I add more then 30 faxes in the queue at any time (and we're busy enough at peak times that this happens a lot), faxgetty sends faxes to non-existent lines and they appear in the error queue as a 'busy' signal on the line, which results in a lot of failed faxes because the counter of max 3 tries increases rapidly. This is using faxgetty (USE_FAXGETTY="y" in /etc/default/hylafax). I've inherited this thing, so I'm not entirely sure how faxgetty is supposed to know the number of lines. However, if I alter the script to faxmodem (USE_FAXGETTY="n" in /etc/default/hylafax and manually enabling 30 modems), this behavior goes away (new faxes 'wait' for a line to be available before trying to send, so each try / fail is a valid one on a working line, majorly descreasing the amount of failed faxes. However, when researching this almost anyone talks about faxgetty being the preferred, more robust, method, and on top of that for some unexplained reason all FIFO's disappeared for some reason after several errorless hours with faxmodem, forcing a hylafax restart using faxgetty until we figured out why this faxmodem solution failed (which is another question, and somewhat out of scope here). Environment: Debian 2.6.26-2-amd64 capi4hylafax 1:01.03.00.99.svn.300-12 hylafax-client 2:4.4.4-10.1 hylafax-server 2:4.4.4-10.1 Config --hfaxd.conf-- LogFacility: daemon ServerTracing: 0x1ff --hyla.conf-- Host: localhost Verbose: No VRes: 196 TimeZone: local DialRules: "/etc/hylafax/dialrules.europe" --/etc/hylafax/config -- InternationalPrefix: 00 LongDistancePrefix: 0 AreaCode: 99999 CountryCode: 31 DialStringRules: "etc/dialrules.europe" ModemGroup: any:faxCAPI SendFaxCmd: "/usr/bin/wrapc2faxsend" --/etc/hylafax/config.faxCAPI -- SpoolDir: /var/spool/hylafax FaxRcvdCmd: /var/spool/hylafax/bin/faxrcvd PollRcvdCmd: /var/spool/hylafax/bin/pollrcvd FaxReceiveUser: uucp FaxReceiveGroup: dialout LogFile: /var/spool/hylafax/log/capi4hylafax #no, checking this log did not yield anything interesting LogTraceLevel: 4 LogFileMode: 0600 ModemGroup: any:faxCAPI #repeats of faxCAPI2 = faxCAPI30, with of course another devicename/local ident: { HylafaxDeviceName: faxCAPI RecvFileMode: 0600 FAXNumber: ****redacted**** LocalIdentifier: ****some-ident-per-device*** MaxConcurrentRecvs: 0 OutgoingController: 1 OutgoingMSN: SuppressMSN: 0 NumberPrefix: NumberPlusReplacer: "00" UseISDNFaxService: 0 RingingDuration: 0 { Controller: 1 AcceptSpeech: 0 UseDDI: 0 DDIOffset: DDILength: 0 IncomingDDIs: IncomingMSNs: AcceptGlobalCall: 1 } } So in short: How does faxgetty determine the number of lines available? (the man page isn't terribly revealing, and I can't find an appropriate setting in hylafax-config. And how can I get a capi4hylafax/hylafax setup which queues more faxes then lines are available correctly without immediately incrementing the fail count? We will not be receiving any faxes on this machine b.t.w. As I said, I've inherited this thing, so if there are important configuration options I'm not including, please let me know.

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  • How to monitor the total number of SQL Server logins

    - by Shiraz Bhaiji
    We have an SQL Server 2005 that is the backend of a web application. The application is partly SharePoint and partly web services accessing the database via Entity Framework. In the performance monitor I am seeing average SQL Logins is ca, 60 per second (max 170), but the average logouts is less than 1. Where can I see the total number of SQL Server logins? Anyone have an idea what could be causing this?

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  • what's the port number of mysql

    - by user28233
    I'm trying to connect mysql with vb.net, I've already downloaded the mysql connector-net. And installed it. But I don't know what is the port number , server address of mysql. Its needed in the connection string. Please help, Server=myServerAddress;Port=1234;Database=myDataBase;Uid=myUsername;Pwd=myPassword;

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  • Removed recipients number limitation still affects on Exchange 2003

    - by gcaracuel
    We have an Exchange 2003 cluster in wich we have limited the number of recipients in the past. We deleted it but it's still affecting our service. I have moved the services to the other node (it's an active/pasive cluster) so i guess i have restarted with this procedure the "Microsoft Exchange Information Store service" as is required to limit it (http://technet.microsoft.com/en-us/library/aa996677(v=exchg.80).aspx). anyone have any idea why the limitation is not deleted?

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  • pg_dump: Error message from server: ERROR: missing chunk number 0 for toast value 43712886 in pg_to

    - by Kirill Novozhilov
    After $ pg_dumpall -U postgres -f /tmp/pgall.sql I see following: pg_dump: SQL command failed pg_dump: Error message from server: ERROR: missing chunk number 0 for toast value 43712886 in pg_toast_16418 pg_dump: The command was: COPY public.page_parts (id, name, filter_id, content, page_id) TO stdout; pg_dumpall: pg_dump failed on database "radiant", exiting I haven't earlier backups. How can I fix it? Thanks in advance.

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  • limit the total number of emails per domain per hour / per day

    - by air
    i have windows 2008 server with Mail Enable Free edition with plesk 9.5. what i want is: to limit each domain with total number of emails per hour / per day to avoid spam. i know its possible in Mail Enable Ent Version which is not free.( i don't want to pay right now) is this possible or i have to use any other script. is this possible in hMail server? Thanks

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  • limit the total number of emails per domain per hour / per day

    - by user20989
    i have windows 2008 server with Mail Enable Free edition with plesk 9.5. what i want is: to limit each domain with total number of emails per hour / per day to avoid spam. i know its possible in Mail Enable Ent Version which is not free.( i don't want to pay right now) is this possible or i have to use any other script. is this possible in hMail server? Thanks

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