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  • Using foldr to append two lists together (Haskell)

    - by Luke Murphy
    I have been given the following question as part of a college assignment. Due to the module being very short, we are using only a subset of Haskell, without any of the syntactic sugar or idiomatic shortcuts....I must write: append xs ys : The list formed by joining the lists xs and ys, in that order append (5:8:3:[]) (4:7:[]) => 5:8:3:4:7:[] I understand the concept of how foldr works, but I am only starting off in Functional programming. I managed to write the following working solution (hidden for the benefit of others in my class...) : However, I just can't for the life of me, explain what the hell is going on!? I wrote it by just fiddling around in the interpreter, for example, the following line : foldr (\x -> \y -> x:y) [] (2:3:4:[]) which returned [2:3:4] , which led me to try, foldr (\x -> \y -> x:y) (2:3:4:[]) (5:6:7:[]) which returned [5,6,7,2,3,4] so I worked it out from there. I came to the correct solution through guess work and a bit of luck... I am working from the following definition of foldr: foldr = \f -> \s -> \xs -> if null xs then s else f (head xs) (foldr f s (tail xs) ) Can someone baby step me through my correct solution? I can't seem to get it....I already have scoured the web, and also read a bunch of SE threads, such as How foldr works

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  • A tale of two viewports &#8212; part one

    Back in November I started complicated research into measuring the widths and heights of variousinteresting elements in mobile browsers. This research kept me occupied for months and months; and frankly I becamea bit afraid of it because the subject is so complicated.Besides, when I re-did some tests in MarchI pretty quickly figured out I’d made some nasty mistakes in my original tests. Back to thedrawing board.However, after a review round by some browser vendors and some rewriting it’s done now.Today...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Rejoining two partitions

    - by Alex
    I was courious about Ubuntu so I decided I would give it a chance, therefore I installed it on a parition on my harddrive. Now a couple of months later I haven't used windows once so i decided to go with ubuntu only. I deleted my windows partition with GParted and thought that it was all good. BUT the now formated diskspace that used to be home to windows is now only a formated partition. How do I connect it to the partition where my ubuntu installation lays iow go back to having a non parted hard drive?

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  • Two Home and Boot partitions after installing Ubuntu 14.04 and Downgrading to Ubuntu 12.04

    - by Jatttt
    I have Ubuntu 12.04 LTS and I am experiencing some problems. I didn't have Ubuntu 12.04 on a drive to install it but I did have Ubuntu 14.04. So I installed it and downloaded Ubuntu 12.04 using Ubuntu 14. Now, I have 2 home partitions and 2 boot partitions. One home and boot is mounted at /media and the other one is /home and /boot. I cannot get rid of /media/HOME and /media/BOOT even using Gparted. How do I get remove them?

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  • How to map TFS to two local directories

    - by Buh Buh
    I am working with a web application, using TFS. Every time I build the site it takes an unproductivly long time to start up again. I would like to have a second mapping of the site on my c drive, where I would only get latest and build once a day, so this version would always be fast. This would be like a "readonly" directory as I wouldn't personally make any edits to it. Please let me know if this possible, or if you have any alternative.

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  • Two users sharing the same computer

    - by Pitto
    I need to share my pc with a friend of mine living in India. His pc is a p4 and he needs a bit of horsepower for calculation. Since I have an i5 I thought to let him vnc and use it but this would not allow me to use the computer at the same time. Is there a way to use the computer at the same time with different users? I've read Xorg is able to do this but I am not sure is the best solution nor I can implement it. We have Ubuntu 12.04 64bit on the i5 side and Ubuntu 12.04 32bit on the p4 side. Thank you for your kind help.

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  • backlinks: Two domains with same IP

    - by Michal
    I run several different web pages on different servers (with different IP addresses). These pages are linking to each other in order to boost number of back links pointing to my pages. I would like to move all those projects to a single virtual host (with a single IP address). My question is, how google handles links within different domain names but same ip address. Is there some penalization for it? Could this lead to lower page rank?

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  • Two different domain for specific languages pointing to one site

    - by user25599
    I developing a client's blog and he needs it to be bilingual (english and spanish). Now what he wants is that users can get to the content based on the domain e.g. Jhon enters www.domain.com and he gets the english version and Juan enters www.elsenordominio.com to get the spanish version. All content will be validated by php so the users and search engines only reads the domain related language. What do i need to use header re-direct or 301? is it bad for seo? will google will google penalize me? I hope you guys can help me and forgive me if my english is not good.

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  • What is the preferred/recommend way of running two version of ubuntu side by side

    - by GreyGeek
    I am running 14.04, but I need to run some corporate software/scripts that have been specifically designed for 12.04. I am aware of virtual box/vmware for full virtualization but I am looking for something more lightweight (on my windows machine both come at a significant cost in battery life) closer to os virtualization level. Ideally, I would like something like windows 7/8 compatibility mode: the ability to run a program as if I were on 12.04. Does Ubuntu/Linux have such mechanism? What is the preferred way of running programs/scripts designed for an older version of Ubuntu?

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  • .htaccess two different rules but only one per time

    - by dragon112
    I'm rather new to the whole .htaccess thing and I'm using the following right now to use 'pretty url's': <IfModule mod_rewrite.c> RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php?path=$1 [NS,L] </IfModule> Now i found my website a bit slow and decided to start gzipping my CSS files thru a php script I found somewhere on the web (the website). For this to work I need to rewrite the url to open the correct php file. That would look something like this: RewriteRule ^(.*).css$ /csszip.php?file=$1.css [L] But I only want the first to happen when the second doesn't and vice versa. In other words i'd like something like this: <IfModule mod_rewrite.c> RewriteEngine On if request doesn't contain .css do RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ index.php?path=$1 [NS,L] else do RewriteRule ^(.*).css$ /csszip.php?file=$1.css [L] </IfModule> Can anyone help me with the proper code or a place where i can find a way to use some kind of conditional statement in htaccess files? Thanks in Advance!:)

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  • How to join two command output

    - by UAdapter
    for example I have command that shows how much space folder takes du folder | sort -n it works great, however I would like to have human readable form du -h folder however if I do that than I cannot sort it as numeric. How to join "du folder" and "du -h folder" to see output sorted as "du folder", but with first column from "du -h folder" P.S. this is just an example. this technique might be very useful for me (if its possible)

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  • Problem inserting in two different tables [closed]

    - by imvarunkmr
    I have written an insert statement which inserts a record into Table1. Table1 has a column "ID" which is an auto_increment(Identity) primary key. How can I fetch the newly generated "ID" and as I need to Insert this value as foreign key in Table2? Note : I have written INSERT statement in a stored procedure and I am calling this procedure using C# Alternative suggestions to link both tables are also welcomed :)

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  • 3Ware 9650SE RAID-6, two degraded drives, one ECC, rebuild stuck

    - by cswingle
    This morning I came in the office to discover that two of the drives on a RAID-6, 3ware 9650SE controller were marked as degraded and it was rebuilding the array. After getting to about 4%, it got ECC errors on a third drive (this may have happened when I attempted to access the filesystem on this RAID and got I/O errors from the controller). Now I'm in this state: > /c2/u1 show Unit UnitType Status %RCmpl %V/I/M Port Stripe Size(GB) ------------------------------------------------------------------------ u1 RAID-6 REBUILDING 4%(A) - - 64K 7450.5 u1-0 DISK OK - - p5 - 931.312 u1-1 DISK OK - - p2 - 931.312 u1-2 DISK OK - - p1 - 931.312 u1-3 DISK OK - - p4 - 931.312 u1-4 DISK OK - - p11 - 931.312 u1-5 DISK DEGRADED - - p6 - 931.312 u1-6 DISK OK - - p7 - 931.312 u1-7 DISK DEGRADED - - p3 - 931.312 u1-8 DISK WARNING - - p9 - 931.312 u1-9 DISK OK - - p10 - 931.312 u1/v0 Volume - - - - - 7450.5 Examining the SMART data on the three drives in question, the two that are DEGRADED are in good shape (PASSED without any Current_Pending_Sector or Offline_Uncorrectable errors), but the drive listed as WARNING has 24 uncorrectable sectors. And, the "rebuild" has been stuck at 4% for ten hours now. So: How do I get it to start actually rebuilding? This particular controller doesn't appear to support /c2/u1 resume rebuild, and the only rebuild command that appears to be an option is one that wants to know what disk to add (/c2/u1 start rebuild disk=<p:-p...> [ignoreECC] according to the help). I have two hot spares in the server, and I'm happy to engage them, but I don't understand what it would do with that information in the current state it's in. Can I pull out the drive that is demonstrably failing (the WARNING drive), when I have two DEGRADED drives in a RAID-6? It seems to me that the best scenario would be for me to pull the WARNING drive and tell it to use one of my hot spares in the rebuild. But won't I kill the thing by pulling a "good" drive in a RAID-6 with two DEGRADED drives? Finally, I've seen reference in other posts to a bad bug in this controller that causes good drives to be marked as bad and that upgrading the firmware may help. Is flashing the firmware a risky operation given the situation? Is it likely to help or hurt wrt the rebuilding-but-stuck-at-4% RAID? Am I experiencing this bug in action? Advice outside the spiritual would be much appreciated. Thanks.

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  • How to connect SAN from CentOS through two iSCSI Targets

    - by garconcn
    I had asked the similar question before. This time I want to use subnet for two iSCSI Targets, hence I start a new question. I have an old Promise VTrak M500i SAN Server. It comes with 2 iSCSI ports. I want to connect to two LUNs on the SAN server through two separate Targets from CentOS 5.7 64bits server. My network setup is as follows: CentOS server: Management network - 192.168.1.1 Storage network 1 - 192.168.5.2 Storage network 2 - 192.168.6.2 Promise SAN server: Management network - 192.168.1.2 iSCSI Port 1 - 192.168.5.1 iSCSI Port 2 - 192.168.6.1 I have two Logical Drives on this SAN and they are mapped as follows: Index Initiator Name LUN Mapping 0 iqn.2011-11:backup (LD0,0) 1 iqn.2011-11:template (LD1,1) Basically, I want the traffic to iqn.2011-11:backup LUN 0 through 192.168.5.1 network the traffic to iqn.2011-11:template LUN 1 through 192.168.6.1 network I don't use MPIO, just want to separate the traffic to avoid traffic jam. How do I achieve this? I am new to SAN stuff, please explain as much detail as you can. Thank you. The following are what I am doing now. After mapping the LUN to my pre-defined Initiators, the CentOS server can discover both Targets. [root@centos ~]# iscsiadm -m discovery -t sendtargets -p 192.168.5.1 192.168.5.1:3260,1 iscsi-1 192.168.6.1:3260,2 iscsi-1 [root@centos ~]# iscsiadm -m discovery -t sendtargets -p 192.168.6.1 192.168.6.1:3260,2 iscsi-1 192.168.5.1:3260,1 iscsi-1 [root@centos ~]# /etc/init.d/iscsi start iscsid is stopped Starting iSCSI daemon: [ OK ] [ OK ] Setting up iSCSI targets: Logging in to [iface: default, target: iscsi-1, portal: 192.168.6.1,3260] Logging in to [iface: default, target: iscsi-1, portal: 192.168.5.1,3260] Login to [iface: default, target: iscsi-1, portal: 192.168.6.1,3260] successful. Login to [iface: default, target: iscsi-1, portal: 192.168.5.1,3260] successful. [ OK ] [root@centos ~]# iscsiadm -m session tcp: [1] 192.168.6.1:3260,2 iscsi-1 tcp: [2] 192.168.5.1:3260,1 iscsi-1 When I check the LUN mapping on the SAN server for the two Logical Drives, both LUNs are connected through Port0-192.168.5.2 with the Initiator defined in CentOS. Assigned Initiator List: Initiator Name Alias IP Address LUN iqn.2011-11.centos centos.mydomain.com Port0-192.168.5.2 0 Initiator Name Alias IP Address LUN iqn.2011-11.centos centos.mydomain.com Port1-192.168.5.2 1 I assume the following is what I want: Initiator Name Alias IP Address LUN iqn.2011-11.backup centos.mydomain.com Port0-192.168.5.2 0 Initiator Name Alias IP Address LUN iqn.2011-11.template centos.mydomain.com Port0-192.168.6.2 1

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  • Formatting a a memory stick with two partitions?

    - by Marius
    I have a 16GB memorystick which used to have a Linux partition. It therefore has two partitions; 2GB FAT32 and 14GB linux boot drive. The linux part stopped working, so I decided to reinstall it. But windows can't see that partition. I tried formatting the whole disk, but I can only format one partition (the FAT32). There seems to be no way to combine the two partitions into one big one, and there seems to be no way for windows to partition the large part of the memorystick to but Linux on it. In the windows partition manager, windows sees the large unused partition, and it let me delete it. But once I have deleted it, I'm not allowed to format it. Also I cannot delete or resize the small partition. So, to summarize: I have a memorystick with two partitons. Windows only sees one of them, and won't let me use the other one. I would like to combine the two partitions so I can install Linux on the memory stick again.

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  • Formatting a memory stick with two partitions?

    - by Marius
    I have a 16GB memorystick which used to have a Linux partition. It therefore has two partitions; 2GB FAT32 and 14GB linux boot drive. The linux part stopped working, so I decided to reinstall it. But windows can't see that partition. I tried formatting the whole disk, but I can only format one partition (the FAT32). There seems to be no way to combine the two partitions into one big one, and there seems to be no way for windows to partition the large part of the memorystick to but Linux on it. In the windows partition manager, windows sees the large unused partition, and it let me delete it. But once I have deleted it, I'm not allowed to format it. Also I cannot delete or resize the small partition. So, to summarize: I have a memorystick with two partitons. Windows only sees one of them, and won't let me use the other one. I would like to combine the two partitions so I can install Linux on the memory stick again.

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  • Symantec Antivirus Corporate -- two problems

    - by Alex C.
    We have a Windows network with a domain and about 50 clients. A few months ago, we installed Symantec Antivirus, Corporate Edition ver. 10.1.8.8000. There are two problems. The larger problem is that the software isn't very good at stopping viruses. In the last month, four different machines have become infected with those viruses that masquerade as antivirus software. Two machines I was able to clean with MalWareBytes. The other two were hopeless, and I had to reinstall Windows. Is there something I can do to make the Symantec product more effective? As far as I can tell, it successfully updates definitions nightly and pushes the definitions to the clients. The smaller problem is that the Symantec client applications sometimes initiate scans at random (and inappropriate) times. One of my co-workers complained to me yesterday that her computer was running very slow. I looked at the scan history and found that Symantec had scanned the computer three times during the past two days, and each time during the workday. No threats were found. Not sure why it's doing this, but I'd like it to stop. Any help would be appreciated. Thanks.

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