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• books on web server technology

  - by tushar

  i need to understand the web server technologies as to how are the packets recieved how does it respond and understand httpd.conf files and also get to undertand what terms like proxy or reverse proxy actually mean. but i could not find any resources so please help me and suggest some ebook or web site and by server i dont mean a specific one (apache or nginx..) in short a book on understanding the basics about a web server i already asked this on stackoverflow and webmasters in a nutshell was the answer i got and they said its better if i ask it here so please help me out

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• proper definition of software

  - by studiohack23

  I sometimes see web based applications (eg Avairy, Google Docs) labeled as "software". Is this the true meaning of software? Isn't it supposed to mean applications that run natively on an OS, such as Photoshop or Outlook? Or does it mean ALL applications whether native or web-based?

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• How can I see processes running in Windows 7?

  - by Roman

  I found the following sentence: Many Windows-Users may have wondered about the mDNSResponder.exe process running all the time. It’s Bonjour. Does anybody know how can I see these processes (I do not mean "mDNSResponder.exe". I mean in general.). It should be some analog of "top" command in Linux.

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• What happens when a snapshot is deleted

  - by Ralph Shillington

  I have a tree of snapshots taken about once an hour as I progressed through a rather tricky server setup. Now that I'm done, I would like to get rid of the snapshots, but I gather that these are actually differencing drives. If that's the case, does it not mean that deleting a snapshot will in fact revert me back to a previous point in time. Or does it mean that deleting a snapshot merges the changed bits into the parent VHD.

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• How Spanning Tree Protocol detects Loops

  - by AMIT

  For last few days I've been reading about Spanning Tree Protocol ,L2 protocol and understood how it prevents loop in network ,various steps in STP but one thing i wanted to know how STP actually detects the loops in network so that it can prevent it.Somewhere I read STP uses BPDU as probe and detects loops I mean how it happen is when switch send a BPDU with Destination Address as multicast and receive same BPDU again mean there is loop in network . But is it how STP detects loops in network?

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• Are there any good and lightweight LDAP querying tools?

  - by spinodal

  As developers we sometimes need querying LDAP. Do you know useful tools for this task? edit: I don't mean in code, I mean utility/tool (command-line or gui, mostly gui) for just to look/confirm data, or if possible to alter...

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• Vim: how to undo a regex with a new regex?

  - by Victor Tihomirov

  my I have here a text that has been encrypted in Vi this way: 1,$s/\(.\)\1/&&/g 1,$s/\(.\)\(.\)\2\2\2/\2\2\2\1\2/g 1,$s/\(.\)\(.\)\(.\)\(.\)/\3\1\4\2/g 1,$s/\(...\)\(...\)/\2\1/g The task is to write a new regex for each regex in order to undo the the changes, so-called decrypting of the text. I figured out how to undo the last 2 changes: :1,$s/\(...\)\(...\)/\2\1/g :1,$s/\(.\)\(.\)\(.\)\(.\)/\2\4\1\3/g I'd like you to explain me what do the first two regex do. What does \1 or \2\2\2 mean before the forward slash? I assume that after the slash they change place (but wouldn't it be enough to just write \2\1 instead of \2\2\2\1\2(what does it mean?)? I just don't get it). And what does & or && mean? Thank you

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• address representation in ada

  - by maddy

  Hi all, I have pasted a code below which is in ada language.I need some clarification on some implementations. C : character; Char : character; type Myarr_Type is array (character range 'A'..'K') of character; Myarr : Myarr_Type := ('A','B','C','D','E','F','G','H','I','J','K'); Next_Address := Myarr'address Last_Address := Next_Address + Storage_Offset'(40); my_func(int P1,int P2) { return P2 + Storage_Offset'(4); } Last_Address := Next_Address + Storage_Offset'(4); Now my doubt is 1)what does P2 + Storage_Offset'(4) actually mean.Does that mean that its returning the address of the next element in the array which is 'B'.Storage_Offset'(4) in ada --does this mean 4 bits or 4 bytes of memory. 2) If i assume that Last_Address points to last element of the array which is 'K',how does the arithmentic Storage_Offset'(40) satisfies the actual implementation? Please get back to me if u need any more clarifications. Thanks Maddy

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• Success verification of mail() function PHP

  - by Jared

  Hi Is it possible to check if the php can get some kind of a ping/flag back from exchange mail server to say "yes, email has been sent off to the intended recipient"? According to the PHP manual, the return of mail() boolean could mean; "It is important to note that just because the mail was accepted for delivery, it does NOT mean the mail will actually reach the intended destination." Does this mean, PHP can return success but actually there could be a problem on the mail server that php wouldn't know about it? and in this case no email has been sent and the user is none the wiser? TIA Jared

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• New instruction sets in CPU

  - by Tomek Tarczynski

  Every new generation of CPU introduces some sets of new instruction, ie.: MMX,3DNOW,SSE and so on. I've got few general questions about them: 1) If some program uses for example SSE instruction can it be run on CPU that doesn't support SSE? 2) If yes , does it mean that those instuction will be changed to some greater number of simpler instuctions? 3) If not, does it mean that the real perfomance impact of such new instructions will be after few years when most CPU will support such technology (so there won't be any incompatibilities)? 4) When I compile a C++ program with optimizations does it mean that it'll use some of this new instructions? (I know that it depends on many factors, especcialy on the code, but I want some general answer) Or are they reserved mostly for programs written in asm?

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• Changing ylim (axis limits) drops data falling outside range. How can this be prevented?

  - by Alex Holcombe

  df <- data.frame(age=c(10,10,20,20,25,25,25),veg=c(0,1,0,1,1,0,1)) g=ggplot(data=df,aes(x=age,y=veg)) g=g+stat_summary(fun.y=mean,geom="point") Points reflect mean of veg at each age, which is what I expected and want to preserve after changing axis limits with the command below. g=g+ylim(0.2,1) Changing axis limits with the above command unfortunately causes veg==0 subset to be dropped from the data, yielding "Warning message: Removed 4 rows containing missing values (stat_summary)" This is bad because now the data plot (stat_summary mean) omits the veg==0 points. How can this be prevented? I simply want to avoid showing the empty part of the plot- the ordinate from 0 to .2, but not drop the associated data from the stat_summary calculation.

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• SendMessage videocapture consts

  - by Rita

  Hello, I am using a code sample to connect to a webcam, and don't really understand the meaning of the variables passed to the SendMessage method. SendMessage(DeviceHandle, WM_CAP_SET_SCALE, -1, 0) SendMessage(DeviceHandle, WM_CAP_SET_PREVIEW, -1, 0) What does the -1 mean? To scale/preview or not to scale/preview? I'd prefer that zero/one would be used, zero meaning false, and have no idea what the -1 means. SendMessage(DeviceHandle, WM_CAP_EDIT_COPY, 0, 0); What does the zero mean in this case? Or does this message is simply void and the zero has no meaning, similar to the last zero argument? Btw, what DOES the last zero argument mean? Thank you very much in advance :)

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• Distributing a function over a single dimension of an array in MATLAB?

  - by Alex Feinman

  I often find myself wanting to collapse an n-dimensional matrix across one dimension, and can't figure out if there is a concise incantation I can use to do this. For example, when parsing an image, I often want to do something like this. (Note! Illustrative example only. I know about rgb2gray for this specific case.) img = imread('whatever.jpg'); s = size(img); for i=1:s(1) for j=1:s(2) bw_img = mean(img(i,j,:)); end end I would love to express this as something like: bw = on(color, 3, @mean); or bw(:,:,1) = mean(color); Is there a short way to do this?

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• Ruby function similar to parse_str in php?

  - by jolierouge

  Hi, I need to parse a string like this: a[metadata][][name]=dont|do|this&a[name]=Hello World&a[metadata][][value]=i|really|mean it CGI::parse gives me this: {"a[name]"=["Hello World"], "a[metadata][][name]"=["dont|do|this"], "a[metadata][][value]"=["i|really|mean it"]} I would like something like what PHP does with parse_str, which when given the same string does this: Array ( [a] => Array ( [metadata] => Array ( [0] => Array ( [name] => dont|do|this ) [1] => Array ( [value] => i|really|mean it ) ) [name] => Hello World )) Any help would be awesome. Thanks!

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• Big-O for Eight Year Olds?

  - by Jason Baker

  I'm asking more about what this means to my code. I understand the concepts mathematically, I just have a hard time wrapping my head around what they mean conceptually. For example, if one were to perform an O(1) operation on a data structure, I understand that the amount of operations it has to perform won't grow because there are more items. And an O(n) operation would mean that you would perform a set of operations on each element. Could somebody fill in the blanks here? Like what exactly would an O(n^2) operation do? And what the heck does it mean if an operation is O(n log(n))? And does somebody have to smoke crack to write an O(x!)?

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• Real pagination vs Next and Previous buttons

  - by Pablo

  By real pagination i mean something like this when in page 3: <<Previous 1 | 2 | {3} | 4 | 5 |...| 15 | Next>> By Next and Previous buttons i mean something like this when in page 3: <<previous Next>> Performance wise im sure the Previous and Next Buttons are better since unlike the real pagination it doesn't require over-querying the database. By over-querying the database i mean getting more information from the database than what you will need to display on the page. My theory is that the Previous and Next Buttons can drastically increase a site performance as it only requires the exact information you will need to display on a page, please correct me if im wrong on this. so, do users really have preference when it comes to this two options? is it just a Developer preference and its convenience? Which one do you prefer? why? *Note: Previous and Next Buttons are usually labeled Newer and older.

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• subplot matplotlib wrong syntax

  - by madptr

  I am using matplotlib to subplot in a loop. For instance, i would like to subplot 49 data sets, and from the doc, i implemented it this way; import numpy as np import matplotlib.pyplot as plt X1=list(range(0,10000,1)) X1 = [ x/float(10) for x in X1 ] nb_mix = 2 parameters = [] for i in range(49): param = [] Y = [0] * len(X1) for j in range(nb_mix): mean = 5* (1 + (np.random.rand() * 2 - 1 ) * 0.5 ) var = 10* (1 + np.random.rand() * 2 - 1 ) scale = 5* ( 1 + (np.random.rand() * 2 - 1) * 0.5 ) Y = [ Y[k] + scale * np.exp(-((X1[k] - mean)/float(var))**2) for k in range(len(X1)) ] param = param + [[mean, var, scale]] ax = plt.subplot(7, 7, i + 1) ax.plot(X1, Y) parameters = parameters + [param] ax.show() However, i have an index out of range error from i=0 onwards. Where can i do better to have it works ? Thanks

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• For each level of factor aggregate values over all levels except the current one (in R)

  - by Andrey Chetverikov

  For each level of factor I need to extract values aggregated over all subsets of data.frame except the current one. For example, there is a several subjects doing a reaction time task during several days, and I need to compute mean reaction time for all subjects and all days, but not including the subject for whom the mean is computed. Currently, I do it like this: library(lme4) ddply(sleepstudy, .(Subject, Days), summarise , avg_rt=mean(sleepstudy[sleepstudy$Subject!=Subject&sleepstudy$Days==Days,"Reaction"]), .progress="text") It works fine for small data sets, but for large ones it can be very slow. Is there a way to do it faster?

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• undo or reverse argsort(), python

  - by Vincent

  Given an array 'a' I would like to sort the array by columns "a.sort(axis=0)" do some stuff to the array and then undo the sort. By that I don't mean re sort but basically reversing how each element was moved. I assume argsort() is what I need but it is not clear to me how to sort an array with the results of argsort() or more importantly apply the reverse/inverse of argsort() Here is a little more detail I have an array a, shape(a) = rXc I need to sort each column aargsort = a.argsort(axis=0) # May use this later aSort = a.sort(axis=0) now average each row aSortRM = asort.mean(axis=1) now replace each col in a row with the row mean. is there a better way than this aWithMeans = ones_like(a) for ind in range(r) # r = number of rows aWithMeans[ind]* aSortRM[ind] Now I need to undo the sort I did in the first step. ????

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• Programming message boards [closed]

  - by Slayer0248

  I'm not at all meaning to seem rude or arrogant or something like that to everyone here, but why must we all be so mean when trying to answer each other's questions? I mean people have the right to pick up a skill such as programming at any point in time. It's not like we aren't encouraged to ask each other for help, but alot of people who are doing the answering seem to generally say "this is simple. why aren't you getting this?". I mean some of it may be, but isn't it really kind of an indicator that we should make the documentations for these things a little more extensive?

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• living column in instruments

  - by dubbeat

  In the context of allocations what exactly does the living column mean? Does it mean the number of times an object was created or does it mean how many instances of an object there is? I ask because I'm testing going in and out of a view. When I enter the view I create a class "myClass". When I exit the view I nil "myClass" and release it. If I go in and out of the view 6 times for example the living column in instruments for "myClass" says 6. Is this normal or is it not being released properly?

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• How do you portray to non programmers what programming involves?

  - by JD Isaacks

  I get casually asked a lot to take a couple days to teach someone how to program. Most people really think they can learn what I know in a few days. When I tell them I have been doing this for many years and I can't teach them to be a programmer in a few days, they look at me like I am being a jerk and just don't want to help them. I think this is because when I say I am a programmer, or I programmed this. I truly think most people do not realize that I mean I wrote the code that makes it up. I think that they think I mean I configured it, like when you say, "I programmed my VCR." Does anyone else think this? Whats your experience?

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• gpgpu vs. physX for physics simulation

  - by notabene

  Hello First theoretical question. What is better (faster)? Develop your own gpgpu techniques for physics simulation (cloth, fluids, colisions...) or to use PhysX? (If i say develop i mean implement existing algorithms like navier-strokes...) I don't care about what will take more time to develop. What will be faster for end user? As i understand that physx are accelerated through PPU units in gpu, does it mean that physical simulation can run in paralel with rastarization? Are PPUs different units than unified shader units used as vertex/geometry/pixel/gpgpu shader units? And little non-theoretical question: Is physx able to do sofisticated simulation equal to lets say Autodesk's Maya fluid solver? Are there any c++ gpu accelerated physics frameworks to try? (I am interested in both physx and gpgpu, commercial engines are ok too).

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• What are the most common schools of knowledge prevalent in 'great' programmers?

  - by DaveDev

  I asked this question on StackOverflow but it got shot down fairly quickly. It was suggested that I ask it here, so I've copied it from there. Hope that's ok: The question: I think that the 'great' programmers become so mostly from being exposed to and interested in programming from early ages, as well as huge amounts of dedication. Unfortunately I only discovered programming at a later age, and I sometimes feel frustrated with the difficulties I experience in trying to grok some of the more fundamental concepts the 'greats' seem to take for granted.. So my question is in relationt to that, if a 'great' programmer (i.e. top 10%) had to distill his or her knowledge into a few recommendations / books / concepts / suggestions / lessons, what would they be? What does a programmer who's willing to learn need to do to get on the right track towards becoming great? And to be more specific, I don't mean 'what does that person need to do', because the answer is almost invariably, 'practice!'. What I mean is, what does the programmer need to know?

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• Expected sprint completion rate and load in scrum?

  - by bjarkef

  Recently at work there have been increased focus on completion rate and load on the developers in our sprints. With completion rate I mean, if we plan 20 user stories for a sprint, what percentage of these user stories are closed at the end of the sprint. And with load I mean, if we have a sprint with 3 developers of 60 hours each, i.e. 180 hours for the sprint, how many hours worth of user stories do we schedule for the sprint. So I am really interested in others experience with this, I guess this is something everybody working with scrum deals with. My question is, what completion rate and load are expected/usual, and how are your team doing with respect to these parameters?

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