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  • Scared of Calculus - Required to pass Differential Calculus as part of my Computer science major

    - by ke3pup
    Hi guys I'm finishing my Computer science degree in university but my fear of maths (lack of background knowledge) made me to leave all my maths units til' the very end which is now. i either take them on and pass or have to give up. I've passed all my programming units easily but knowing my poor maths skills won't do i've been staying clear of the maths units. I have to pass Differential Calculus and Linear Algebra first. With a help of book named "Linear Algebra: A Modern Introduction" i'm finding myself on track and i think i can pass the Linear Algebra unit. But with differential calculus i can't find a book to help me. They're either too advanced or just too simple for what i have to learn. The things i'm required to know for this units are: Set notation, the real number line, Complex numbers in cartesian form. Complex plane, modulus. Complex numbers in polar form. De Moivre’s Theorem. Complex powers and nth roots. Definition of ei? and ez for z complex. Applications to trigonometry. Revision of domain and range of a function Working in R3. Curves and surfaces. Functions of 2 variables. Level curves.Partial derivatives and tangent planes. The derivative as a difference quotient. Geometric significance of the derivative. Discussion of limit. Higher order partial derivatives. Limits of f(x,y). Continuity. Maxima and minima of f(x,y). The chain rule. Implicit differentiation. Directional derivatives and the gradient. Limit laws, l’Hoˆpital’s rule, composition law. Definition of sinh and cosh and their inverses. Taylor polynomials. The remainder term. Taylor series. Is there a book to help me get on track with the above? Being a student i can't buy too many books hence why i'm looking for a book that covers topics I need to know. The University library has a fairly limited collection which i took as loan but didn't find useful as it was too complex.

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  • Having to hit the site login button twice after first turning on computer

    - by John
    Hello, The code below is for a login that I'm using. It works fine, but when I first try logging in after turning on my computer, it only works the second time that I hit the "Login" button. Any idea how I can make it not require hitting the "Login" button twice in this situation? Thanks in advance, John function isLoggedIn() { if (session_is_registered('loginid') && session_is_registered('username')) { return true; // the user is loged in } else { return false; // not logged in } return false; } if (!isLoggedIn()) { if (isset($_POST['cmdlogin'])) { if (checkLogin($_POST['username'], $_POST['password'])) { show_userbox(); } else { echo "Incorrect Login information !"; show_loginform(); } } else { show_loginform(); } } else { show_userbox(); } function show_loginform($disabled = false) { echo '<form name="login-form" id="login-form" method="post" action="./index.php"> <div class="usernameformtext"><label title="Username">Username: </label></div> <div class="usernameformfield"><input tabindex="1" accesskey="u" name="username" type="text" maxlength="30" id="username" /></div> <div class="passwordformtext"><label title="Password">Password: </label></div> <div class="passwordformfield"><input tabindex="2" accesskey="p" name="password" type="password" maxlength="15" id="password" /></div> <div class="registertext"><a href="http://www...com/sandbox/register.php" title="Register">Register</a></div> <div class="lostpasswordtext"><a href="http://www...com/sandbox/lostpassword.php" title="Lost Password">Lost password?</a></div> <p class="loginbutton"><input tabindex="3" accesskey="l" type="submit" name="cmdlogin" value="Login" '; if ($disabled == true) { echo 'disabled="disabled"'; } echo ' /></p></form>'; } EDIT: Here is another function that is used. function isLoggedIn() { if (session_is_registered('loginid') && session_is_registered('username')) { return true; // the user is loged in } else { return false; // not logged in } return false; }

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  • How do you differentiate between "box," "machine," "computer" and whatever else?

    - by Corey
    There seems to be a few terms for referring to a computer, especially in the tech world. Different terms seem to be used based on technical expertise. When talking with people with some technical knowledge, I'll refer to it as a machine. When talking to non-technical people (family, friends) I'll call it a computer. On the rare occasion I'm talking about servers, I might call it a box, but even then I'll probably still call it a machine. Is that just me, or do there exist rules already for what to call a computer?

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  • Do employers hiring for software jobs care about the classes you took in a Computer Science Masters program?

    - by Bob Dole
    I'm torn between two classes right now for next semester (Software Design and Advanced Computer Graphics). I would enjoy Advanced Computer Graphics more, but I feel the software design class would help me when approaching anything I ever build for the rest of my career. I feel though I could just buy the book (I already have both books actually) of the Software Design class and go through it, if I wanted. But think it would be a bit tougher to pick up the Advanced Computer Graphics class on my own. So do employers look at the graduate classes you've taken to decide if you would be a good fit or not? I think, more importantly, what I'm wanting to know is if I wanted to work for a high-end software company like Apple or Google would a company like that be more impressed by someone that took software engineering classes or hardcore CS classes?

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  • How do I make the 'Shut Down the Computer' window be monochrome ?

    - by Agmenor
    When I hit the power button of my computer, a window titled 'Shut Down the Computer' appears. It gives a few options, including shutting down or restarting. This window is different following the context I hit the power button : when logged in and seeing my desktop, it includes colourful icons (red for shutting down, for example). when I am not logged in yet, the icons are monochrome and a little bit more stylized. I clearly prefer the last type of icons : how do I set them as default whatever the context of use of the 'Shut Down the Computer' window ?

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  • How can I copy an XP Mode virtual machine from one computer to another?

    - by Investor5555
    Is it possible to copy an XP Mode Virtual PC image from one computer to a completely different computer (not on the network, not related in any way whatsoever)? I tried this, but it only would seem to work on the same computer: http://www.sevenforums.com/tutorials/21904-virtual-xp-machine-copy.html When I copy it to another computer and modify the settings as described above, the cursor just jumps around all over the screen and never starts.

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  • got VPN l2l connect between a site & HQ but not traffice using ASA5505 on both ends

    - by vinlata
    Hi, Could anyone see what did I do wrong here? this is one configuration of site1 to HQ on ASA5505, I can get connected but seems like no traffic going (allowed) between them, could it be a NAT issue? any helps would much be appreciated Thanks interface Vlan1 nameif inside security-level 100 ip address 172.30.205.1 255.255.255.0 ! interface Vlan2 nameif outside security-level 0 ip address pppoe setroute ! interface Ethernet0/0 switchport access vlan 2 ! interface Ethernet0/1 ! interface Ethernet0/2 shutdown ! interface Ethernet0/3 shutdown ! interface Ethernet0/4 shutdown ! interface Ethernet0/5 shutdown ! interface Ethernet0/6 shutdown ! interface Ethernet0/7 shutdown ! passwd .dIuXDIYzD6RSHz7 encrypted ftp mode passive dns server-group DefaultDNS domain-name errg.net object-group network HQ network-object 172.22.0.0 255.255.0.0 network-object 172.22.0.0 255.255.128.0 network-object 172.22.0.0 255.255.255.128 network-object 172.22.1.0 255.255.255.128 network-object 172.22.1.0 255.255.255.0 access-list inside_access_in extended permit ip any any access-list outside_access_in extended permit icmp any any echo-reply access-list outside_20_cryptomap extended permit ip 172.30.205.0 255.255.255.0 o bject-group HQ access-list inside_nat0_outbound extended permit ip 172.30.205.0 255.255.255.0 o bject-group HQ access-list policy-nat extended permit ip 172.30.205.0 255.255.255.0 172.22.0.0 255.255.0.0 pager lines 24 logging asdm informational mtu inside 1500 mtu outside 1500 icmp unreachable rate-limit 1 burst-size 1 no asdm history enable arp timeout 14400 nat-control global (outside) 1 interface nat (inside) 0 access-list inside_nat0_outbound nat (inside) 1 0.0.0.0 0.0.0.0 static (inside,outside) 172.30.205.0 access-list policy-nat access-group inside_access_in in interface inside access-group outside_access_in in interface outside timeout xlate 3:00:00 timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02 timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00 timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00 timeout uauth 0:05:00 absolute username errgadmin password Os98gTdF8BZ0X2Px encrypted privilege 15 http server enable http 64.42.2.224 255.255.255.240 outside http 172.22.0.0 255.255.0.0 outside no snmp-server location no snmp-server contact snmp-server enable traps snmp authentication linkup linkdown coldstart crypto ipsec transform-set ESP-3DES-SHA esp-3des esp-sha-hmac crypto map outside_map 190 match address outside_20_cryptomap crypto map outside_map 190 set pfs crypto map outside_map 190 set peer 66.7.249.109 crypto map outside_map 190 set transform-set ESP-3DES-SHA crypto map outside_map 190 set phase1-mode aggressive crypto map outside_map interface outside crypto isakmp enable outside crypto isakmp policy 30 authentication pre-share encryption 3des hash sha group 2 lifetime 86400 crypto isakmp policy 65535 authentication pre-share encryption 3des hash sha group 2 lifetime 86400 crypto isakmp nat-traversal 190 crypto isakmp ipsec-over-tcp port 10000 tunnel-group 66.7.249.109 type ipsec-l2l tunnel-group 66.7.249.109 ipsec-attributes pre-shared-key * telnet timeout 5 ssh 172.30.205.0 255.255.255.0 inside ssh 172.22.0.0 255.255.0.0 outside ssh 64.42.2.224 255.255.255.240 outside ssh 172.25.0.0 255.255.128.0 outside ssh timeout 5 console timeout 0 management-access inside vpdn group PPPoEx request dialout pppoe vpdn group PPPoEx localname [email protected] vpdn group PPPoEx ppp authentication pap vpdn username [email protected] password ********* dhcpd address 172.30.205.100-172.30.205.131 inside dhcpd dns 172.22.0.133 68.94.156.1 interface inside dhcpd wins 172.22.0.133 interface inside dhcpd domain errg.net interface inside dhcpd enable inside ! ! class-map inspection_default match default-inspection-traffic ! ! policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect netbios inspect rsh inspect rtsp inspect skinny inspect esmtp inspect sqlnet inspect sunrpc inspect tftp inspect sip inspect xdmcp ! end

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  • Software to draw 3D geometry

    - by ilovekonoka
    Does anyone know any software that can draw 3D geometry like figures usually seen in computer graphics papers and articles(example: http://www.iquilezles.org/www/articles/sphereao/sphereao.htm)? I know it can be done in Inskcape or Illustrator but I'm not sure they're the only choices.

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  • Has anyone "learned how to program in 21 days?"

    - by Sheehan Alam
    I'm not a fan of these learn how to program in X amount of days books. Some even boast, learn how to program in 24 hours. This is a joke and an insult to me as a software engineer who went through a rigorous discipline in computer science and mathematics. So a question to the community, have you benefited from these become a programmer quick books?

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  • P-NP-Problem: What are the most promising methods?

    - by phimuemue
    Hello everybody, I know that P=NP has not been solved up to now, but can anybody tell me something about the following: What are currently the most promising mathematical / computer scientific methods that could be helpful to tackle this problem? Or are there even none such methods known to be potentially helpful up to now? Is there any (free) compendium on this topic where I can find all / most of the research done in this area?

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  • P=NP?-Problem: What are the most promising methods?

    - by phimuemue
    Hello everybody, I know that P=NP has not been solved up to now, but can anybody tell me something about the following: What are currently the most promising mathematical / computer scientific methods that could be helpful to tackle this problem? Or are there even none such methods known to be potentially helpful up to now? Is there any (free) compendium on this topic where I can find all / most of the research done in this area?

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  • Need help fixing a strange path error in bash

    - by Evan
    UPDATE Ok, I found some errors in the path which I think I fixed, but now it's not running in any case - which for some reason I think is a step forward. Thanks for suggesting the following steps, here is their output: user@computer:~$ echo $PATH /usr/share/fsl/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/usr/local/matlab/bin:/usr/local/VoxBo/bin:/usr/local/itt/idl64/bin:/usr/local/afni/bin/:/usr/local/mricron:/usr/lib/voxbo/bin:/home/user/folder:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11/:/usr/games/:/usr/local/matlab/bin:/usr/local/VoxBo/bin/:/usr/local/itt/idl64/bin:/usr/local/afni/bin/:/usr/local/mricron/ user@computer:~$ typeset -p PATH declare -x PATH="/usr/share/fsl/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games:/usr/local/matlab/bin:/usr/local/VoxBo/bin:/usr/local/itt/idl64/bin:/usr/local/afni/bin/:/usr/local/mricron:/usr/lib/voxbo/bin:/home/user/folder:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11/:/usr/games/:/usr/local/matlab/bin:/usr/local/VoxBo/bin/:/usr/local/itt/idl64/bin:/usr/local/afni/bin/:/usr/local/mricron/" user@computer:~$ type app1 app1 is /home/user/folder/app1 user@computer:~$ type app2 app2 is /home/user/folder/app2 user@computer:~$ app1 bash: /home/user/folder/app1: No such file or directory user@computer:~$ app2 bash: /home/user/folder/app2: No such file or directory user@computer:~$ /home/user/folder/app1 bash: /home/user/folder/app1: No such file or directory user@computer:~$ /home/user/folder/app2 bash: /home/user/folder/app2: No such file or directory user@computer:~$ cd /home/user/folder user@computer:~/folder$ app1 bash: /home/user/folder/app1: No such file or directory user@computer:~/folder$ ./app1 bash: ./app1: No such file or directory user@computer:~/folder$ ./app2 bash: ./app2: No such file or directory user@computer:~/folder$ ls -l total 29384 -rwxr-xr-x 1 user user 14949776 2011-02-03 11:09 app1 -rwxr-xr-x 1 user user 15137300 2011-02-03 11:10 app2 user@computer:~/folder$ Thanks for everyone's input! ORIGINAL QUESTION I have two executable files I downloaded and am trying to add to the path. They are located in /home/user/folder and the specific files are /home/user/folder/app1 /home/user/folder/app2 Both app1 and app2 have the executable flag set to all (user, group, other). I can execute the files if I am in /home/user/folder and I execute these commands ./app1 ./app2 However I can't run them from elsewhere. I added this line to my .profile PATH="$PATH:/home/user/folder" and then sourced the path with . /home/user/.profile and I can see app1 and app2 when I use command completion (pressing tab). However here is what happens when I try to run app1 or app2 with the following commands (the following only shows 'app1' but the same is true of 'app2') user@comp:~$ app1 -bash: app1: command not found user@comp:~$ /home/user/folder/app1 -bash: app1: command not found user@comp:~/folder$ ./app1 (program runs) I'm stumped :), I must have missed something simple. Thanks for your help!!

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  • In an iPad SplitView, how do I add a Date Picker control to the Root View?

    - by Dr Dork
    I'm diving into iPhone OS development on the iPad and one of the things I'm playing with is the SplitView template. The template provides a window with a UISplitView view, containing the Root View (on the left of the window) and the Detail View (on the right of the window). The Root View is a subclass of a TableView. Rather than having the entire Root View consist of a TableView, I'd like it to contain a DatePicker view along with the TableView under it. When I go into IB and try and drop a DatePicker into the Root View, it won't let me. It will only let me add a DatePicker view to the Detail View. Why wont IB let me drop a DatePicker view into the Root View? How can I add a DatePicker to the RootView in addition to the TableView? I'm still learning this new platform, so I apologize if these questions are absurd in any way. Thanks so much in advance for your help, I'm going to continue researching these questions right now.

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  • In the Xcode SplitView template for an iPad app, how do I add a Date Picker control to the Root View

    - by Dr Dork
    I'm diving into iPhone OS development on the iPad and one of the things I'm playing with is the SplitView template. The template provides a window with a UISplitView view, containing the Root View (on the left of the window) and the Detail View (on the right of the window). The Root View is a subclass of a TableView. Rather than having the entire Root View consist of a TableView, I'd like it to contain a DatePicker view along with the TableView under it. When I go into IB and try and drop a DatePicker into the Root View, it won't let me. It will only let me add a DatePicker view to the Detail View. Why wont IB let me drop a DatePicker view into the Root View? How can I add a DatePicker to the RootView in addition to the TableView? I'm still learning this new platform, so I apologize if these questions are absurd in any way. Thanks so much in advance for your help, I'm going to continue researching these questions right now.

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  • ExtJS GridPanel Scrollbar does not appear in IE7 but it does in Firefox, etc

    - by Snowright
    Setup I have an accordion layout containing a "properties" panel that nests two inner panels. The first inner panel holds a Ext.DataView, while the second panel is the Ext.grid.GridPanel in question. In the screenshot below, the white space containing the folder icon is the dataview, and below that is the gridpanel. Problem In Firefox, Chrome, and Opera, there is a scrollbar that appears when my gridpanel has an overflow of properties. It is only in Internet Explorer that it does not appear. I am, however, able to scroll using my mouse scroll button in all browsers, including IE. I've also tried removing our custom css file in case it was affecting it somehow, but there was no change in doing so. I'm not sure exactly what code I should show as I don't know where the exact problem is coming from but here is the code for the mainpanel and gridpanel. var mainPanel = new Ext.Panel({ id : 'main-property-panel', title : 'Properties', height : 350, autoWidth : true, tbar : [comboPropertyActions], items : [panel1] //panel1 holds the DataView }); var propertiesGrid = new Ext.grid.GridPanel({ stripeRows : true, height : mainPanel.getSize().height-iconDataView.getSize().height-mainPanel.getFrameHeight(), autoWidth : true, store : propertiesStore, cm : propertiesColumnModel }) //Add gridpanel to mainPanel mainPanel.add(propertiesGrid); mainPanel.doLayout(); Any help into the right direction would be greatly appreciated. Thank you.

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  • UINavigationBar height

    - by kpower
    In my app I work with an UINavigationController. I've added it to the window (MainWindow.xib, with IB) and simulated on my main view (in IB: Simulated User Elements / Top Bar / Navigation Bar). Navigation bar is displayed, but its height isn't standard. At least in IB it is bigger than in launched app. What's wrong? And how can I restore height to the initial state (as in IB)? P.S.: I know that I can set it directly from code. But this way looks like a "crutch".

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  • Is this an acceptable UI design decision?

    - by DVK
    OK, while I'm on record as stating that StackExchange UI is pretty much one of the best websites and overall GUIs that I have ever seen as far as usability goes, there's one particular aspect of the trilogy that bugs me. For an example, head on to http://meta.stackoverflow.com . Look at the banner on top (the one that says "reminder -- it's April Fool's Day depending on your time zone!"). Personally, I feel that this is a "make the user do the figuring out work" anti-pattern (whatever it's officially called) - namely, instead of making your app smart enough to only present a certain mode of operations in the conditions when that mode is appropriate, you simply turn on the mode full on and put an explanation to the user of why the mode is on when it should not be (in this particular example, the mode is of course displaying the unicorn gravatars starting with 00:00 in the first timezone, despite the fact that some users still live in March 31st). The Great Recalc was also handled the same way - instead of proactively telling the user "your rep was changed from X to Y" the same nearly invisible banner was displayed on meta. So, the questions are: Is there such an official anti-pattern, and if so,m what the heck do i call it? Do you have any other well-known examples of such design anti-pattern? How would you fix either the SO example I made or you your own example? Is there a pattern of fixing or must it be a case-by-case solution?

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  • Serial Port Data Structure

    - by Seth Archer
    I need to send data to a hardware device over serial port. I'm using a program called serial port tool for os x. After I connect to the device there is a form box where I can type data to send. I have no idea how to format the data. Here is an excerpt from the manual for the device. "The Net Manager Command structure consists of one start byte, one command byte, five bytes of data, and a one byte checksum. Each message packet is formatted as follows:" an example command is: Byte0=30 Byte1=7 Byte2=5 Byte3=1 Byte4=2 Byte5=0 Byte6=245 How do I type that into the form box in serial port tool? Thanks, Seth

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  • how to change UIPageControl dots

    - by user321130
    greetings! I've seen apps (e.g. meebo) that have different indicators on UIPageControls instead of the default white circles. is there an easy way to do this? I've read the docs for UIPageControls and it seems that there is no methods to replace the images. thank you

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  • When overriding initWithCoder is it always necessary to call [super initWithCoder: coder]

    - by Evan
    In this code I am loading a View Controller (and associated View) from a .xib: -(id)initWithCoder:(NSCoder *)coder { [super initWithCoder:coder]; return self; } This successfully works, but I do not really understand what the line [super initWithCoder:coder] is accomplishing. Is that initializing my View Controller after my View has been initialized? Please be as explicit as possible when explaining. Thanks.

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  • DataGridView not displaying data in ToolStripDropDown

    - by jblaske
    I'm utilizing the code posted by Jesper Palm here: http://stackoverflow.com/questions/280891/make-user-control-display-outside-of-form-boundry /// <summary> /// A simple popup window that can host any System.Windows.Forms.Control /// </summary> public class PopupWindow : System.Windows.Forms.ToolStripDropDown { private System.Windows.Forms.Control _content; private System.Windows.Forms.ToolStripControlHost _host; public PopupWindow(System.Windows.Forms.Control content) { //Basic setup... this.AutoSize = false; this.DoubleBuffered = true; this.ResizeRedraw = true; this._content = content; this._host = new System.Windows.Forms.ToolStripControlHost(content); //Positioning and Sizing this.MinimumSize = content.MinimumSize; this.MaximumSize = content.Size; this.Size = content.Size; content.Location = Point.Empty; //Add the host to the list this.Items.Add(this._host); } } I've translated it to VB: Public Class PopupWindow Inherits System.Windows.Forms.ToolStripDropDown Private _content As System.Windows.Forms.Control Private _host As System.Windows.Forms.ToolStripControlHost Public Sub New(ByVal content As System.Windows.Forms.Control) Me.AutoSize = False Me.DoubleBuffered = True Me.ResizeRedraw = True Me._content = content Me._host = New System.Windows.Forms.ToolStripControlHost(content) Me.MinimumSize = content.MinimumSize Me.MaximumSize = content.MaximumSize Me.Size = content.Size content.Location = Point.Empty Me.Items.Add(Me._host) End Sub End Class It works great with a PictureBox showing its information. But for some reason I cannot get the DataGridView to display anything when it is in the popup. If I pull the grid out of the popup it displays all of its information fine. If I pause during debug, the grid shows that it has all the data in it. It's just not displaying anything. Does anybody have any ideas?

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