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• php/mysql show data from chosen checkboxes

  - by Michael

  Hi. I have a table called FRUIT id type daysold 1 banana 5 2 apple 6 3 apple 4 4 peach 2 5 banana 6 What I would like is to have 3 checkboxes: Banana [ ] Apple [ ] Peach [ ] SUBMIT Then if I've only checked "Banana" and "Peach" the mysql output should only show me the rows that matches those two types. And the checkboxes should remain checked to highlight what was chosen. I can make the checkboxes but then that's about it really. I don't know how to properly get the info from the checkboxes and down to the WHERE argument in the MYSQL-code. Especially not with two types chosen. If it was just a dropdown menu with a single choice then I'd add the choice to the url and put WHERE type='$choice' - but I'm struggling with the multiple choices. I'm a bit of a novice at both php and mysql, so I'm a bit lost on this one.

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• set / line intersection solution

  - by Xavier

  I have two lists in python and I want to know if they intersect at the same index. Is there a mathematical way of solving this? For example if I have [9,8,7,6,5] and [3,4,5,6,7] I'd like a simple and efficient formula/algorithm that finds that at index 3 they intersect. I know I could do a search just wondering if there is a better way. I know there is a formula to solve two lines in y = mx + b form by subtracting them from each other but my "line" isn't truly a line because its limited to the items in the list and it may have curves. Any help is appreciated.

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• Is the recent trend toward widescreen (16:9) computer monitors a plus or minus for programmers?

  - by DanM

  It's almost gotten to the point where you can't buy a conventional (4:3) monitor anymore. Pretty much everything is widescreen. This is fine for watching movies or TV, but is it good or bad for programming? My initial thoughts on the issue are that widescreens are a net negative for programmers. Here are some of the disadvantages I see: Poor space utiliziation One disadvantage of widescreens you can't argue with is that they offer poor space utilization for the amount of total pixels you get. For example, my Thinkpad, which I bought just before the widescreen craze, has a 15" monitor with a native resolution of 1600 x 1200. The newer 15.4" Thinkpads run at most 1680 x 1050. So (if you do the math) you get fewer pixels in a wider (but not shorter) package. With desktop monitors, you pay a price in terms of desk space used. Two 1680 x 1050 monitors will simply take up more of your desk than two 1600 x 1200 monitors (assuming equal dot pitch). More scrolling If you compare a 1680 x 1050 monitor to a 1600 x 1200 monitor, you get 80 extra pixels of width but 150 fewer pixels of height. The height reduction means you lose approximately 11 lines of code. That's less you can see on the screen at one time and more scrolling you have to do. This harms productivity, maybe not dramatically, but insidiously. Less room for wide panels Widescreens also mean you lose space for wide but short panels common in programming environments. If you use Visual Studio, for example, your code window will be that much shorter when viewing the Find Results, Task List, or Error List (all of which I use frequently). This isn't to say the 80 pixels of extra width you get with widescreen would never be useful, but I tend to keep my lines of code short, so seeing more lines would be more valuable to me than seeing fewer, longer lines. What do you think? Do you agree/disagree? Are you now using one or more widescreen monitors for development? What resolution are you running on each? Do you ever miss the height of the traditional 4:3 monitor? Would you complain if your monitors were one inch narrower but two inches taller?

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• In MongoDB, how can I replicate this simple query using map/reduce in ruby?

  - by Matthew Rathbone

  Hi, So using the regular MongoDB library in Ruby I have the following query to find average filesize across a set of 5001 documents: avg = 0 total = collection.count() Rails.logger.info "#{total} asset creation stats in the system" collection.find().each {|row| avg += (row["filesize"] * (1/total.to_f)) if row["filesize"]} Its pretty simple, so I'm trying to do the same using map/reduce as a learning exercise. This is what I came up with: map = 'function(){emit("filesizes", {size: this.filesize, num: 1});}' reduce = 'function(k, vals){ var result = {size: 0, num: 0}; for(var x in vals) { var new_total = result.num + vals[x].num; result.num = new_total result.size = result.size + (vals[x].size * (vals[x].num / new_total)); } return result; }' @results = collection.map_reduce(map, reduce) However the two queries come back with two different results! What am I doing wrong?

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• How to convert a .NET WebService-Method-Result (Soap) into its original datatype?

  - by Marc

  Hello everyone. I have two "identical" webservices (Soap) on two different servers. Don't ask why :-) WebService-1 decides if it handels the request itself or if it passes the request to WebService-2. If so, the response of WebService-2 should directly be returned from WebService-1. The response datatype is complex and self defined. With simple datatypes like 'int or 'string' there would be no problem. The response of WebService-2 is a serialized object (I think it is called "stubs") and theredore it is not possibel to pass this object through as the response of WebService-1 because the type of the objects doesn't match. Is there a simple way to convert the serialised datatype into its original type without buiding a complex converter?

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• problem using ant move task

  - by user315228

  I have a directory structure like this client/lib a.jar b-4.3.jar c-1.2.jar d-4.3.jar e.jar I need to copy some jars without version and some with version. The only information that i have is version number, and that is stored in a variable. Problem is version number that i have in variable is 4.3.1 and version that jars have is just first two digits from the variable value (i.e. 4.3 in my case). I need all the jars that has starting two digits that my variable has and some of the jars without version. For e.g. from above directory structure i need: b-4.3.jar d-4.3.jar e.jar Can somebody please help?

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• How to Sum calulated fields

  - by Nazero Jerry

  I‘d like to ask I question that here that I think would be easy to some people. Ok I have query that return records of two related tables. (One to many) In this query I have about 3 to 4 calculated fields that are based on the fields from the 2 tables. Now I want to have a group by clause for names and sum clause to sum the calculated fields but it ends up in error message saying: “You tried to execute a query that is not part of aggregate function” So I decided to just run the query without the totals *(ie no group by , sum etc,,,) : And then I created another query that totals my previous query. ( i.e. using group by clause for names and sum for calculated fields… no calculation here) This is fine ( I use to do this) but I don’t like having two queries just to get summary total. Is their any other way of doing this in the design view and create only one query?. I would very much appreciate. Thankyou: JM

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• How to resolve Resharper's "unused property" warning on properties solely for Display/Value Members?

  - by JYelton

  I have defined two properties "Name" and "ID" for an object which I use for the DisplayMember and ValueMember of a ComboBox with a BindingList datasource. I recently installed Resharper to evaluate it. Resharper is giving me warnings on the object that the two properties are unused. Sample code: BindingList<ClassSample> SampleList = new BindingList<ClassSample>(); // populate SampleList cmbSampleSelector.DisplayMember = "Name"; cmdSampleSelector.ValueMember = "ID"; cmbSampleSelector.DataSource = SampleList; private class ClassSample { private string _name; private string _id; public string Name // Resharper believes this property is unused { get { return _name; } } public string ID // Resharper believes this property is unused { get {return _id; } } public ClassSample(string Name, string ID) { _name = Name; _id = ID; } } Am I doing something wrong or is Resharper clueless about this particular usage?

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• jquery event get array of objects

  - by Anton

  I have few nested DIV elements. For example: <div id='id1'><div id='id2'>content</div></div> I attach event to DIVs event handler using jQuery: $('div').click(function () { //some code }); There will be two events when user click on content. So there will be two simultaneous events. Is it possible to get inside event handler array of objects (DIVs) what have click event? May be it is possible using other framework but jQuery?

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• Computer graphics: programatically create duotone (or separations)

  - by TarGz

  There are special kind of images called "duotone" which have just two channels. It is mostly used when you want to achive higher quality reproduction - have a printing press with two colors (black , gray). My question is, I have normal gray-scale image, how to convert it to duotone? I know I can tweak the curves in Photoshop - this is not what I'm asking, rather than how to do it programmatically? Perhaps there is a library which can do just that? What about "dot gain compensation"? "Total ink coverage"?

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• Firefox, prevent rendering between javascript statements.

  - by Erik

  I'm trying to create some kind of zoom around the mouse cursor feature on my website which ultimately runs these two lines (+ the same for height/scrollTop). canvas.style.width = someValue; canvas.parentNode.scrollLeft = someOtherValue; The problem is that in firefox(3.6) the page is re-rendered directly after the first row has been executed and since the view is depending on both values this means that every time i recalculate the view firefox will will render an invalid view before the correct one, in other words creating flicker. I've tried swapping the two rows but get the same problem. In chrome, opera and IE this doesn't happen. Both lines are executed before any rendering is done. Is there any way to lock the rendering manually, maybe something like this? document.disableRendering(); //fantasy function canvas.style.width = someValue; canvas.parentNode.scrollLeft = someOtherValue; document.enableRendering(); //fantasy function

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• Real life usage of the projective plane theory

  - by Elazar Leibovich

  I'm learning about the theory of the projective plane. Very generally speaking, it is an extension of the plane, which includes additional points which are defined as the intersection points of two parallel lines. In the projective plane, every two lines have an interesection point. Whether they're parallel or not. Every point in the projective plane can be represented by three numbers (you actually need less than that, but nevemind now). Is there any real life application which uses the projective plane? I can think that, for instance, a software which needs to find the intersections of a line, can benefit from always having an intersection point which might lead to simpler code, but is it really used?

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• Adding a new view to a Window-based app (re: MapKit tutorial)

  - by blackkettle

  I'm trying add a new view in a window-based application but not really getting anywhere. I've been going through a great MapKit tutorial lately, http://mithin.in/2009/06/22/using-iphone-sdk-mapkit-framework-a-tutorial/ and have successfully set it up and added some further buttons and customizations. However I've gotten stuck at what I assume ought to be a brain-dead simple step. I have added a toolbar to the bottom of the app, and a 'settings' style button. Following this I created a SettingsViewController complete with it's own view. Now I'd like to connect them but I've had absolutely no luck trying to figure out how to do this. I've also gone through several other good tutorials lately, http://miketeo.net/wp/index.php/2008/08/31/simple-iphone-tutorial-part-1.html http://blog.webscale.co.in/?p=228 http://www.iphonesdkarticles.com/2009/01/uitableview-searching-table-view.html but I've gotten lost trying to tie these two bits together. I'm sure it is quite trivial to link these two items but I've had no luck.

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• What's the best way to access Neo4j from Django?

  - by abdel

  it seems that i found something that let me confused; i've found two Neo4j to download to python, the first one is: http://pypi.python.org/pypi/neo4j-embedded and the second one is: https://svn.neo4j.org/components/neo4j.py/trunk/ what's the difference between the two? the first one seems to be big (size), so does this mean that if i use it i'll not need the neo4j community release (milestone)? when i've installed the first one, and tried to test a django example, it seems that the directory named "model" https://svn.neo4j.org/components/neo4j.py/trunk/src/main/python/neo4j/model/ is missing? so what's the difference, and who will be better to use with Django? and what about that one? http://pypi.python.org/pypi/neo4django/

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• Debug a local maven dependency with eclipse

  - by mcamier

  i have two maven projects, the first one is a library and the other one use it to works properly, the both have to elvolve regardless each other, this is why i use two different project. But breakpoints on my library code doesn't work when i launch my app (the second application). This is how i include my library in the second project's POM (my IDE is eclipse and projects are in the same workspaces) <dependency> <groupId>com.mcamier</groupId> <artifactId>lazyEngine</artifactId> <version>0.0.1-SNAPSHOT</version> <scope>system</scope> <systemPath>${basedir}/../lazyEngine/target/lazyEngine-0.0.1-SNAPSHOT-jar-with-dependencies.jar</systemPath> </dependency>

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• Math Question: Is it possible to calculate the row position as you loop through a cartesian product

  - by Kuyenda

  Is it possible to calculate the row position in the cartesian product of two arrays? For example if you have one array of two rows and another of three rows it's easy to calculate the size of the cartesian product (Array1.Rows.Count * Array2.Rows.Count = 6), but you can't iterate through each array and just use the product of the respective row positions to calculate the row position in the cartesian product. Array1.Row * Array2.Row 1 * 1 = 1 1 * 2 = 2 2 * 1 = 2 2 * 2 = 4 3 * 1 = 3 3 * 2 = 6 Is there a formula to obtain the result 1, 2, 3, 4, 5, 6 from Array1.Row and Array2.Row as you iterate through them in the following fashion: For 1 To Array1.Rows.Count For 1 To Array2.Rows.Count 'some formula here to get cartesian row position' Next Array2.Row Next Array1.Row Thanks!

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• Monodevelop: "Are you missing an assembly reference?" despite reference being added

  - by Nicolas Raoul

  I have a solution with 3 projects. Two of the projects compile fine: SparkleLib and SparkleLib.Cmis The third project (SparkleShare) depends on the two above, so I added them as references, but I get: The type or namespace name 'Cmis' does not exist in the namespace 'SparkleLib'. Are you missing an assembly reference? The error indicates that I should add SparkleLib.Cmis as a reference, but I already added it... I tried deleteting, re-adding, restarting, but no success. It is not a problem with my environment, as my fellow developers are having the same problem.

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• Comparison in Redundant binary representation RBR

  - by Morano88

  How can I compare two numbers in the form of Redundant binary representation RBR ? Any Idea ?

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• Getting the time elapsed (Objective-c)

  - by Ilya

  I need to get time that elapsed between two events: for example between appearance of UIView and between user's first reaction.

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• python decorator to add function to list in current scope

  - by AlexH

  Goal: Make a decorator which can modify the scope that it is used in. If it worked: class Blah(): # or perhaps class Blah(ParentClassWhichMakesThisPossible) def one(self): pass @decorated def two(self): pass Blah.decorated ["two"] Why? I essentially want to write classes which can maintain specific dictionaries of methods, so that I can retrieve lists of available methods of different types on a per class basis. errr..... I want to do this: class RuleClass(ParentClass): @rule def blah(self): pass @rule def kapow(self): pass def shazam(self): class OtherRuleClass(ParentClass): @rule def foo(self): pass def bar(self): pass RuleClass.rules.keys() ["blah", "kapow"] OtherRuleClass.rules.keys() ["foo"]

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• 3D Math: Calculate Bank (Roll) angle from Look and Up orthogonal vectors

  - by 742

  I hope this is the proper location to ask this question which is the same as this one, but expressed as pure math instead of graphically (at least I hope I translated the problem to math correctly). Considering: two vectors that are orthogonal: Up (ux, uy, uz) and Look (lx, ly, lz) a plane P which is perpendicular to Look (hence including Up) Y1 which is the projection of Y (vertical axis) along Look onto P Question: what is the value of the angle between Y1 and Up? As mathematicians will agree, this is a very basic question, but I've been scratching my head for at least two weeks without being able to visualize how to project Y onto P... maybe now too old for finding solutions to school exercises. I'm looking for the trigonometric solution, not a solution using a matrix. Thanks.

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• nested columns in compass/sass

  - by corroded

  I've been studying compass and while it is a fun thing to play with and use, one thing bothers me(besides being unable to add padding as it wrecks the grid), how do I nest columns? I want to be able to do what blueprint does: nest containers like say, I have a 24-column page divided in two(17 and 7 columns). In the right part of that page(the one with 7 columns), I want to divided some elements into two(2 and 5 columns). I tried this: #main +container #main-content +column(17) +box-padding(17, 10px) :margin :right 0 #sidebar +column(7, true) +box-padding(7, 10px) That's the code for the main page. The sidebar contains a list with some labels and input fields li +container :margin :bottom 5px label +column(2) :margin :right 0 input +column(5, true) It kinda works, but inspecting the li in firebug shows that it's width is actually 950px as opposed to be just 270px since it is just 7 columns. I tried googling about nested columns but I can't seem to find any example in compass. I've also tried the wiki and the documentation to no avail.

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• Calculating a delta of years from a date

  - by Spiros

  I am trying to figure out a way to calculate the year of birth for records when given the age to two decimals at a given date - in Perl. To illustrate this example consider these two records: date, age at date 25 Nov 2005, 74.23 21 Jan 2007, 75.38 What I want to do is get the year of birth based on those records - it should be, in theory, consistent. The problem is that when I try to derive it by calculating the difference between the year in the date field minus the age, I run into rounding errors making the results look wrong while they are in fact correct. I have tried using some "clever" combination of int() or sprintf() to round things up but to not avail. I have looked at Date::Calc but cant see something I can use. p.s. As many dates are pre-1970, I cannot not unfortunately use UNIX epoch for this.

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• Algorithm to find a measurement of similarity between lists.

  - by Cubed

  Given that I have two lists that each contain a separate subset of a common superset, is there an algorithm to give me a similarity measurement? Example: A = { John, Mary, Kate, Peter } and B = { Peter, James, Mary, Kate } How similar are these two lists? Note that I do not know all elements of the common superset. Update: I was unclear and I have probably used the word 'set' in a sloppy fashion. My apologies. Clarification: Order is of importance. If identical elements occupy the same position in the list, we have the highest similarity for that element. The similarity decreased the farther apart the identical elements are. The similarity is even lower if the element only exists in one of the lists. I could even add the extra dimension that lower indices are of greater value, so a a[1] == b[1] is worth more than a[9] == b[9], but that is mainly cause I am curious.

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• Differences between matrix implementation in C

  - by tempy

  I created two 2D arrays (matrix) in C in two different ways. I don't understand the difference between the way they're represented in the memory, and the reason why I can't refer to them in the same way: scanf("%d", &intMatrix1[i][j]); //can't refer as &intMatrix1[(i * lines)+j]) scanf("%d", &intMatrix2[(i * lines)+j]); //can't refer as &intMatrix2[i][j]) What is the difference between the ways these two arrays are implemented and why do I have to refer to them differently? How do I refer to an element in each of the arrays in the same way (?????? in my printMatrix function)? int main() { int **intMatrix1; int *intMatrix2; int i, j, lines, columns; lines = 3; columns = 2; /************************* intMatrix1 ****************************/ intMatrix1 = (int **)malloc(lines * sizeof(int *)); for (i = 0; i < lines; ++i) intMatrix1[i] = (int *)malloc(columns * sizeof(int)); for (i = 0; i < lines; ++i) { for (j = 0; j < columns; ++j) { printf("Type a number for intMatrix1[%d][%d]\t", i, j); scanf("%d", &intMatrix1[i][j]); } } /************************* intMatrix2 ****************************/ intMatrix2 = (int *)malloc(lines * columns * sizeof(int)); for (i = 0; i < lines; ++i) { for (j = 0; j < columns; ++j) { printf("Type a number for intMatrix2[%d][%d]\t", i, j); scanf("%d", &intMatrix2[(i * lines)+j]); } } /************** printing intMatrix1 & intMatrix2 ****************/ printf("intMatrix1:\n\n"); printMatrix(*intMatrix1, lines, columns); printf("intMatrix2:\n\n"); printMatrix(intMatrix2, lines, columns); } /************************* printMatrix ****************************/ void printMatrix(int *ptArray, int h, int w) { int i, j; printf("Printing matrix...\n\n\n"); for (i = 0; i < h; ++i) for (j = 0; j < w; ++j) printf("array[%d][%d] ==============> %d\n, i, j, ??????); }

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