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  • Permuting output of a tree of closures

    - by yan
    This a conceptual question on how one would implement the following in Lisp (assuming Common Lisp in my case, but any dialect would work). Assume you have a function that creates closures that sequentially iterate over an arbitrary collection (or otherwise return different values) of data and returns nil when exhausted, i.e. (defun make-counter (up-to) (let ((cnt 0)) (lambda () (if (< cnt up-to) (incf cnt) nil)))) CL-USER> (defvar gen (make-counter 3)) GEN CL-USER> (funcall gen) 1 CL-USER> (funcall gen) 2 CL-USER> (funcall gen) 3 CL-USER> (funcall gen) NIL CL-USER> (funcall gen) NIL Now, assume you are trying to permute a combinations of one or more of these closures. How would you implement a function that returns a new closure that subsequently creates a permutation of all closures contained within it? i.e.: (defun permute-closures (counters) ......) such that the following holds true: CL-USER> (defvar collection (permute-closures (list (make-counter 3) (make-counter 3)))) CL-USER> (funcall collection) (1 1) CL-USER> (funcall collection) (1 2) CL-USER> (funcall collection) (1 3) CL-USER> (funcall collection) (2 1) ... and so on. The way I had it designed originally was to add a 'pause' parameter to the initial counting lambda such that when iterating you can still call it and receive the old cached value if passed ":pause t", in hopes of making the permutation slightly cleaner. Also, while the example above is a simple list of two identical closures, the list can be an arbitrarily-complicated tree (which can be permuted in depth-first order, and the resulting permutation set would have the shape of the tree.). I had this implemented, but my solution wasn't very clean and am trying to poll how others would approach the problem. Thanks in advance.

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  • Will First() perform the OrderBy()?

    - by Martin
    Is there any difference in (asymptotic) performance between Orders.OrderBy(order => order.Date).First() and Orders.Where(order => order.Date == Orders.Max(x => x.Date)); i.e. will First() perform the OrderBy()? I'm guessing no. MSDN says enumerating the collection via foreach och GetEnumerator does but the phrasing does not exclude other extensions.

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  • Should I use an ArrayList or IList

    - by Farstucker
    Im using the .NET framework 1.1 and Im hoping someone could help me implement a dynamic array of objects? A watered-down example of the object I wish use is below. Class CarObj { public string CarName; public string CarYear; } Should I use an ArrayList or do you think it would be better to make a CarList class to implement an IList interface? Is there a performance benefit for one over another?

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  • Advantages of createElement over innerHTML?

    - by oninea
    In practice, what are the advantages of using createElement over innerHTML? I am asking because I'm convinced that using innerHTML is more efficient in terms of performance and code readability/maintainability but my teammates have settled on using createElement as the coding approach. I just wanna understand how createElement can be more efficient.

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  • nonatomic property in model class when using NSOperationQueue (iPhone)?

    - by Andrew B.
    I have a custom model class with an NSMutableData ivar that will be accessed by custom NSOperation subclasses (using an NSOperationQueue). I think I can guarantee thread-safe access to the ivar from multiple NSOperations by using dependencies, and I can guarantee that I don't access the ivar from other code (say my main app thread) by waiting until the Q has finished all operations. Should I use a nonatomic property specification, or leave it atomic? Is there a significant impact on performance?

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  • Setting UITableViewCell height is expensive

    - by Sheehan Alam
    I am doing a comparison in - (CGFloat)tableView:(UITableView *)tblView heightForRowAtIndexPath:(NSIndexPath *)indexPath It seems like performance of my app really slows down when I check if a cell.detailTextLabel.text isEqualTo:@"None"; What is a better way of doing the comparison and setting the cell height?

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  • speed of map() vs. list comprehension vs. numpy vectorized function in python

    - by mcstrother
    I have a function foo(i) that takes an integer and takes a significant amount of time to execute. Will there be a significant performance difference between any of the following ways of initializing 'a': a = [foo(i) for i in xrange(100)] , a = map(foo, range(100)) , and vfoo = numpy.vectorize(foo) vfoo(range(100)) ? (I don't care whether the output is a list or a numpy array). Is there some other better way of doing this? Thanks.

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  • How to load MS Word document in C# (.NET)?

    - by Skuta
    Hi, How do I load MS Word document (.doc and .docx) to memory (variable) without doing this?: wordApp.Documents.Open I don't want to open MS Word, I just want that text inside. You gave me answer for DOCX, but what about DOC? I want free and high performance solution - not to open 12.000 instances of Word to process all of them. :( Aspose is commercial product, and 900$ is a way too much for what I do.

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  • PHP: Which DB/DB Engine supports search well?

    - by KeyStroke
    Hi, I'm starting a site which relies heavily on search. While it's probably going to search basic meta data in the beginning, it might grow to something bigger in the future. So which DB/DB Engine is best in your opinion when it comes to search performance and future scalability? Appreciate your help

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  • J2me - Arrays vs vector ?

    - by Galaxy
    if we have to implementations of string split for j2me, one returns vector and the other returns array , in terms of performance on hand held devices which one is the best choice ?

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  • Can computer clusters be used for general everyday applications?

    - by Matt Pascoe
    Does anyone know how a computer cluster can be used for everyday applications, like for example video games? I would like to build a computer cluster that can run applications over the cluster that were not specifically designed for computer clusters and still see the performance increase. One use would be for video games, but I would also like to utilize the increased computing power for running a large network of virtualized machines.

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  • Using Int32 or what you need

    - by Sir Psycho
    Should you use Int32 in places where you know the value is not going to be higher than 32,767? I'd like to keep memory down, hoever, using casts everywhere just to perform simple arithmetic is getting annoying. short a = 1; short result = a + 1; // Error short result = (short)(a + 1); // works but looks ugly when does lots of times What would be better for overall application performance?

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  • memcached vs. internal caching in PHP?

    - by waitinforatrain
    Hey, I'm working on some old(ish) software in PHP that maintains a $cache array to reduce the number of SQL queries. I was thinking of just putting memcached in its place and I'm wondering whether or not to get rid of the internal caching. Would there still be a worthwihle performance increase if I keep the internal caching, or would memcached suffice?

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  • Is there any advantage for using a library other than Hibernate for JPA?

    - by Jeduan Cornejo
    Hi, I've been using JPA for some time now and been in projects where we've used both Hibernate Annotations and Toplink Essentials. AFAIK the project leader chose Toplink because Netbeans had it integrated and seemed to be the easy thing to do. However when looking for help, most of the literature seemed to assume that you are using Hibernate as the JPA provider, so, the question is, is have you found any advantage, performance or otherwise for not using the de-facto standard for JPA, Hibernate?

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  • Shall web services call on iphone using GPRS connectivity?

    - by Rajendra Bhole
    Hi, I am beginner in iphone development. I develop an application in which i call some web services in my application. When that application i ran on iphone device using Wi-Fi connectivity then it work fine and well condition also in good performance, but when that application ran on GPRS connection then the web service call well and after that application collapsed.What will be the exact problem dose with my application? Could any different setting between Wi-Fi and GPRS?

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  • Recommended book for Sql Server query optimisation

    - by Patrick Honorez
    Even if I have made a certification exam on Sql Server Design and implementation , I have no clue about how to trace/debug/optimise performance in Sql Sever. Now the database I built is really business critical, and getting big, so it is time for me to dig into optimisation, specially regarding when/where to add indexes. Can you recommend a good book on this subject ? (smaller is better :) Just in case: I am using Sql Server 2008. Thanks

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  • Any Javascript optimization benchmarks?

    - by int3
    I watched Nicholas Zakas' talk, Speed up your Javascript, with some interest. I liked how he benchmarked the various performance improvements created by various optimization techniques, e.g. reducing calls to deeply nested objects, changing loops to count down instead of up, etc. I would like to run these benchmarks myself though, to see exactly how our current browsers are faring. I guess it wouldn't be too difficult to cook up some timed loops, but I'd like to know if there are any existing implementations out there.

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