array

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have about 0.8 million images of 256x256 in RGB, which amount to over 7GB. I want to use them as training data in a Convolutional Neural Network, and want to put them in a cPickle file, along with their labels. Now, this is taking a lot of memory, to the extent that it needs to swap with my hard drive memory, and almost consume it all. Is this is a bad idea? What would be the smarter/more practical way to load into CNN or pickle them without causing too much memory issue? This is what the code looks like import numpy as np import cPickle

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: How can I insert a new item into an array on any position, for example in the middle of array? 回答1: You may find this a little more intuitive. It only requires one function call to array_splice : $original = array( 'a', 'b', 'c', 'd', 'e' ); $inserted = array( 'x' ); // Not necessarily an array array_splice( $original, 3, 0, $inserted ); // splice in at position 3 // $original is now a b c x d e 回答2: A function that can insert at both integer and string positions: /** * @param array $array * @param int|string $position * @param mixed $insert

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to create a basic following algorithm using Swift and Firebase. My current implementation is the following: static func follow(user: FIRUser, userToFollow: FIRUser) { database.child("users").child(user.uid).observeSingleEventOfType(.Value, withBlock: { (snapshot) in var dbFollowing: NSMutableArray! = snapshot.value!["Following"] as! NSMutableArray! dbFollowing?.addObject(userToFollow.uid) self.database.child("users/"+(user.uid)+"/").updateChildValues(["Following":dbFollowing!]) //add user uid to userToFollows followers array in

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to store an array in a record. Table1: ID, Name, Friends (friends should be an array) 1, Bill, 2&3 2, Charles, 1&3 3, Clare, 1 I want to be able to do a search like this: SELECT * FROM Table1 WHERE Friends='3' to find everyone who has Clare listed as a friend 回答1: Unless you have a really good reason for doing this, you should keep your data normalized and store the relationships in a different table. I think perhaps what you are looking for is this: CREATE TABLE people ( id int not null auto_increment, name varchar(250) not null,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have the following code to solve non-negative least square. Using scipy.nnls. import numpy as np from scipy.optimize import nnls A = np.array([[60, 90, 120], [30, 120, 90]]) b = np.array([67.5, 60]) x, rnorm = nnls(A,b) print x #[ 0. 0.17857143 0.42857143] # Now need to have this array sum to 1. What I want to do is to apply a constraint on x solution so that the it sums to 1. How can I do it? 回答1: I don't think you can use nnls directly as the Fortran code it calls doesn't allow extra constraints. However, the constraint that the equation

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have an app which crashes occasionally due to the array returned by ABAddressBookCopyArrayOfAllPeopleInSourceWithSortOrdering() having a different size to ABAddressBookGetPersonCount(). The shell of the code is shown below. Usually nPeople is the same size as the array. However, on one user's iPhone (or at least, as reported by one user), nPeople is almost twice as large. I can stop the crash by using the array size, rather than ABAddressBookGetPersonCount(). However, I am not sure if this means I am not accessing all of the Contacts in

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have several numbers in an array var numArr = [1, 3, 5, 9]; I want to cycle through that array and multiply every unique 3 number combination as follows: 1 * 3 * 5 = 1 * 3 * 9 = 1 * 5 * 9 = 3 * 5 * 9 = Then return an array of all the calculations var ansArr = [15,27,45,135]; Anyone have an elegant solution? Thanks in advance. 回答1: A general-purpose algorithm for generating combinations is as follows: function combinations(numArr, choose, callback) { var n = numArr.length; var c = []; var inner = function(start, choose_) { if (choose_ == 0)

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a signal of electromyographical data that I am supposed (scientific papers' explicit recommendation) to smooth using RMS. I have the following working code, producing the desired output, but it is way slower than I think it's possible. #!/usr/bin/python import numpy def rms(interval, halfwindow): """ performs the moving-window smoothing of a signal using RMS """ n = len(interval) rms_signal = numpy.zeros(n) for i in range(n): small_index = max(0, i - halfwindow) # intended to avoid boundary effect big_index = min(n, i + halfwindow) #

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'd like to watch an object/array, which ca be edited by a service or by a controllers routine. I thought that an Observable could watch an object/array. My implementation doesn't react on changes of the items : private data : Observable >; private dataObserver: Observer >; private sub : Subscription; private items: >; ngOnInit() { this.items = itemService.getItems(); this.data = new Observable >(observer =>{ this.dataObserver = observer; }); this.data.subscribe( x => console.log('onNext: %s', x), e => console.log('onError: %s', e), () =>

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I keep getting this error and I can't find the problem: exam.c: In function ‘main’: exam.c:21:2: warning: passing argument 1 of ‘calculation’ makes pointer from integer without a cast [enabled by default] exam.c:2:5: note: expected ‘int *’ but argument is of type ‘int’ exam.c:21:2: warning: passing argument 2 of ‘calculation’ makes pointer from integer without a cast [enabled by default] exam.c:2:5: note: expected ‘int *’ but argument is of type ‘int’ I tried to change the arrays to pointers, but that did not work either. Here is my code: