# coursera swift programming

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### Coursera Series-R programming third week-lexical scopes

(Datasets) data (IRIS)#Exploratory Analysisnames (Iris) head (IRIS)#The following attempts to take Virginica,speal. The method of length is all wrongiris[,2]iris[iris\$species=="virginica", 2]mean (iris[iris\$species=="virginica", 2])##the above is Error,not correct##tapply (Test\$sepal.length,test\$species,mean)#using Species.mean to group vectors, this method is feasible, but the above method is necessary to look at the errorLibrary (Datasets) data (Mtcars) #以下为做某个题时的若干测试. And a trial-and-error l

### coursera-Wunda-Machine learning-(programming exercise 7) K mean and PCA (corresponds to the 8th week course)

This series is a personal learning note for Andrew Ng Machine Learning course for Coursera website (for reference only)Course URL: https://www.coursera.org/learn/machine-learning Exercise 7--k-means and PCA Download coursera-Wunda-Machine learning-all programming practice answers In this exercise, you will implement the K-means clustering algorithm and apply it t

### Neural network and deep learning programming exercises (Coursera Wunda) (3)

full implementation of multi-layered neural network recognition picture of the cat Original Coursera Course homepage, in the NetEase cloud classroom also has the curriculum resources but no programming practice. This program uses the functions completed in the last job, fully implementing a multilayer neural network, and training to identify whether there is a cat in the picture. There is no comment in t

### Coursera Public Lesson-machine_learing: Programming 6

Support Vector MachinesI have the some issues to state. First, there were some bugs in original code which is caused by versions. I don ' t know ...There is three pictures u need to draw a division boundary. The first calls ' VISUALIZEBOUNDARYLINEAR.M ' which is fine and the others which call ' visualizeboundary.m ' can notDraw boundaries. So I check out this file and change the code ' contour (X1, X2, Vals, [0 0], ' Color ', ' B '); ' to ' Contour (X1, X2, Vals, [0.1 0.1], ' LineColor ', ' B ')

### Beijing University C + + programmingCoursera course Fourth week in question 3

Questions -31 point Possible (graded) Total time limit: 1000ms Memory Limit: 65536kB Describe Write a two-dimensional array class Array2, so that the following program output is: 0,1,2,3, 4,5,6,7, 8,9,10,11, Next 0,1,2,3, 4,5,6,7, 8,9,10,11, Program: #include Add your code here int main () { Array2 a (3,4); int i,j; fo

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### Coursera open course Functional Programming Principles in Scala exercise answer: Week 2

function and map the given set to another set. The signature is as follows: def map(s: Set, f: Int => Int): Set The second parameter f is used to map the elements of the original set to the functions of the new set (first-class citizen !) The question looks simple, just to judge whether the elements in s are equal to the input integer after f ing. This includes two steps: 1. Is there any element in s that meets a specific condition (assertion )? 2. The specific condition (assertion) is mapped t

### Coursera-an Introduction to Interactive programming in Python (Part 1)-mini-project #4-"Pong"

(Paddle2_pos,1,'Blue',' White') #determine whether paddle and ball collide ifBall_pos[0] Pad_width:ifBALL_POS[1] >= paddle1_pos[0][1] andBALL_POS[1] ]: Spawn_ball (right)Else: Score2+ = 1ifBall_pos[0] >= Width-pad_width-Ball_radius:ifBALL_POS[1] >= paddle2_pos[0][1] andBALL_POS[1] ]: Spawn_ball (left)Else: Score1+ = 1#Draw scoresCanvas.draw_text (str (score1), [WIDTH/2-40, 40], 30,' White') Canvas.draw_text (str (score2), [WIDTH/2 + 20, 40], 30,' White')defKeyDown (key):GlobalPaddle1_vel,

### Coursera-an Introduction to Interactive programming in Python (Part 1)-mini-project #3-"Stopwatch:the Game"

(stop_num)#define event handlers for buttons; "Start", "Stop", "Reset"defStart_handler (): Timer.start ()defStop_handler (): Timer.stop ()defReset_handler (): Timer.stop ()GlobalTGlobalt_str Reset_score ()#Define event handler for timer with 0.1 sec intervaldefTimer_handler ():GlobalTGlobalT_str T= t + 1T_str=format (t)defTimer_score_handler (): Update_score ()#Define Draw HandlerdefDraw_handler (Canvas): Canvas.draw_text (t_str, Position,36," White") Canvas.draw_text (SCORE_STR, [160, 20], 16,

### What is the essence of scala pattern matching? -Starting from responsive programming of Coursera

We recommend the responsive programming course on Coursera, an advanced Scala language course. At the beginning of the course, we proposed an Application Scenario: constructing a JSON string. If you do not know the JSON string, you can simply Google it. To do this, we define the following classes abstract class JSON case class JSeq(elems: List[JSON]) extends JSON case class JObj(bindings: Map[String, JSON]

### Stanford Coursera Machine Learning Programming Job Exercise 5 (regularization of linear regression and deviations and variances)

different lambda, the calculated training error and cross-validation error are as follows:Lambda Train error Validation error 0.000000 0.173616 22.066602 0.001000 0.156653 18.597638 0.003000 0.190298 19.981503 0.010000 0.221975 16.969087 0.030000 0.281852 12.829003 0.100000 0.459318 7.587013 0.300000 0.921760 1.000000 2.076188 4.260625 3.000000 4.901351 3.822907 10.000000 16.092213 9.945508The graphic is represented as follows:As

### Coursera Machine Learning second week programming job Linear Regression

use of MATLAB. *.4.gradientdescent.mfunction [Theta, j_history] =gradientdescent (X, y, theta, Alpha, num_iters)%gradientdescent performs gradient descent to learn theta% theta = gradientdescent (X, y, theta, Alpha, num_iters) up Dates theta by% taking num_iters gradient steps with learning rate alpha% Initialize Some useful valuesm= Length (y);%Number of training examplesj_history= Zeros (Num_iters,1); forITER =1: Num_iters% ====================== YOUR CODE here ======================% instru

### [Swift learning] Swiftprogramming journey (1): swift learning programming journey

[Swift learning] Swift programming journey (1): swift learning programming journey The most classic example of learning a new language is to output "Hello World !" Print ("Hello World! ") Swift is output in this way. If you have u

### [Swift learning] Swiftprogramming journey (3): swift learning programming journey

[Swift learning] Swift programming journey (3): swift learning programming journey 　　Tuples) 　　Tuples combines multiple single values into a composite value. It can contain any type of value, and does not need to be of the same type. 1. Create tuples 1. let http404error = (

### [Swift learning] Swiftprogramming tour --- ARC (20), swift --- arc

[Swift learning] Swift programming tour --- ARC (20), swift --- arc Swift uses automatic reference count (ARC) to track and manage the memory used by the application. In most cases, this means that in the Swift language, memory ma

### [Swift learning] Swiftprogramming tour-character and string (5), swift tour

[Swift learning] Swift programming tour-character and string (5), swift tour String is the String type of swift. A string is a valid Character Sequence. Therefore, a character set can be expressed in combination. You can use the + symbol to connect to a string. String type

### [Swift learning] Swiftprogramming tour-array of Collection types (6), swift tour

[Swift learning] Swift programming tour-array of Collection types (6), swift tour Swift provides three main collection types: array, set, and dictionary. This section describes array. An array is a set of the same type of storage order. The same value can appear in differe

### Breeze annotation-Swiftprogramming language, annotation-swiftProgramming

Breeze annotation-Swift programming language, annotation-swift Programming Preface Apple released a new Swift programming language for developing iOS and OS X applications. Its purpose is self-evident: To give old Objective-C a su

### [Swift learning] Swiftprogramming tour-expansion (24), swift tour

[Swift learning] Swift programming tour-expansion (24), swift tour An extension adds new features to an existing class, struct, or enumeration type, including attributes and Methods. If you define an extension to add new features to an existing type, this new function is available to all existing instances of this type

### Analysis process of the Swiftprogramming language and the swiftprogramming language process

Analysis process of the Swift programming language and the swift programming language process The Destructor is called immediately before a class instance is released. Deinit is used to indicate the destructor, similar to the initialization function. The Destructor only applies to the class type. Analysis Process Pri

### SwiftProgramming Language Learning-Introduction to Swift

Sometimes, it may take some time to read English documents. If you read Chinese documents, you may be afraid of inaccurate translation. In some cases, you do not need to write any word. If the translation is inaccurate, ambiguity may occur, so let's take a look at Swift in this way.Swift is a new programming language for iOS and OS X apps that builds on the best of C and Objective-C, without the constraints

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