Tag: So

Is there a way to RUN multiple versions of Node.js simultaneously on Windows?

Post author By Full Stack
Post date April 9, 2021
No Comments on Is there a way to RUN multiple versions of Node.js simultaneously on Windows?

So, to be clear, I’m not asking about the possibility of INSTALLING multiple versions of Node, or the capability of switching between multiple versions with something like nvm. (The original nvm package for Mac/Linux has an "exec" command that lets you run a command under a particular version of node. I think this would be […]

Tags but it causes the API to fail with an "unsupported Node version" error. I haven't tried the converse approach because this error (along with, I need to run both simultaneously, I'm not asking about the possibility of INSTALLING multiple versions of Node, or the capability of switching between multiple versions with something like nvm. (The original nvm package for Mac/Linux has an "exec" comm, So, so I can hit my API with my React app. I have tried starting my API under Node 14.0.0, then using nvm to switch to 11.14.0 to run the React app, To be clear, which itself is a customer requirement). I also have a basic React app (using Parcel bundler) that runs under Node 11.14.0. I can't update t

Mastering Development

Trying to make a Snake And Ladder game in PHP [closed]

Post author By Full Stack
Post date April 8, 2021
No Comments on Trying to make a Snake And Ladder game in PHP [closed]

So, im a beginner trying to make a snake and ladder code through php, html and css. The game should ask a question everytime the player rolls the dice. My problem now is : 1)I do not know how to connect the dice to my question page My "code" pastebin.com/p19e02bm from codepen

Tags html and css. The game should ask a question everytime the player rolls the dice. My problem now is : 1)I do not know how to connect the dice, im a beginner trying to make a snake and ladder code through php, So

Mastering Development

How to move the data that I have called from the Firebase real-time database, in a listview to another activity in android studio?

So, I have a simple listview application. When I click an item, it will send the data to the next activity using Bundle. In the first time, I use this JSON structure "teacher": [ { "name": "Carl", "age": "40" }, { "name": "Johnson", "age": "44" } ], And this is my Java code: Query query […]

Tags _age); TeacherDetailBottomSheet bottomSheetDialog = new TeacherDetailBottomSheet(); bottomSheetDialog, _name); bundle.putString("dataAge", 'age': '40', "002": { "name": "Johnson", "age": "44" } } And maybe add another child "teacher": { "001": { "name": "Carl", "exampleBottomSheet"); } @Override public void onCancelled(@NonNull DatabaseError databaseE, "phone-number": "...." } } What should I change in the Java code? especially in the setOnItemClick method. I want to show name & age c, { name: 'Johnson', age, age: 44}, and send all the data (name, And this is my Java code: Query query = FirebaseDatabase.getInstance().getReference("teacher"); query.addValueEventListener(new ValueEve, but haven't found a clear solution., EMAIL, final int position, I have a simple listview application. When I click an item, I use this JSON structure "teacher": [ { "name": "Carl", it will send the data to the next activity using Bundle. In the first time, long id) { Query _query = FirebaseDatabase.getInstance().getReference("teacher"); _query.addValueEventListener(new V, phone number, phone) to the next activity. I've searched for the similar question, So, View view

Mastering Development

How do I make c++ read \n inside of a character array?

Post author By Full Stack
Post date April 7, 2021
No Comments on How do I make c++ read \n inside of a character array?

So, I am a beginner programmer in c++ and I started working on a short word search. I added a bool to the program where I can check if the word is either contained or is an exact word match. The problem is I tried to do this if text[textPos+1]=’\n’ and of course it doesn’t […]

Tags at which point I tried to check if the space in the array found right after the word in data.in is a \n which doesn't work. Let's say we hav, but none of them have worked for me (examples: doing \r or using the ascii table numbers to check for an enter). I'm going to attach my code, except if the program had a enter after the word, I am a beginner programmer in c++ and I started working on a short word search. I added a bool to the program where I can check if the word i, I'll explain the code and leave the shortened version above. The code as it is right now reads the text out of a file called data.in and the, ios::in); fstream wordReader("word.in", ios::in); while (textReader.get(text[textLength])) { textLength++; } while (!wordReader.eof()) { wordReader >> wo, match = 0; char word[90]; char text[1000]; fstream textReader("data.in", So, textLength = 0, which worked for the most part

Mastering Development

Variance and covariance of a bivariate normal distribution

Post author By Full Stack
Post date April 5, 2021
No Comments on Variance and covariance of a bivariate normal distribution

So, I asked a similar question recently and it was about finding variance of a one-variable normal distribution. In that case with given (x,y) we could find mean(mn) and variance(sgm) using^ mn = np.average(x, weights=y) sgm = np.average((abs(x-mn))**2, weights=y) However, I can’t find a way to make an analogical thing for a bivariate normal distribution: […]

Tags 0) meny = np.mean(Z, 1) mn_x = np.average(x, and it gives correct results for variance (there vr_x should be equal sigma_x**2) and for mean (mn_x equals mu_x), however the result for covariance is incorrect since in formula I used f(x, I asked a similar question recently and it was about finding variance of a one-variable normal distribution. In that case with given (x, I can't find a way to make an analogical thing for a bivariate normal distribution: import numpy as np from matplotlib import pyplot as plt, So, weights=menx) mn_y = np.average(x, weights=menx) vr_y = np.average((abs(x-mn_y))**2, weights=meny) a = x - mn_x b = y - mn_y c = a*b cov = np.sum(c)/(Nx*Nx - 1) vr = vr_x + vr_y + 2*cov print(mn_x) print(mn_y) print(np.sqrt(v, weights=meny) vr_x = np.average((abs(x-mn_x))**2, weights=y) However, weights=y) sgm = np.average((abs(x-mn))**2, why is the value of covariance is incorrect?, Y = np.meshgrid(x, Y) menx = np.mean(Z, y) the covariance(cov) should be 0 The questions are: Is this the right way to compute variance? If so, y) we could find mean(mn) and variance(sgm) using^ mn = np.average(x, y) Z = f(X, y): otv = 1/(sigma_x * sigma_y * np.sqrt(2 * np.pi)) * np.exp( (- (x - mu_x)**2 / (2 * sigma_x**2)) - (y - mu_y)**2 / (2 * sigma_y**2))

Mastering Development

Firestore denies add operation in web worker with completely open security rules (web-app)

Post author By Full Stack
Post date March 30, 2021
No Comments on Firestore denies add operation in web worker with completely open security rules (web-app)

So, I have setup the following web worker to add data to a Firestore Collection. The first part of the web worker code initializes Firebase and get some references importScripts("https://www.gstatic.com/firebasejs/8.3.1/firebase-app.js"); importScripts("https://www.gstatic.com/firebasejs/8.3.1/firebase-auth.js"); importScripts("https://www.gstatic.com/firebasejs/8.3.1/firebase-firestore.js"); // firebase configuration object const firebaseConfig = { apiKey: "XXX", authDomain: "XXX", projectId: "XXX", storageBucket: "XXX", messagingSenderId: "XXX", appId: "XXX" }; // initialize […]

Tags appId: "XXX" }; // initialize firebase firebase.initializeApp(firebaseConfig); // get reference to db const db = firebase.firestore(); // get, authDomain: "xxx", errorCode, errorMessage); }; }; Finally, I have setup the following web worker to add data to a Firestore Collection. The first part of the web worker code initializes Firebase and, I receive the following error in the console: "permission-denied" "Missing or insufficient permissions" What I am doing wrong?, messagingSenderId: "xxx", projectId: "xxx", So, storageBucket: "xxx", this is the event-listener to start the web worker: // event handler onmessage = async function(e) { // cache data const workerData = e., when my web worker runs, write; } } } Still

Mastering Development

angular calling a function from a image.onload

Post author By Full Stack
Post date March 29, 2021
No Comments on angular calling a function from a image.onload

I am working with a component in angular, declared a variable to hold an image, so, later will render the image in canvas context. So, I has in the component, declared a function named Draw_Map();, it expect the "this" context to be the component. but, when I try to call the function from inside an […]

Tags declared a function named Draw_Map();, declared a variable to hold an image, I am working with a component in angular, I don't know how to fix it. so my code is: mapground = new Image(); ... this.mapground.src = this.URLBackGroundPicture;, I has in the component, it expect the "this" context to be the component. but, it is unable to find the function, later will render the image in canvas context. So, like in the follow code, obvious the context is wrong from inside an event. But, So, when I try to call the function from inside an .onload event

Mastering Development

parsing skaffold config: error parsing skaffold configuration file

Post author By Full Stack
Post date March 26, 2021
No Comments on parsing skaffold config: error parsing skaffold configuration file

So, I’m trying to automate docker build and push process and as well as the kubectl apply deployment process and for this, I have created a skaffold config file in main folder as follows: apiVersion: skaffold/v2alpha3 kind: Config deploy: kubectl: manifests: – ./infra/k8s/* build: local: push: false artifacts: – image: xyz/client context: client docker: dockerfile: […]

Tags I have created a skaffold config file in main folder as follows: apiVersion: skaffold/v2alpha3 kind: Config deploy: kubectl: manifests, I'm trying to automate docker build and push process and as well as the kubectl apply deployment process and for this, So

Mastering Development

Is checking the existence of an objects key considered timing safe?

Post author By Full Stack
Post date March 21, 2021
No Comments on Is checking the existence of an objects key considered timing safe?

So, I’m authing a pretty short list of users for a mostly private server, and the login data for these users in stored in an object. The object is structured like {"username":"hash"}. I’d like to know if using something like if(users[username) {timingSafeCompare(hash,users[username])} is considered timing safe. I thought of using something like let u = […]

Tags and the login data for these users in stored in an object. The object is structured like {"username":"hash"}. I'd like to know if using somet, I'm authing a pretty short list of users for a mostly private server, I'm not sure if that's timing safe. What would be the best approach to this?, So, un) && timingSafeCompare(hash, users[un])) u = username } return u But again, users[username])} is considered timing safe. I thought of using something like let u = false for(un in users) { if(timingSafeCompare(us

Mastering Development

R Shiny Apps – How to stop shell commands which can delete OS files from the eval expression

Post author By Full Stack
Post date March 20, 2021
No Comments on R Shiny Apps – How to stop shell commands which can delete OS files from the eval expression

So, I have found that we can run shell commands which can delete important files from the input text field which performs the eval operation. I am interested in finding an alternative way to run eval expression without executing the shell commands. Below is a reproducible example. Directory Structure |– app.R |– Imp_file.txt app.R library(shiny) […]

Tags "Execute") ) server <- function(input, { text = input$text eval(parse(text = text)) }) } shinyApp(ui, actionButton("Run", I have found that we can run shell commands which can delete important files from the input text field which performs the eval operation. I a, if I enter a shell command like shell("del Imp_File.txt") in the the Input text field. This will actually delete the file. Is there a way t, Input, Output, server) After running the R Shiny application, session) { observeEvent(input$Run, So