FAQ Database Discussion Community

Convert Uint8ClampedArray to regular array

How can I convert a Uint8ClampedArray (like one used for storing HTML5 canvas image data) to a regular array, in which values won't be constrained to 0-255?

sum of uint8array javascript

I'm trying to sum and then average a stream of data, some code here. var getAverage = function(dataArray){ var total, sample = dataArray.length, eArray = Array.prototype.slice.call(dataArray); for (var i = 0; i< sample; i++) { total+= eArray[i]; } return total; } var output = function(){ //source data var dataArray =...

google places autocomplete api not working in android

I am using Google Places Autocomplete API in my android application. But the app doesn't work . The logcat is filled with these warnings. There is this warning regarding TypedArray which I think is creating the problem.Can anyone explain what may be the issue.The logcat content is given below. 02-02...

Getresource id Error

I am getting "Null pointer exception for getResourceID()". If someone suggest me where i am going wrong in coding. Error message: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.content.res.TypedArray.getResourceId(int, int)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390) at android.app.ActivityThread.access$800(ActivityThread.java:151) at...

TypedArray is empty after obtainTypedArray call

I have a simple google maps implementation, I'm filling two typed arrays with doubles from my strings.xml so I can use them to fill in as longitudes and latitudes. Here is the method: @Override public void onMapReady(GoogleMap map) { map.setMyLocationEnabled(true); TypedArray lats = getResources().obtainTypedArray(R.array.Lats); TypedArray longs = getResources().obtainTypedArray(R.array.Longs); int length...

Why does Node sometimes hang when allocating Int8Array?

Consider the following two programs: // works.js var buffer = new ArrayBuffer(16777216); var HEAP8 = new Int8Array(buffer); and // fails.js var HEAP8; var buffer = new ArrayBuffer(16777216); HEAP8 = new Int8Array(buffer); Run node then enter .load works.js. Everything seems happy. Now exit node. Run node again and enter .load fails.js....

Fill a typed array with .bin file content in Node.js

On my server file system I have a directory which contains some .bin file filled with 16 bit integers. How can I load a Uint16Array variable with the content of a specific .bin file in Node.js? I already tried: var arrayFromBinFile = new Uint16Array('./myDirectoryContainingBinFiles/selectedFile.bin') By using console.log in node.js all...

What is UInt8Array() max value?

I've been experimenting with UInt8Array() method in Javascript to create random numbers, and it works even better than Math.random(). However I would like to know what's the max value this method could generate, so I was wondering if someone more experienced could give this information and perhaps explain me how...

The best performant way to push items into array?

In my website i have many arrays with data. for example: vertices array, colors array, sizes array... I'm working with big amounts of items. Up to tens of millions. Before adding the data into the arrays I need to process it. Until now, I did it in the main thread...

Fastest way to aggregate two typed arrays in javascript [duplicate]

This question already has an answer here: How can I merge TypedArrays in JavaScript? 2 answers Hello everyone I'm trying to figure out the fastest way to aggregate two typed arrays into a single array. Imagine data looks like this [Int8Array, Int8Array] and I want to end up with...

Converting an Array of Hexadecimal Strings to Numbers

I have an application in which a server is sending a lot of data every second to clients that request it. In this data set are several (large) arrays that contain numbers (in some cases 16-bit integers and in others double precision floats). In order to reduce the packet size,...

Store typed array in ArrayBuffer

I have an ArrayBuffer of data which is composed of Uint8s. Each is in network byte order (big-endian). My goal is to convert each Uint8 into little-endian order, but then put them back in the ArrayBuffer. I know I can easily separate the individual Uints by using a typed array,...