Tutorial by Examples: e

scons describes running phases itself. Running it over an empty SConstruct yields this: $ scons scons: Reading SConscript files ... scons: done reading SConscript files. scons: Building targets ... scons: `.' is up to date. scons: done building targets. To suppress phase messages, add -Q op...

Prepare helloworld.go (find below) package main import "fmt" func main(){ fmt.Println("hello world") } Run GOOS=linux GOARCH=arm go build helloworld.go Copy generated helloworld (arm executable) file to your target machine.

Detailed instructions on getting coded-ui-tests set up or installed.

For-loop has no business being its own documentation page!

boolean has no business being its own documentation page!

Detailed instructions on getting Nokogiri set up or installed.

There isn't much to add to Nokogiri's "Parsing an HTML/XML Document" tutorial, which is an easy introduction to the subject, so start there, then return to this page to help fill in some gaps. Nokogiri's basic parsing attempts to clean up a malformed document, sometimes adding missing clo...

Nokogiri is somewhat like a browser, in that it will attempt to provide something useful even if the incoming HTML or XML is malformed. Unfortunately it usually does it silently, but we can ask for a list of the errors using errors: require 'nokogiri' doc = Nokogiri::XML('<node><foo/&gt...

How to correctly extract text from nodes is one of the most popular questions we see, and almost invariably is made more difficult by misusing Nokogiri's "searching" methods. Nokogiri supports using CSS and XPath selectors. These are equivalent: doc.at('p').text # => "foo"...

To read an array from the device back to the host, one calls clEnqueueReadBuffer($queue, $memobj, $blocking, $offset, $size, $target, 0, null, null); The $queue is the CommandQueue which was used to allocate the memory on the device. The $memobj contains the address to the device memory, $offset...

Reading an image is almost like reading an array. The only difference beeing that the size and offset need to be three-dimensional. clEnqueueReadImage($queue, $memobj, $blocking, $offset, $size, $stride, $slice_pitch, $target, 0, null, null); The $stride defines how many bytes a row has. Normall...

To copy a texture to the device there are two steps necessary Allocate the memory on the device Copy the image to the device _mem = clCreateImage2D($context, $mem_flags, $image_format, $width, $height, $stride, $source, &err); The $mem_flags define how the memory is allocated. It can...

When allocating Memory you have the option to choose between different modes: Read only memory Write only memory Read/Write memory Read-only memory is allocated in the __constant memory region, while the other two are allocated in the normal __global region. In addition to the accessibility...

Lets build a kernel to generate a grayscale image. We will use image data which is defined using uints for each component and with order RGBA. __constant sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE | CLK_ADDRESS_CLAMP_TO_EDGE | C...

Lets walk through the most simple kernel there is and some variations of it __kernel void myKernel() { } A kernel which can be started from your main code is identified by the __kernel keyword. A Kernel function can only have return type void. __kernel void myKernel(float a, uint b, byte c) { ...

To properly work with the data each thread needs to know its position in the threadblock/global thread pool. This can be archieved with get_local_id($dim); get_global_id($dim); Those two functions return the position of the thread relative to the threadblock or all threads. get_working_dim(); ...

Each fundamental opencl type has a vector version. You can use the vector type by appending the number of desired components after the type. Supported number of components are 2,3,4,8 and 16. OpenCL 1.0 does not offer three components. You can initialize any vector using two ways: Provide a sing...

Lets look at a gamma correction kernel __constant sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE | CLK_ADDRESS_CLAMP_TO_EDGE | CLK_FILTER_LINEAR; __kernel void Gamma(__read_only image2d_t input, __write_only image2d_t output, __c...

Recent versions of Delphi ships with the TStopwatch record which is for time interval measurement. Example usage: uses System.Diagnostics; var StopWatch: TStopwatch; ElapsedMillseconds: Int64; begin StopWatch := TStopwatch.StartNew; // do something that requires measurement El...

trait Show[T] { def show(t: T): String } object Show extends ProductTypeClassCompanion[Show] { def apply[T](implicit T: Show[T]) = T def from[T](f: T => String): Show[T] = new Show[T] { def show(t: T): String = f(t) } implicit val string = from[String](_.reverse) ...