Tutorial by Examples: o

A set of high-level mapping functions is available in Common Lisp, to apply a function to the elements of one or more lists. They differ in the way in which the function is applied to the lists and how the final result is obtained. The following table summarize the differences and shows for each of ...

MAPCAR is the most used function of the family: CL-USER> (mapcar #'1+ '(1 2 3)) (2 3 4) CL-USER> (mapcar #'cons '(1 2 3) '(a b c)) ((1 . A) (2 . B) (3 . C)) CL-USER> (mapcar (lambda (x y z) (+ (* x y) z)) '(1 2 3) '(10 20 30) '(1...

CL-USER> (maplist (lambda (list) (cons 0 list)) '(1 2 3 4)) ((0 1 2 3 4) (0 2 3 4) (0 3 4) (0 4)) CL-USER> (maplist #'append '(a b c d -) '(1 2 3)) ((A B C D - 1 2 3) (B C D - 2 3) (C D - 3))

MAPCAN: CL-USER> (mapcan #'reverse '((1 2 3) (a b c) (100 200 300))) (3 2 1 C B A 300 200 100) CL-USER> (defun from-to (min max) (loop for i from min to max collect i)) FROM-TO CL-USER> (from-to 1 5) (1 2 3 4 5) CL-USER> (mapcan #'from-to '(1 2 3) '(5 5 5)) (1 2 3 4 5...

MAPC: CL-USER> (mapc (lambda (x) (print (* x x))) '(1 2 3 4)) 1 4 9 16 (1 2 3 4) CL-USER> (let ((sum 0)) (mapc (lambda (x y) (incf sum (* x y))) '(1 2 3) '(100 200 300)) sum) 1400 ; => (1 x 100) + (2 x 200) + (3 x 30...

After installing gnuplot it's a good idea to run a simple example to ensure all is working fine. Open your terminal Type gnuplot. Your prompt should now change to gnuplot> Type: plot sin(x) If all is well you should see now a sin(x) graphic generated by gnuplot. Note: if you are on Wind...

#include <omp.h> #include <stdio.h> int main (int argc, char *argv[]) { #pragma omp parallel { printf ("Hello world! I'm thread %d out of %d threads.\n", omp_get_thread_num(), omp_get_num_threads()); } return 0; } This code simply ...

The per-directory context is a part of the static configuration file between <Directory> and </Directory> tags. The entire content of dynamic configuration files is within the per-directory context of the folder in which the .htaccess resides. RewriteRule's in per-directory context matc...

The virtual host context is a part of the static configuration file between <VirtualHost> and </VirtualHost> tags. RewriteRule's in virtual host context match against the part of an url after the protocol, hostname and port, and before the query string. When the following rule is used ...

As mentioned in "Remarks", a partition is a part/slice/chunk of an RDD. Below is a minimal example on how to request a minimum number of partitions for your RDD: In [1]: mylistRDD = sc.parallelize([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 2) In [2]: mylistRDD.getNumPartitions() Out[2]: 2 No...

Sometimes we want to repartition an RDD, for example because it comes from a file that wasn't created by us, and the number of partitions defined from the creator is not the one we want. The two most known functions to achieve this are: repartition(numPartitions) and: coalesce(numPartitions, s...

As rule of thumb, one would want his RDD to have as many partitions as the product of the number of executors by the number of used cores by 3 (or maybe 4). Of course, that's a heuristic and it really depends on your application, dataset and cluster configuration. Example: In [1]: data = sc.textF...

private static final String TAG = "IntentBitmapFetch"; private static final String COLON_SEPARATOR = ":"; private static final String IMAGE = "image"; @Nullable public Bitmap getBitmap(@NonNull Uri bitmapUri, int maxDimen) { InputStream is = context.getConten...

Let's make a hello world web script. Web scripts have a descriptor, a controller, and, optionally, a view. These files must follow a naming convention. This descriptor is named helloworld.get.desc.xml. <webscript> <shortname>Hello World</shortname> <description>Hello ...

The Hello World Web Script handles GET HTTP methods. But what if you want to create data on the server? For that your web script should handle POST. Here is a simple example that creates new folders in Company Home. It is invoked by making a POST call with a JSON body that looks like: {'name':'tes...

interface IGreeter { void Greet(); } class Greeter : IGreeter { public void Greet() { Console.WriteLine("Hello World"); } } class SpanishGreeter : IGreeter { public void Greet() { Console.WriteLine("Hola Mundo"); } ...

interface IService { void ProcessRequest(); } interface IRepository { IEnumerable<string> GetData(); } class HelloWorldRepository : IRepository { public IEnumerable<string> GetData() { return new[] { "Hello", "World" }; } ...

Dagger 2 supports creating a component from multiple modules. You can create your component this way: @Singleton @Component(modules = {GeneralPurposeModule.class, SpecificModule.class}) public interface MyMultipleModuleComponent { void inject(MyFragment myFragment); void inject(MyServic...

QRCodeReaderView implements an Android view which show camera and notify when there's a QR code inside the preview. It uses the zxing open-source, multi-format 1D/2D barcode image processing library. Adding the library to your project Add QRCodeReaderView dependency to your build.gradle dependen...

Variables in Go are always initialized whether you give them a starting value or not. Each type, including custom types, has a zero value they are set to if not given a value. var myString string // "" - an empty string var myInt int64 // 0 - applies to all types of int an...