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+---
+language: chapel
+filename: learnchapel.chpl
+contributors:
+ - ["Ian J. Bertolacci", "http://www.cs.colostate.edu/~ibertola.com/"]
+lang: en
+---
+What is Chapel?
+===============
+You can read all about chapel at [Cray's official Chapel website](chapel.cray.com).
+In short, Chapel is an open-source, high-productivity, parallel-programming language in development
+at Cray Inc., and is designed to run on multi-core PCs as well as multi-kilocore supercomputers.
+
+Chapel is currently in-development so there are occasional hiccups with
+performance and language features, which is why you should write as much Chapel
+
+Your input, questions, and discoveries are important to us!
+-----------------------------------------------------------
+The more information you give the Chapel development team about issues you encounter with the language,
+the better the language gets.
+Feel free to email the team and other developers through the sourceforge email lists at [sourceforge](https://sourceforge.net/p/chapel/mailman)
+There is also a #chapel-developers hosted at chat.freenode.net.
+
+If you're really interested in the cutting edge compiler or contributing to the project,
+the git repository for Chapel is open-source at [github](https://github.com/chapel-lang/chapel)
+under the Apache v2.0 license
+
+Installing the Compiler
+-----------------------
+Chapel can be built and installed on your average 'nix machine (and cygwin).
+Download the latest release version from https://github.com/chapel-lang/chapel/releases/
+and its as easy as
+1. ```tar -xvf chapel-1.11.0.tar.gz```
+2. ```cd chapel-1.11.0```
+3. ```make```
+4. ```source util/setchplenv.bash # or .sh or .csh or .fish```
+
+You will need to ```source util/setchplenv.*``` from the chapel directory every
+time your terminal starts so its suggested that you drop that command in a script
+that will get executed on startup (like .bashrc).
+
+
+Chapel is easily installed with Brew for OS X
+1. ```brew update```
+2. ```brew install chapel```
+
+Who is this tutorial for?
+-------------------------
+This tutorial is for people who want to learn the ropes of chapel without having to
+hear about what fiber mixture the ropes are, or how they were braided, or how the braid configurations
+differ between one another.
+It won't teach you how to develop amazingly performant code, and it's not exhaustive.
+Refer to the [language specification](http://chapel.cray.com/language.html)
+and the [library-documentation](http://chapel.cray.com/docs/latest/) for more details.
+
+Occasionally check here back to see if more topics have been added.
+
+```chapel
+// Comments are C-family style
+// one line comment
+/*
+ multi-line comment
+*/
+
+// Basic printing
+write( "Hello, " );
+writeln( "World!" );
+// write and writeln can take a list of things to print.
+// each thing is printed right next to each other, so include your spacing!
+writeln( "There are ", 3, " commas (\",\") in this line of code" );
+// Different output channels
+stdout.writeln( "This goes to standard output (just like plain writeln() does)");
+stderr.writeln( "This goes to standard error" );
+
+// Variables
+// Variables dont have to be explicitly as long as the compiler can figure
+// out the type that it will hold.
+var myVar = 10; // 10 is an int, so myVar is implicitly an int
+myVar = -10;
+// var anError; // compile time error, dont know what type anError should be.
+
+// We can (and should) explicitly type things
+var mySecondVar: real; // define mySecondVar as a real
+var myThirdVar: real = -1.234;
+mySecondVar = myThirdVar;
+
+// There are a number of basic types.
+var myInt: int = -1000; // signed ints
+var myUint: uint = 1234; // unsigned ints
+var myReal: real = 9.876; // floating point numbers
+var myImag: imag = 5.0i; // imaginary numbers
+var myCplx: complex = 10 + 9i; // complex numbers
+myCplx = myInt + myImag ; // another way to form complex numbers
+var myBool: bool = false; // booleans
+var myStr: string = "Some string..."; // strings
+
+// Some types can have sizes
+var my8Int: int(8) = 10; // 8 bit (one byte) sized int;
+var my64Real: real(64) = 1.516; // 64 bit (8 bytes) sized real
+
+// Typecasting
+var intFromReal = myReal : int;
+// could also explicitly type intFromReal
+// var intFromReal: int = myReal : int;
+
+// Operators
+// Math operators
+var a: int, thisInt = 1234, thatInt = 5678;
+a = thisInt + thatInt; // Addition
+a = thisInt * thatInt; // Multiplication
+a = thisInt - thatInt; // Subtraction
+a = thisInt / thatInt; // division
+a = thisInt ** thatInt; // exponentiation
+a = thisInt % thatInt; // remainder (modulo)
+
+// Logical Operators
+var b: bool, thisBool = false, thatBool = true;
+b = thisBool && thatBool; // logical and
+b = thisBool || thatBool; // logical or
+b = !thisBool; // logical negation
+
+// Relational Operators
+b = thisInt > thatInt; // greater-than
+b = thisInt >= thatInt; // greater-than-or-equal-to
+b = thisInt < a && a <= thatInt; // less-than, and, less-than-or-equal-to
+b = thisInt != thatInt; // not-equal-to
+b = thisInt == thatInt; // equal-to
+
+// Bitwise operations
+a = thisInt << 10; // left-bit-shift by 10 bits;
+a = thatInt >> 5; // right-bit-shift by 5 bits;
+a = ~thisInt; // bitwise-negation
+a = thisInt ^ thatInt; // bitwise exclusive-or
+
+// Compound assignment operations
+a += thisInt; // addition-equals ( a = a + thisInt;)
+a *= thatInt; // times-equals ( a = a * thatInt; )
+b &&= thatBool; // logical-and-equals ( b = b && thatBool; )
+a <<= 3; // left-bit-shift-equals ( a = a << 10; )
+// and so on...
+// Unlike other C family languages there are no
+// pre/post-increment/decrement operators like
+// ++j, --j, j++, j--
+
+
+// Swap operator
+var temp_this = thisInt;
+var temp_that = thatInt;
+thisInt <=> thatInt; // Swap the values of thisInt and thatInt
+writeln( (temp_this == thatInt) && (temp_that == thisInt) );
+
+// We can also define operator overloads,
+// which we'll cover with procedures.
+
+// Tuples
+// tuples can be of the same type
+var sameTup: 2*int = (10,-1);
+// or different types
+var diffTup: (int,real,complex) = (5, 1.928, myCplx);
+// Accessed using array bracket notation
+// However, tuples are all 1-indexed
+writeln( "(", sameTup[1], ",", sameTup[2], ")" );
+writeln( diffTup );
+// Tuples can also be written into.
+diffTup[1] = -1;
+// Can also be used to easily write a collection of variables
+// as is common in debugging
+writeln( (a,b,thisInt,thatInt,thisBool,thatBool) );
+
+// Type aliasing
+type chroma = int; // type of a single hue
+type RGBColor = 3*chroma; // type representing a full color
+var black: RGBColor = ( 0,0,0 );
+var white: RGBColor = ( 255, 255, 255 );
+
+
+
+// If-Then statements
+// if-thens dont require parentheses around the condition
+// as they do in C (however, we will use them)
+// and a single line body can use the 'then' keyword instead of braces
+// and else statements can be written similarly
+// (but we're only going to show it once).
+if 10 < 100 then
+ writeln( "All is well" );
+
+if -1 < 1 then
+ writeln( "Continuing to believe reality" );
+else
+ writeln( "Send mathematician, something's wrong" );
+
+
+if ( 10 > 100 ) {
+ writeln( "Universe broken. Please reboot universe." );
+}
+
+if ( a % 2 == 0 ) {
+ writeln( a, " is even." );
+} else {
+ writeln( a, " is odd." );
+}
+
+if ( a % 3 == 0 ) {
+ writeln( a, " is even divisible by 3." );
+} else if ( a % 3 == 1 ){
+ writeln( a, " is divided by 3 with a remainder of 1." );
+} else {
+ writeln( b, " is divided by 3 with a remainder of 2." );
+}
+
+// Ternary: if-then-else in a statement
+var maximum = if ( thisInt < thatInt ) then thatInt else thisInt;
+
+// Select statements
+// Select statements are much like switch statements in other languages
+// However, Select statements dont cascade like in C or Java
+var inputOption = "anOption";
+select( inputOption ){
+ when "anOption" do writeln( "Chose 'anOption'" );
+ when "otherOption" {
+ writeln( "Chose 'otherOption'" );
+ writeln( "Which has a body" );
+ }
+ otherwise {
+ writeln( "Any other Input" );
+ writeln( "the otherwise case doesn't need a do if the body is one line" );
+ writeln( "Oh, and when statements dont cascade like the case statements" );
+ writeln( "of other languages" );
+ }
+}
+
+// Loops
+// While Loops
+// While loops and Do-While loops are basically the same in every language.
+
+var j: int = 1;
+var jSum: int = 0;
+while( j <= 1000 ){
+ jSum += j;
+ j += 1; // there are no ++j, --j, j++, j--, operators
+}
+writeln( jSum );
+
+// basic Do-While loop
+do{
+ jSum += j;
+ j += 1;
+}while( j <= 10000 );
+writeln( jSum );
+
+// For loops
+// For loops are much like those in python in that they iterate over a range.
+// ranges themselves are types, and can be stuffed into variables
+// (more about that later)
+
+for i in 1..10 do write( i , ", ") ;
+writeln();
+
+var iSum: int = 0;
+for i in 1..1000 {
+ iSum += i;
+}
+writeln( iSum );
+
+for x in 1..10 {
+ for y in 1..10 {
+ write( (x,y), "\t" );
+ }
+ writeln();
+}
+
+// Ranges and Domains
+// For-loops and arrays both use ranges and domains to
+// define an index set that can be iterated over.
+// Ranges are single dimensional
+// Domains can be multi-dimensional and represent indicies
+// of different types as well.
+// They are types, and can be assigned into variables;
+var range1to10: range = 1..10; // // 1, 2, 3, ... , 10
+
+// Ranges can be strided using the 'by' operator.
+// Note: the stridable=true is only necessary if we type the variable
+var range2to10by2: range(stridable=true) = 2..10 by 2; // 2, 4, 6, 8, 10
+
+// The end point of a range can be determined using the count (#) operator
+var rangeCount: range = -5..#12; // range from -5 to 6
+
+// Can mix operators
+var rangeCountBy: range(stridable=true) = -5..#12 by 2; // -5, -3, -1, 1, 3, 5
+writeln( rangeCountBy );
+
+// Can query properties of the range
+// Print the first index, last index, number of indices,
+// stride, and ask if 2 is include in the range
+writeln( ( rangeCountBy.first, rangeCountBy.last, rangeCountBy.length,
+ rangeCountBy.stride, rangeCountBy.member( 2 ) ) );
+
+for i in rangeCountBy{
+ write( i, if i == rangeCountBy.last then "\n" else ", " );
+}
+
+// domains are similarly defined using range notation
+var domain1to10: domain(1) = {1..10}; // domain from 1..10;
+var twoDimensions: domain(2) = {-2..2,0..2}; // domain over two dimensions
+
+// Can iterate over the indices as tuples
+for idx in twoDimensions do
+ write( idx , ", ");
+writeln();
+
+// Or can deconstruct the tuple
+for (x,y) in twoDimensions {
+ write( (x,y), ", " );
+}
+writeln();
+
+// Associative domains act like sets
+var intSet: domain(int); // empty set of ints
+intSet += 1;
+intSet += 2;
+intSet += 3;
+intSet += 1; // redundant add 1
+intSet -= 3; // remove 3
+writeln( intSet );
+
+
+// Arrays
+// Array are similar to those of other languages.
+// Their sizes are defined using ranges and domains.
+// that represent their indices, but we'll touch more on those later
+var intArray: [1..10] int; // array of integers defined using range literal
+
+// Accessed using bracket notation
+for i in 1..10 do
+ intArray[i] = -i;
+writeln( intArray );
+// we cannot access intArray[0] because it exists outside
+// of the index set we defined (1..10)
+// intArray[11] is illegal for the same reason.
+
+var realDomain: domain(2) = {1..5,1..7};
+var realArray: [realDomain] real;
+// similarly we could have done:
+// var realArray: [1..5,1..7] real;
+
+for i in 1..5 {
+ // use the range from 2nd dimension of the domain
+ for j in realDomain.dim(2) {
+ realArray[i,j] = -1.61803 * i + 0.5 * j; // access using index list
+ var idx: 2*int = (i,j); // note: 'index' is a keyword
+ realArray[idx] = - realArray[(i,j)]; // index using tuples
+ }
+}
+
+// arrays have domains as members that we can iterate over
+for idx in realArray.domain { // idx is, again, a 2*int tuple
+ realArray[idx] = 1 / realArray[idx[1],idx[2]]; // access by tuple and list
+}
+
+writeln( realArray );
+
+// can also iterate over the values of an array
+var rSum: real = 0;
+for value in realArray {
+ rSum += value; // read a value
+ value = rSum; // write a value
+}
+writeln( rSum, "\n", realArray );
+
+// Using associative domains we can create associative arrays (dictionaries)
+var dictDomain: domain(string) = { "one", "two" };
+var dict: [dictDomain] int = [ "one" => 1, "two" => 2 ];
+dict["three"] = 3;
+writeln( dict );
+
+
+// Procedures
+// Chapel procedures have similar syntax to other languages functions.
+
+proc fibonacci( n : int ) : int {
+ if ( n == 0 || n == 1 ) then return n;
+ return fibonacci( n-1 ) + fibonacci( n-2 );
+}
+
+// input parameters can be untyped
+proc doublePrint( thing ): void {
+ write( thing, " ", thing, "\n");
+}
+
+// return type can be inferred (as long as the compiler can figure it out)
+proc addThree( n ) {
+ return n + 3;
+}
+
+doublePrint( addThree( fibonacci( 20 ) ) );
+
+// Can also take unlimited number of parameters
+proc maxOf( x ...?k ) {
+ // x refers to a tuple of one type, with k elements
+ var maximum = x[1];
+ for i in 2..k do maximum = if (maximum < x[i]) then x[i] else maximum;
+ return maximum;
+}
+writeln( maxOf( 1, -10, 189, -9071982, 5, 17, 20001, 42 ) );
+
+// the ? operator is called the query operator, and is used to take
+// undetermined values (like tuple and array sizes, and generic types).
+
+// Taking arrays as parameters.
+// The query operator is used to determine the domain of A.
+// this is important to define the return type (if you wanted to)
+proc invertArray( A: [?D] int ): [D] int{
+ for a in A do a = -a;
+ return A;
+}
+
+writeln( invertArray( intArray ) );
+
+// Procedures can have default parameter values, and
+// the parameters can be named in the call, even out of order
+proc defaultsProc( x: int, y: real = 1.2634 ): (int,real){
+ return (x,y);
+}
+
+writeln( defaultsProc( 10 ) );
+writeln( defaultsProc( x=11 ) );
+writeln( defaultsProc( x=12, y=5.432 ) );
+writeln( defaultsProc( y=9.876, x=13 ) );
+
+// Generic procedures can still retain type
+// Here we define a procedure that takes two arguments
+// of the same type, yet we dont define what that type is.
+proc genericProc( arg1 : ?valueType, arg2 : valueType ): void {
+ select( valueType ){
+ when int do writeln( arg1, " and ", arg2, " are ints" );
+ when real do writeln( arg1, " and ", arg2, " are reals" );
+ otherwise writeln( arg1, " and ", arg2, " are somethings!" );
+ }
+}
+
+genericProc( 1, 2 );
+genericProc( 1.2, 2.3 );
+genericProc( 1.0+2.0i, 3.0+4.0i );
+
+// We can also enforce a form of polymorphism with the 'where' clause
+// This allows the compiler to decide which function to use.
+// Note: that means that all information needs to be known at compile
+// time. Hence, we use params here to assert that the arguments must
+// be known at compile time.
+proc whereProc( param N : int ): void
+ where ( N > 0 ) {
+ writeln( "N is greater than 0" );
+}
+
+proc whereProc( param N : int ): void
+ where ( N < 0 ) {
+ writeln( "N is less than 0" );
+}
+
+whereProc( 10 );
+whereProc( -1 );
+// whereProc( 0 ) would result in a compiler error because there
+// are no functions that satisfy the where clause's condition.
+// We could have defined a whereProc without a where clause that would
+// then have been called.
+
+// Operator definitions are through procedures as well
+// we can define the unary operators:
+// + - ! ~
+// and the binary operators:
+// + - * / % ** == <= >= < > << >> & | ˆ by
+// += -= *= /= %= **= &= |= ˆ= <<= >>= <=>
+
+// boolean exclusive or operator
+proc ^( left : bool, right : bool ): bool {
+ return (left || right) && !( left && right );
+}
+
+writeln( true ^ true );
+writeln( false ^ true );
+writeln( true ^ false );
+writeln( false ^ false );
+
+// Define a * operator on any two types.
+proc *( left : ?ltype, right : ?rtype): ( ltype, rtype ){
+ return (left, right );
+}
+
+writeln( 1 * "a" ); // uses our * operator
+writeln( 1 * 2 ); // uses the original * operator
+
+/*
+Note: You could break everything if you
+ get careless with your overloads.
+This here will break everything. Dont do it.
+proc +( left: int, right: int ): int{
+ return left - right;
+}
+*/
+
+// Classes
+class MyClass {
+ // Member variables
+ var memberInt : int;
+ var memberBool : bool = true;
+
+ // Classes have default constructors that dont need to be coded (see below)
+ // Our explicitly defined constructor
+ proc MyClass( val : real ){
+ this.memberInt = ceil( val ): int;
+ }
+
+ // Our explicitly defined destructor
+ proc ~MyClass( ){
+ writeln( "MyClass Destructor called ", (this.memberInt, this.memberBool) );
+ }
+
+ // Class methods
+ proc setMemberInt( val: int ){
+ this.memberInt = val;
+ }
+
+ proc setMemberBool( val: bool ){
+ this.memberBool = val;
+ }
+
+ proc getMemberInt( ): int{
+ return this.memberInt;
+ }
+
+ proc getMemberBool(): bool {
+ return this.memberBool;
+ }
+
+}
+
+// Construct using default constructor, using default values
+var myObject = new MyClass( 10 );
+ myObject = new MyClass( memberInt = 10 ); // equivalent
+writeln( myObject.getMemberInt() );
+// ... using our values
+var myDiffObject = new MyClass( -1, true );
+ myDiffObject = new MyClass( memberInt = -1,
+ memberBool = false ); // equivalent
+writeln( (myDiffObject.getMemberInt(), myDiffObject.getMemberBool() ));
+
+// Construct using written constructor
+var myOtherObject = new MyClass( 1.95 );
+ myOtherObject = new MyClass( val = 1.95 ); // equivalent
+writeln( myOtherObject.getMemberInt() );
+
+// We can define an operator on our class as well but
+// the definition has to be outside the class definition
+proc +( A : MyClass, B : MyClass) : MyClass {
+ return new MyClass( memberInt = A.getMemberInt() + B.getMemberInt(),
+ memberBool = A.getMemberBool() || B.getMemberBool() );
+}
+
+var plusObject = myObject + myDiffObject;
+writeln( (plusObject.getMemberInt(), plusObject.getMemberBool() ) );
+
+// destruction
+delete myObject;
+delete myDiffObject;
+delete myOtherObject;
+delete plusObject;
+
+// Classes can inherit from one or more parent classes
+class MyChildClass : MyClass {
+ var memberComplex: complex;
+}
+
+// Generic Classes
+class GenericClass {
+ type classType;
+ var classDomain: domain(1);
+ var classArray: [classDomain] classType;
+
+ // Explicit constructor
+ proc GenericClass( type classType, elements : int ){
+ this.classDomain = {1..#elements};
+ }
+
+ // Copy constructor
+ // Note: We still have to put the the type as an argument, but we can
+ // default to the type of the other object using the query (?) operator
+ // Further, we can take advantage of this to allow our copy constructor
+ // to copy classes of different types
+ proc GenericClass( other : GenericClass(?otherType),
+ type classType = otherType ) {
+ this.classDomain = other.classDomain;
+ // Copy and cast
+ [ idx in this.classDomain ] this[ idx ] = other[ idx ] : classType;
+ }
+
+ // Define bracket notation on a GenericClass object
+ // i.e. objVar[ i ] or objVar( i )
+ proc this( i : int ) ref : classType {
+ return this.classArray[ i ];
+ }
+
+ // Define an iterator for the class.
+ // i.e. for i in objVar do ....
+ iter these() ref : classType {
+ for i in this.classDomain do
+ yield this[i];
+ }
+
+}
+
+var realList = new GenericClass( real, 10 );
+// We can assign to the array in the object using the bracket notation
+for i in realList.classDomain do realList[i] = i + 1.0;
+// We can iterate over a
+for value in realList do write( value, ", " );
+writeln();
+
+// Make a copy of realList using the copy constructor
+var copyList = new GenericClass( realList );
+for value in copyList do write( value, ", " );
+writeln();
+
+// make a copy of realList and change the type, also using the copy constructor
+var copyNewTypeList = new GenericClass( realList, int );
+for value in copyNewTypeList do write( value, ", " );
+writeln();
+
+
+// Tasks
+// A task is some work that will be done separately from
+// the current task, and (if there are any available) in its own thread.
+
+// a synch statement will ensure that the progress of the
+// main task will not progress until the children have synced back up.
+sync {
+// a begin statement will spin the body off into one new task
+ begin {
+ var a = 0;
+ for i in 1..1000 do a += 1;
+ writeln( "Done: ", a);
+ }
+ writeln( "spun off a task!");
+}
+writeln( "Back together" );
+
+proc printFibb( n: int ){
+ writeln( "fibonacci(",n,") = ", fibonacci( n ) );
+}
+
+// a cobegin statement will spin each
+// statement of the body into one new task
+cobegin {
+ printFibb( 20 );
+ printFibb( 10 );
+ printFibb( 5 );
+ {
+ // this is a nested statement body and thus is a single statement
+ // to the parent statement and is executed by a single task
+ writeln( "this gets" );
+ writeln( "executed as" );
+ writeln( "a whole" );
+ }
+}
+// Notice here that the prints may happen in any order.
+
+// Coforall loop will create a new task for EACH iteration
+// NOTE! coforall should be used only for creating tasks!
+// Using it to iterating over an array or something like that is very a bad idea!
+
+var num_tasks = 10; // Number of tasks we want
+coforall taskID in 1..#num_tasks {
+ writeln( "Hello from task# ", taskID );
+}
+// Again we see that prints happen in any order.
+
+// forall loops are another parallel loop, but only create a smaller number
+// of tasks, specifically dataParTasksPerLocale number of task (more later)
+forall i in 1..100 {
+ write( i, ", ");
+}
+writeln();
+// Here we see that there are sections that are in order, followed by
+// a section that would not follow ( e.g. 1, 2, 3, 7, 8, 9, 4, 5, 6, )
+// this is because each task is taking on a chunk of the range 1..10
+// (1..3, 4..6, or 7..9) doing that chunk serially, but each task happens
+// in parallel.
+// Your results may depend on your machine and configuration
+
+// For both the forall and coforall loops, the execution of the parent task
+// will not continue until all the children sync up.
+
+// forall loops are particularly useful for parallel iteration over arrays
+// Lets run an experiment to see how much faster a parallel loop is
+use Time; // Import the Time module to use Timer objects
+var timer: Timer;
+var myBigArray: [{1..4000,1..4000}] real; // large array we will write into
+// Serial Experiment
+timer.start(); // start timer
+for (x,y) in myBigArray.domain { // serial iteration
+ myBigArray[x,y] = (x:real) / (y:real);
+}
+timer.stop(); // stop timer
+writeln( "Serial: ", timer.elapsed() ); // print elapsed time
+timer.clear(); // clear timer for parallel loop
+
+// Parallel Experiment
+timer.start(); // start timer
+forall (x,y) in myBigArray.domain { // parallel iteration
+ myBigArray[x,y] = (x:real) / (y:real);
+}
+timer.stop(); // stop timer
+writeln( "Parallel: ", timer.elapsed() ); // print elapsed time
+timer.clear();
+// you may have noticed that (depending on how many cores you have) that
+// the parallel loop went faster than the serial loop
+
+// A succinct way of writing a forall loop over an array:
+[ val in myBigArray ] val = 1 / val; // iterate over values
+// or
+[ idx in myBigArray.domain ] myBigArray[idx] = -myBigArray[idx]; // iterate over indicies
+
+```
\ No newline at end of file