I have some code which I think should look like:
on Locales[0] {
var slice: domain(1) = {0..#widthOfLocaleMatrix};
on Locales[1] {
slice(0) = A.localSubdomain();
}
var localSlice: [slice(0)] int = A[slice(0)];
}
Basically, I am trying to fetch multiple slices of data from the other numLocales - 1 locales. Can I create an object to store the localSubdomain's from all other locales? I think I can work around this, but I was curious.
To store multiple domains, you'll want to create an array of domains (or some other collection of domains). Specifically, the main problem with the code above is that it is seemingly trying to index into a domain ( slice(0) ) -- keep in mind that domains are merely index sets, not arrays/maps from indices to values.
The following sample program creates a distributed array ( A ) whose distribution we want to interrogate and an array of domains ( slicePerLocale ) that we'll use to keep track of who owns what. It populates slicePerLocale via the localSubdomain() query to determine the subdomain that each locale owns and stores that in the respective element of slicePerLocale. Finally, it prints out what it has learned:
use BlockDist;
config const n = 10;
var D = {1..n, 1..n} dmapped Block({1..n, 1..n});
var A: [D] real;
var slicePerLocale: [LocaleSpace] domain(2);
coforall loc in Locales do
on loc do
slicePerLocale[loc.id] = A.localSubdomain();
for (loc, slice) in zip(LocaleSpace, slicePerLocale) do
writeln("locale ", loc, " owns: ", slice);
Running this on four locales with the default problem size of 10 results in:
locale 0 owns: {1..5, 1..5}
locale 1 owns: {1..5, 6..10}
locale 2 owns: {6..10, 1..5}
locale 3 owns: {6..10, 6..10}
Related
Since two days I'm on a problem and I can't solve it so I come here to ask some help...
I have that bit of dax that basically take the path of a hierarchical table (integers) and take the string names of the 2 first in the path.
the names I use:
'HIERARCHY' the hierarchical table with names, id, path, nbrItems, string
mytable / addedcolumn1/2 the new table used to emulate the for loop
DisplayPath =
var __Path =PATH(ParentChild[id], ParentChild[parent_id])
var __P1 = PATHITEM(__Path,1) var __P2 = PATHITEM(__Path,2)
var l1 = LOOKUPVALUE(ParentChild[Place],ParentChild[id],VALUE(__P1))
var l2a = LOOKUPVALUE(ParentChild[Place],ParentChild[id],VALUE(__P2))
var l2 = if(ISBLANK(l2a), "", " -> " & l2a)
return CONCATENATE(l1,l2)
My problem is... I don't know the number of indexes in my path, can go from 0 to I guess 15...
I've tried some things but can't figure out a solution.
First I added a new column called nbrItems which calculate the number of items in the list of the path.
The two columns:
Then I added that bit of code that emulates a for loop depending on the number of items in the path list, and I'd like in it to
get name of parameters
concatenate them in one string that I can return and get
string =
var n = 'HIERARCHY'[nbrItems]
var mytable = GENERATESERIES(1, n)
var addedcolumn1 = ADDCOLUMNS(mytable, "nom", /* missing part: get name */)
var addedcolumn2 = ADDCOLUMNS(addedcolumn1, "string", /* missing part: concatenate previous concatenated and new name */)
var mymax = MAXX(addedcolumn2, [Value])
RETURN MAXX(FILTER(addedcolumn2, [Value] = mymax), [string])
Full table:
Thanks for your help in advance!
Ok, so after some research and a lot of try and error... I've came up to a nice and simple solution:
The original problem was that I had a hierarchical table ,but with all data in the same table.
like so
What I did was, adding a new "parent" column with this dax:
parent =
var a = 'HIERARCHY'[id_parent]
var b = CALCULATE(MIN('HIERARCHY'[libelle]), FILTER(ALL('HIERARCHY'), 'HIERARCHY'[id_h] = a))
RETURN b
This gets the parent name from the id_parent (ref. screen).
then I could just use the path function, not on the id's but on the names... like so:
path = PATH('HIERARCHY'[libelle], 'HIERARCHY'[parent])
It made the problem easy because I didn't need to replace the id's by there names after this...
and finally to make it look nice, I used some substitution to remove the pipes:
formated_path = SUBSTITUTE('HIERARCHY'[path], "|", " -> ")
final result
I'm trying to write some code that (pseudo-randomly) generates a list of 7 numbers. I have it working for a single run. I'd like to be able to loop this code to generate multiple lists, which I can output to a txt file (I don't need help with this I'm quite comfortable working with i/o and files :)
I'm now using this code (thanks Jason for getting it this far):
import random
pool = []
original_pool = list( range( 1,60))
def selectAndPrune(x):
pool = []
list1 = []
random.shuffle(pool)
pool = original_pool.copy()
current_choice = random.choice(pool)
list1.append(current_choice)
pool.remove(current_choice)
random.shuffle(pool)
print(list1)
def repeater():
for i in range(19):
pool_list = []
pool = original_pool.copy()
a = [ selectAndPrune(pool) for x in range(7)]
pool_list.append(a)
repeater()
This is giving output of single value lists like:
[21]
[1]
[54]
[48]
[4]
[32]
[15]
etc.
The output I want is 19 lists, all containing 7 random ints:
[1,4,17,23,45,51,3]
[10,2,9,38,4,1,24]
[15,42,35,54,43,28,14]
etc
If I am understanding the question correctly, the objective is to repeat a function 19 times. However, this function slowly removes items from the list at each call, making it impossible to run past the size of the pool as currently written in the question. I suspect that the solution is something like this:
import random
def spinAndPrune():
random.shuffle( pool )
current_choice = random.choice( pool )
pool.remove( current_choice )
random.shuffle( pool )
return current_choice
First, I added a return command at the end of the function call. Next, you can make copy of the original pool, so that it is possible to re-run it as many times as desired. Also, you need to store the lists you want to keep:
# create an original pool of values
original_pool = list( range( 1, 60 ) )
# initialize a variable that stores previous runs
pool_list = []
# repeat 19 times
for i in range( 19 ):
# create a copy of the original pool to a temporary pool
pool = original_pool.copy()
# run seven times, storing the current choice in variable a
a = [ spinAndPrune() for x in range( 7 ) ]
# keep track of variable a in the pool_list
pool_list.append( a )
print( a )
Note the .copy() function to make a copy of the list. As an aside, the range() makes it easy to create lists containing integers 1-59.
If you need to extract a specific list, you can do something along the lines of this:
# print first list
print( pool_list[ 0 ] )
# print fifth list
print( pool_list[ 4 ] )
# print all the lists
print( pool_list )
In my other answer, I approached it by modifying the code in the original question. However, if the point is just to extract X number of values without repeat in a collection/list, it is probably easiest to just use the random.sample() function. The code can be something along the lines of this:
import random
pool = list( range( 1, 60 ) )
pool_list = []
# sample 19 times and store to the pool_list
for i in range( 19 ):
sample = random.sample( pool, 7 )
pool_list.append( sample )
print( sample )
I have a map reduce view:
.....
emit( diffYears, doc.xyz );
reduced with _sum.
xyz is then a number which is summed per integer(diffYears).
The output looks roughly like this:
4 1204.9
5 796.19
6 1124.8
7 1112.6
8 1993.62
9 159.26
10 395.41
11 456.05
12 457.97
13 39.80
14 483.68
15 269.469
etc..
What I would like to do is group the results as follows:
Grouping Total per group
0-4 1959.2 i.e add up the xyz's for years 0,1,2,3,4
5-9 3998.5 same for 5,6,7,8,9 ...etc.
10-14 3566.3
I saw a suggestion where a list was used on a view output here: Using a CouchDB view, can I count groups and filter by key range at the same time?
but have been unable to adapt it to get any kind of result.
The code given is:
{
_id: "_design/authors",
views: {
authors_by_date: {
map: function(doc) {
emit(doc.date, doc.author);
}
}
},
lists: {
count_occurrences: function(head, req) {
start({ headers: { "Content-Type": "application/json" }});
var result = {};
var row;
while(row = getRow()) {
var val = row.value;
if(result[val]) result[val]++;
else result[val] = 1;
}
return result;
}
}
}
I substituted var val = row.key in this section:
while(row = getRow()) {
var val = row.value;
if(result[val]) result[val]++;
else result[val] = 1;
}
(although in this case the result is a count.)
This seems to be the way to do it.
(It is like having a startkey and endkey for each grouping which I can do manually, naturally, but not inside a process. Or is there a way of entering multiple start- and endkeys into one GET command???? )
This must be a fairly normal thing to do especially for researchers using statistical analysis.
I assume therefore that it does get done but I cannot locate examples
as far as CouchDB is concerned.
I would appreciate some help with this please or a pointer in the right direction.
Many thanks.
EDIT:
Perhaps the answer lies in a process in 'reduce' to group the output??
You can accomplish what you want using a complex key. The limitation is that the group size is static and needs to be defined in the view.
You'll need a simple step function to create your groups within map like:
var size = 5;
var group = ( doc.diffYears - (doc.diffYears % size)) / size;
emit( [group, doc.diffYears], doc.xyz);
The reduce function can remain _sum.
Now when you query the view use group_level to control the grouping. At group_level=0, everything will be summed and one value will be returned. At group_level=1 you'll receive your desired sums of 0-4, 5-9 etc. At group_level=2 you'll get your original output.
I'm trying to retrieve a value from an array, based on an index parsed from a string of digits. I'm stuck on this error, and the other answers to similar questions in this forum appear to be for more advanced developers (this is my first iOS app).
The app will eventually look up weather reports ("MAFOR" groupings of 5 digits each) from a web site, parse each group and lookup values from arrays for wind direction, speed, forecast period etc using each character.
The playground code is below, appreciate any help on where I am going wrong (look for ***)
//: Playground - noun: a place where people can play
import UIKit
var str = "Hello, playground"
// create array for Forecast Period
let forecastPeriodArray = ["Existing conditions at beginning","3 hours","6 hours","9 hours","12 hours","18 hours","24 hours","48 hours","72 hours","Occasionally"]
// create array for Wind Direction
let windDirectionArray = ["Calm","Northeast","East","Southeast","South","Southwest","West","Northwest","North","Variable"]
// create array for Wind Velocity
let windVelocityArray = ["0-10 knots","11-16 knots","17-21 knots","22-27 knots","28-33 knots","34-40 knots","41-47 knots","48-55 knots","56-63 knots","64-71 knots"]
// create array for Forecast Weather
let forecastWeatherArray = ["Moderate or good visibility (> 3 nm.","Risk of ice accumulation (temp 0C to -5C","Strong risk of ice accumulkation (air temp < -5C)","Mist (visibility 1/2 to 3 nm.)","Fog (visibility less than 1/2 nm.)","Drizzle","Rain","Snow, or rain and snow","Squally weather with or without showers","Thunderstorms"]
// retrieve full MAFOR line of several information groups (this will be pulled from a web site)
var myMaforLineString = "11747 19741 13757 19751 11730 19731 11730 13900 11630 13637"
// split into array components wherever " " is encountered
var myMaforArray = myMaforLineString.components(separatedBy: " ")
let count = myMaforArray.count
print("There are \(count) items in the array")
// Go through each group and parse out the needed digits
for maforGroup in myMaforArray {
print("MAFOR group \(maforGroup)")
// get Forecast Period
var idx = maforGroup.index(maforGroup.startIndex, offsetBy: 1)
var periodInt = maforGroup[idx]
print("periodInt is \(periodInt)")
// *** here is where I am stuck... trying to use the periodInt index value to retrieve the description from the ForecastPeriodArray
var periodDescription = forecastPeriodArray(periodInt)
print("Forecast period = (forecastPeriodArray(periodInt)")
// get Wind Direction
idx = maforGroup.index(maforGroup.startIndex, offsetBy: 2)
var directionInt = maforGroup[idx]
print("directionInt is \(directionInt)")
// get Wind Velocity
idx = maforGroup.index(maforGroup.startIndex, offsetBy: 3)
var velocityInt = maforGroup[idx]
print("velocityInt is \(velocityInt)")
// get Weather Forecast
idx = maforGroup.index(maforGroup.startIndex, offsetBy: 4)
var weatherInt = maforGroup[idx]
print("weatherInt is \(weatherInt)")
}
#shallowThought was close.
You are trying to access an array by its index, therefore use the array[index] notation. But your index has to be of the correct type. forecastPeriodArray[periodInt] therefore does not work since periodInt is not an Int as the name would suggest. Currently it is of type Character which does not make much sense.
What you are probably trying to achieve is convert the character to an integer and use that to access the array:
var periodInt = Int(String(maforGroup[idx]))!
You might want to add error handling for the case when the character does not actually represent an integer.
I am seeing a problem with some Scala 2.7.7 code I'm working on, that should not happen if it the equivalent was written in Java. Loosely, the code goes creates a bunch of card players and assigns them to tables.
class Player(val playerNumber : Int)
class Table (val tableNumber : Int) {
var players : List[Player] = List()
def registerPlayer(player : Player) {
println("Registering player " + player.playerNumber + " on table " + tableNumber)
players = player :: players
}
}
object PlayerRegistrar {
def assignPlayersToTables(playSamplesToExecute : Int, playersPerTable:Int) = {
val numTables = playSamplesToExecute / playersPerTable
val tables = (1 to numTables).map(new Table(_))
assert(tables.size == numTables)
(0 until playSamplesToExecute).foreach {playSample =>
val tableNumber : Int = playSample % numTables
tables(tableNumber).registerPlayer(new Player(playSample))
}
tables
}
}
The PlayerRegistrar assigns a number of players between tables. First, it works out how many tables it will need to break up the players between and creates a List of them.
Then in the second part of the code, it works out which table a player should be assigned to, pulls that table from the list and registers a new player on that table.
The list of players on a table is a var, and is overwritten each time registerPlayer() is called. I have checked that this works correctly through a simple TestNG test:
#Test def testRegisterPlayer_multiplePlayers() {
val table = new Table(1)
(1 to 10).foreach { playerNumber =>
val player = new Player(playerNumber)
table.registerPlayer(player)
assert(table.players.contains(player))
assert(table.players.length == playerNumber)
}
}
I then test the table assignment:
#Test def testAssignPlayerToTables_1table() = {
val tables = PlayerRegistrar.assignPlayersToTables(10, 10)
assertEquals(tables.length, 1)
assertEquals(tables(0).players.length, 10)
}
The test fails with "expected:<10> but was:<0>". I've been scratching my head, but can't work out why registerPlayer() isn't mutating the table in the list. Any help would be appreciated.
The reason is that in the assignPlayersToTables method, you are creating a new Table object. You can confirm this by adding some debugging into the loop:
val tableNumber : Int = playSample % numTables
println(tables(tableNumber))
tables(tableNumber).registerPlayer(new Player(playSample))
Yielding something like:
Main$$anon$1$Table#5c73a7ab
Registering player 0 on table 1
Main$$anon$1$Table#21f8c6df
Registering player 1 on table 1
Main$$anon$1$Table#53c86be5
Registering player 2 on table 1
Note how the memory address of the table is different for each call.
The reason for this behaviour is that a Range is non-strict in Scala (until Scala 2.8, anyway). This means that the call to the range is not evaluated until it's needed. So you think you're getting back a list of Table objects, but actually you're getting back a range which is evaluated (instantiating a new Table object) each time you call it. Again, you can confirm this by adding some debugging:
val tables = (1 to numTables).map(new Table(_))
println(tables)
Which gives you:
RangeM(Main$$anon$1$Table#5492bbba)
To do what you want, add a toList to the end:
val tables = (1 to numTables).map(new Table(_)).toList
val tables = (1 to numTables).map(new Table(_))
This line seems to be causing all the trouble - mapping over 1 to n gives you a RandomAccessSeq.Projection, and to be honest, I don't know how exactly they work, but a bit less clever initialising technique does the job.
var tables: Array[Table] = new Array(numTables)
for (i <- 0 to numTables) tables(i) = new Table(i)
Using the first initialisation method I wasn't able to change the objects (just like you), but using a simple array everything seems to be working.