Questions tagged [coerce]
73 questions
5
votes
2 answers
Is there a standard Haskell function with type: (Floating a, RealFrac b) => a -> b?
I need to call floor() on a value, which is only constrained to be of class Floating, but floor() requires RealFrac.
How can I do this?
I'm perfectly willing to call abs() before calling floor(), but this alone seems insufficient to solve my…
dbanas
- 1,707
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- 24
5
votes
1 answer
How to use Types::Path::Tiny with Moo
My first question on this site, I come quickly. I'm a developer, I mainly use Python and Perl. I am passionate and I really like the development.
My first question is about Perl, Moo, and Type::Tiny. Type::Tiny is a great module for use with Moo of…
Hobbestigrou
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4
votes
1 answer
Problem coercing a record with complex type parameters
I have this record:
import Data.Functor.Identity
import Control.Monad.Trans.Identity
import Data.Coerce
data Env m = Env {
logger :: String -> m ()
}
env :: Env IO
env = undefined
and this coercion function
decorate
:: Coercible…
danidiaz
- 26,936
- 4
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- 95
3
votes
4 answers
Unexpected behavior of coerce inside foldMap's callback
This code compiles:
import Data.List (isPrefixOf)
import Data.Monoid (Any(..))
import Data.Coerce
isRoot :: String -> Bool
isRoot path = getAny $ foldMap (coerce . isPrefixOf) ["src", "lib"] $ path
I'm using coerce as a shortcut for wrapping the…
danidiaz
- 26,936
- 4
- 45
- 95
3
votes
2 answers
Converting dgCMatrix to logical matrix
Consider this simple sparse matrix
> (X <- sparseMatrix(c(1, 2, 1), c(1, 1, 2), x = 0:2))
2 x 2 sparse Matrix of class "dgCMatrix"
[1,] 0 2
[2,] 1 .
How can I convert it into a matrix indicating if the corresponding element is non-empty? Here is…
nalzok
- 14,965
- 21
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- 139
3
votes
2 answers
Error in OpenNLP package - dataframe coercing
I am trying to run a basic sentence annotation function and I keep running into the same error.
The code I tried to use is:
s <- as.String(cleandata) #cleandata is my data.It is a character class.
sent_ann <- Maxent_Sent_Token_Annotator()
a2 <-…
thushara tom
- 71
- 6
3
votes
2 answers
Why doesn't `Range#cover?` raise an exception when comparison fails?
Given that Time objects cannot be compared with Fixnum without explicit casting:
0 <= Time.now # => ArgumentError: comparison of Fixnum with Time failed
Time.now <= 10000000000 # => ArgumentError: comparison of Time with 10000000000 failed
and what…
sawa
- 165,429
- 45
- 277
- 381
3
votes
1 answer
Unexpected Numpy / Py3k coercion rules
I was looking for a bug in a program, and I discovered that it was produced by an unexpected behavior from Numpy...
When doing, e.g., a simple arithmetic operation on different integer types using Python3k and Numpy, like
(numpy.uint64) + (int)
the…
Koren
- 51
- 3
2
votes
2 answers
Coercing from Arrays
Suppose I have this simple class:
class Color
attr_accessor :rgb
def initialize(ary)
@rgb = ary
end
def +(other)
other = Color.new(other) unless Color === other
Color.new(@rgb.zip(other.rgb).map {|p| [p.reduce(:+), 255].min })
…
Guilherme Bernal
- 8,183
- 25
- 43
2
votes
2 answers
Can not deduce proper type when coercing newtype
I was trying to simplify my life with newtype with coerce, but I've encountered a quite painful problem when using it in certain scenario:
import Data.Coerce (coerce)
import Data.Foldable (toList)
-- | newtype instance wrapping foldable type (not…
majkrzak
- 1,332
- 3
- 14
- 30
2
votes
1 answer
How to set up an AoArrayrefs attribute with coercion from scalar into arrayref?
I would like to set up an attribute that is an array of arrayrefs with coercion of nonarrayrefs to array refs. eg.
[ 0, [ 0, 0, 0 ], [1,2,3] ] into [ [0], [ 0, 0, 0 ], [1,2,3] ]
also, I'd like to be able to push or set elements to the AoA with…
Demian
- 215
- 2
- 9
1
vote
1 answer
Lisp Coerce and Set function explanation
I try to do this directly to the interpret:
(setf example (coerce "blablabla" 'list))
and works fine. Infact (car example) returns #\b
but if I try this:
(defun myfun (string) ( (setf example (coerce string 'list))))
(myfun "blablabla")
I don't…
marchetto91
- 135
- 9
1
vote
1 answer
cassandra-cli: unable to coerce 'allias' to version 1 UUID
I'm triyng to create a column family with TimeUUIDType as name of row:
create column family users
with column_type = 'Standard'
and comparator = 'TimeUUIDType'
and default_validation_class = 'UTF8Type'
and key_validation_class = 'UTF8Type'
and…
Undrooleek
- 223
- 4
- 12
1
vote
0 answers
Error in as.data.frame.default(x[[i]], optional = TRUE): cannot coerce class ‘"function"’ to a data.frame
I am trying to make a c chart to analyse new diagnoses but I can't get past this stage. Please see code below:
Error in as.data.frame.default(x[[i]], optional = TRUE): cannot coerce class ‘"function"’ to a data.frame
Traceback:
qic(x = col_date, y…
Elizabeth Peters
- 11
- 2
1
vote
2 answers
How to convert an AppleScript URL object to text
I have a URL object in AppleScript, and I'm trying to convert it to a text object.
set theURL to "http://apple.com/myfile" as URL
--set t to theURL as text --Fails, can't coerce to text
set a to scheme of theURL --works
set b to host of theURL…
Jesse Barnum
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