infinity

I'm trying to implement a data structure where if I had the use of infinity for numerical comparison purposes, it would simply things greatly. Note this isn't maxBound/minBound, because a value can be <= maxbound, but all values would be < infinity. No hope? Maybe you want a Maybe type? data Infinite a = Infinite | Only a then write a Num instance for Num a => Infinite a, with the numeric rules you need. Well how about that! It turns out if you just type 1/0 it returns Infinity ! On ghci: Prelude> 1/0 Infinity Prelude> :t 1/0 1/0 :: (Fractional t) => t Prelude> let inf=1/0 Prelude> filter (>

How can I display an infinity symbol (like the one in the picture) using HTML? Use the HTML entity ∞ or ∞ . Gumbo You can use the following: literal: ∞ (if the encoding you use can encode it — UTF-8 can, for example) character reference: ∞ (decimal), ∞ (hexadecimal) entity reference: ∞ But whether it is displayed correctly does also depend on the font the text is displayed with. ∞ This does not require a HTML entity if you are using a modern encoding (such as UTF-8). And if you're not already, you probably should be. From Wikipedia : ∞ artlung According to List of XML and HTML character entity

I have an int a that needs to be equal to "infinity". This means that if int b = anyValue; a>b is always true. Is there any feature of C++ that could make this possible? Integers are inherently finite. The closest you can get is by setting a to int 's maximum value: #include <limits> // ... int a = std::numeric_limits<int>::max(); Which would be 2^31 - 1 (or 2 147 483 647 ) if int is 32 bits wide on your implementation. If you really need infinity, use a floating point number type, like float or double . You can then get infinity with: double a = std::numeric_limits<double>::infinity();

Apparently, infinity and NaN are not a part of JSON specification, so this PHP code: $numbers = array(); $numbers ['positive_infinity'] = +INF; $numbers ['negative_infinity'] = -INF; $numbers ['not_a_number'] = NAN; $array_print = print_r ($numbers, true); $array_json = json_encode ($numbers); echo "\nprint_r(): $array_print"; echo "\njson_encode(): $array_json"; Produces this: PHP Warning: json_encode(): double INF does not conform to the JSON spec, encoded as 0 in /home/septi/test.php on line 8 PHP Warning: json_encode(): double -INF does not conform to the JSON spec, encoded as 0 in /home

When running this in a node command-line interface: > Math.tan(Math.PI/2) 16331778728383844 But in Chrome: > Math.tan(Math.PI/2) Infinity Aren't both using the same V8 engine? Node's result is not even equal to the maximum "integer" value in JavaScript . If you look at the v8 implementation of the Math object , you see: function MathTan(x) { return MathSin(x) / MathCos(x); } Indeed, Math.cos(Math.PI/2) returns an unusual value in Node as well (in fact, the reciprocal of your unusual Math.tan result): > Math.cos(Math.PI/2) 6.123031769111886e-17 // in Chrome, this is 0 So, your question reduces

Is there a keyword to express Infinity in Ruby? Matt If you use ruby 1.9.2, you can use : >> Float::INFINITY #=> Infinity >> 3 < Float::INFINITY #=> true Or you can create your own constant using the following*: I've checked that in Ruby 1.8.6, 1.8.7, and 1.9.2 you have Float.infinite? . PositiveInfinity = +1.0/0.0 => Infinity NegativeInfinity = -1.0/0.0 => -Infinity CompleteInfinity = NegativeInfinity..PositiveInfinity => -Infinity..Infinity *I've verified this in Ruby 1.8.6 and 1.9.2 No keyword, but 1.9.2 has a constant for this: >> Float::INFINITY #=> Infinity >> 3 < Float::INFINITY #=>

I have a series of Javascript calculations that (only under IE) show Infinity depending on user choices. How does one stop the word Infinity appearing and for example, show 0.0 instead? if (result == Number.POSITIVE_INFINITY || result == Number.NEGATIVE_INFINITY) { // ... } You could possibly use the isFinite function instead, depending on how you want to treat NaN . isFinite returns false if your number is POSITIVE_INFINITY , NEGATIVE_INFINITY or NaN . if (isFinite(result)) { // ... } A simple n === n+1 or n === n/0 works: function isInfinite(n) { return n === n/0; } Be aware that the native