110 lines
2.2 KiB
Racket
110 lines
2.2 KiB
Racket
#lang scribble/manual
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@(require (for-label racket))
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@title{Float}
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Floating point number@section{categories}
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Math
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@section{description}
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A 64-bit double precision floating point number. Float inherits most of its behaviour from its superclass.
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Note that despite its name, link::Classes/FloatArray:: only holds 32-bit (single precision) floats.
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For a raw array of 64-bit floats, use link::Classes/DoubleArray::.
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@section{ClassMethods}
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@section{method}
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from32Bits
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@section{returns}
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a new Float from a 32 bit word.
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@section{method}
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from64Bits
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@section{returns}
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a new Float from a 64 bit word.
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@section{InstanceMethods}
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@section{method}
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do
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iterates a link::Classes/Function:: from
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@racketblock[0:: to ]
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@racketblock[this-1::. See also: link::Classes/Integer#-do::, link::Classes/Collection#-do::
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]
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@section{argument}
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function
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The function to iterate.
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@section{method}
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reverseDo
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iterates function from this-1 to 0
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@section{argument}
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function
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The function to iterate.
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@section{method}
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coin
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Perform a random test whose probability of success in a range from
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zero to one is this and return the result.
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@section{returns}
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a link::Classes/Boolean::
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@section{discussion}
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@racketblock[
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0.2.coin; // 20 % chance for true.
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::
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See also: link::Guides/Randomness::
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]
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@section{method}
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isFloat
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@section{returns}
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@racketblock[true:: since this is a Float.
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]
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@section{method}
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asFloat
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@section{returns}
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@racketblock[this:: since this is a Float.
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]
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@section{method}
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as32Bits
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@section{returns}
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an Integer which is the bit pattern of this as a 32bit single precision float
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@section{method}
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high32Bits
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@section{returns}
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an Integer which is the bit pattern of high 32 bits of the 64 bit double precision floating point value
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@section{method}
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low32Bits
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@section{returns}
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an Integer which is the bit pattern of high 32 bits of the 64 bit double precision floating point value
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@section{method}
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asStringPrec
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Returns a string representation of the number, with the desired precision (i.e. number of significant figures).
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@section{discussion}
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@racketblock[
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// example:
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pi
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pi.asStringPrec(3)
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pi.asStringPrec(6)
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(pi * 0.0001).asStringPrec(3)
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7.4.asStringPrec(5)
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7.4.asStringPrec(50)
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::
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]
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