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doc addition and prose tweaks

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svn: r18376
This commit is contained in:
Matthew Flatt 2010-02-27 03:40:15 +00:00
parent 831dcc0c2c
commit 2caaf05ca6
3 changed files with 15 additions and 9 deletions
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8
collects/scribblings/guide/scripts.scrbl
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@ -5,9 +5,9 @@
@title[#:tag "scripts"]{Scripts} @title[#:tag "scripts"]{Scripts}
Scheme files can be turned into executable scripts on Unix and Mac OS Scheme files can be turned into executable scripts under Unix and Mac
X. On Windows, one option is to use a compatibility layer like Cygwin, OS X. Under Windows, a compatibility layer like Cygwin support the
or write scripts as batch files. same kind of scripts, or scripts can be implemented as batch files.
@section{Unix Scripts} @section{Unix Scripts}
@ -119,7 +119,7 @@ the script file turns out to be valid input to both @exec{/bin/sh} and
@section{Windows Batch Files} @section{Windows Batch Files}
A similar trick can be used to write Scheme code in Windows A similar trick can be used to write Scheme code in Windows
@as-index{@tt{batch}} files: @as-index{@tt{.bat}} batch files:
@verbatim[#:indent 2]|{ @verbatim[#:indent 2]|{
; @echo off ; @echo off

10
collects/scribblings/reference/numbers.scrbl
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@ -589,9 +589,9 @@ produces @scheme[+nan.0] in the case that neither @scheme[y] nor
Returns @scheme[#t] when the @scheme[m]th bit of @scheme[n] is set in @scheme[n]'s Returns @scheme[#t] when the @scheme[m]th bit of @scheme[n] is set in @scheme[n]'s
(semi-infinite) two's complement representation. (semi-infinite) two's complement representation.
This is equivalent to This operation is equivalent to
@scheme[(not (zero? (bitwise-and n (arithmetic-shift 1 m))))], @scheme[(not (zero? (bitwise-and n (arithmetic-shift 1 m))))],
but is faster and runs in constant time when @scheme[n] is positive. but it is faster and runs in constant time when @scheme[n] is positive.
@mz-examples[(bitwise-bit-set? 5 0) (bitwise-bit-set? 5 2) (bitwise-bit-set? -5 (expt 2 700))]} @mz-examples[(bitwise-bit-set? 5 0) (bitwise-bit-set? 5 2) (bitwise-bit-set? -5 (expt 2 700))]}
@ -605,7 +605,7 @@ but is faster and runs in constant time when @scheme[n] is positive.
Extracts the bits between position @scheme[start] and @scheme[(- end 1)] (inclusive) Extracts the bits between position @scheme[start] and @scheme[(- end 1)] (inclusive)
from @scheme[n] and shifts them down to the least significant portion of the number. from @scheme[n] and shifts them down to the least significant portion of the number.
This is equivalent to this computation, This operation is equivalent to the computation
@schemeblock[ @schemeblock[
(bitwise-and (sub1 (arithmetic-shift 1 (- end start))) (bitwise-and (sub1 (arithmetic-shift 1 (- end start)))
@ -616,8 +616,8 @@ but it runs in constant time when @scheme[n] is positive, @scheme[start] and
@scheme[end] are fixnums, and @scheme[(- end start)] is no more than @scheme[end] are fixnums, and @scheme[(- end start)] is no more than
the maximum width of a fixnum. the maximum width of a fixnum.
Each pair of examples below uses the same numbers, but shows the result in Each pair of examples below uses the same numbers, showing the result
both binary and as integers. both in binary and as integers.
@mz-examples[(format "~b" (bitwise-bit-field (string->number "1101" 2) 1 1)) @mz-examples[(format "~b" (bitwise-bit-field (string->number "1101" 2) 1 1))
(bitwise-bit-field 13 1 1) (bitwise-bit-field 13 1 1)

6
collects/scribblings/reference/sets.scrbl
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@ -48,6 +48,12 @@ that they appear as @scheme[v]s, so in the first two cases, an earlier
element that is @scheme[equal?] or @scheme[eqv?] but not @scheme[eq?] element that is @scheme[equal?] or @scheme[eqv?] but not @scheme[eq?]
to a later element takes precedence over the later element.} to a later element takes precedence over the later element.}
@defproc[(set-empty? [set set?]) boolean?]{
Returns @scheme[#t] if @scheme[set] has no members, @scheme[@f]
otherwise.}
@defproc[(set-member? [set set?] [v any/c]) boolean?]{ @defproc[(set-member? [set set?] [v any/c]) boolean?]{
Returns @scheme[#t] if @scheme[v] is in @scheme[set], @scheme[#f] Returns @scheme[#t] if @scheme[v] is in @scheme[set], @scheme[#f]