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10.17GeneratingRandomNumbersinQuestions
Thealgorithmsyntaxinthesystemallowsyoutogeneraterandomnumbersinavarietyofways,dependingonyour
requirementsandpreferences.Thistablesummarizesfunctionsrelatedtorandomnumbergeneration.
Table10.9:RandomNumberGenerators
Description
Example
RangeofOperation
Function
Returnsarandomintegerbetween
0andn-1(inclusive).Generatesn
variations.
rint(3)
=0,1,or2
0,...,n-1
rint(n)
Returnsarandomintegerbetween
mandn-1(inclusive).Generates
n-mvariations.
rint(3,6)
=3,4,or5
m,...,n-1
rint(m,n)
Returnsarandomintegerbetween
mandn-1(inclusive)instepsofk.
rint(3,12,3)
=3,6,or9
m,m+k,m+2k,...,m+q*k
(whereqisthelargestinteger
suchthat
)
rint(m,n,k)
Generatesapproximately(n-m)/k
variations.
Returnsarandomintegerbetween
1andn(inclusive).Generatesn
variations.
range(3)
=1,2,or3
1,...,n
range(n)
Returnsarandomintegerbetween
mandn(inclusive).Generates(n-
m)+1variations.
range(3,6)
=3,4,5,or6
m,...,n
range(m,n)
Returnsarandomintegerbetween
mandn(inclusive),instepsofk.
range(3,12,3)
=3,6,9,or12
m,m+k,m+2k,...,m+q*k
(whereqisthelargestinteger
suchthat
)
range(m,n,k)
Generatesapproximately(n-m)/k
+1
variations.
Returnsarandomrealnumber
betweenmandn(inclusive).
rand(0.5,9.5)
=allrealnumbersbetween0.5
and9.5(inclusive)
m,...,n
rand(m,n)
Returnsarandomrealnumber
betweenmandn(inclusive),ex-
pressedtoksigniﬁcantﬁgures
rand(0.5,9.5,3)
=allrealnumbersbetween0.5
and9.5(inclusive),expressed
to3signiﬁcantﬁgures
m,...,nexpressedtoksigniﬁc-
antﬁgures
rand(m,n,k)
Fordetailsoneachofthesefunctions,seeFunctionsandArguments(page242).
TM
commands.Mapleprovidesmanyrandomization
commands.ThefollowingtablelistsselectedrandomizationcommandsinMaple.FormoreinformationonMaple
functionsthatcanbeusedtogeneraterandomnumbers,refertoyourMapledocumentation.
Table10.10:MapleRandomizationCommands
Use
MapleFunction
generatearandom12-digitnon-negativeinteger,orarandomintegerwithinaspe-
ciﬁedrange(inclusive)
rand
randompolynomialgenerator
randpoly
constructarandomMatrix
LinearAlgebra[RandomMatrix]
10.17GeneratingRandomNumbersinQuestions • • 241
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Use
MapleFunction
constructarandomVector
LinearAlgebra[RandomVector]
generateaparticularrandomobject(Forexample,returnarandomcomplexnumber
withrealandimaginarypartsofaspeciﬁedﬂavor,orchooseoneoftheentriesin
acollectionwithequalprobability)
RandomTools[Generate]
Note:WhenusingMaple'srandomnumbergeneratorrand,youmustincluderandomize():astheﬁrstpartofthecall.
defaultseedinMaple.Withoutrandomize(),eachcalltorandwillproducethesamesequenceofvaluesusingthe
defaultrandomizationseed.ForanexamplethatusesMaplerandomizationcommands,seeTutorial:Maple-based
AlgorithmicQuestionAuthoring(page263).
SeeAlso:
Tutorial:AlgorithmicQuestion(page260)
Tutorial:List-basedVariables(page261)
Tutorial:Maple-basedAlgorithmicQuestionAuthoring(page263)
10.18FunctionsandArguments
Thesystemcontainsnumerousbuilt-infunctionsforcreatingalgorithmicvariables.Youcancreaterandomintegers
orrealnumbers,performoperationsonlistsofitems,orsetconditionsonvariables.
Thissectiondescribesthebuilt-infunctions,andgivesthesyntaxandpurposeofeachfunction.
Mostofthesefunctionsareforuseinauthoringquestions,butcannotbeusedinstudentresponses.Formoreinformation,
condition:x
condition:x
Imposestheconditiondeﬁnedbystatementx,whichistypicallyconstructedusingoneormoreotherfunctions.
Forexample,
$a=range(-10,10); condition: ne($a,0);
Thisgeneratesarandomnon-zerointegerbetween-10and10(inclusive).
decimal(n,x),sig(n,x),int(x)
decimal(n, x)
Returnsxexpressedasaﬂoating-pointnumberroundedtondecimalplaces.Whendecimal(0,expression)isused
withanexpression,thesystemautomaticallyinsertscommastoseparatethousands.
Trailingzerosaretruncatedandnotdisplayed.Foranotheroption,seenumfmt(fmt,x)(page247).
sig(n, x)
Returnsxexpressedasaﬂoating-pointnumberroundedtonsigniﬁcantdigits.Incasesofpossibleambiguity,scientiﬁc
notationisusedtodisplaythevalue.
int(x)
Returnstheintegerpartofx.
242 • 10AuthoringMathematicalQuestions
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Forexample,
decimal(3, 20.8571)
returns20.857
sig(3, 20.8571)
returns 20.9
int(20.8571)
returns
20
eq(a,b),ge(a,b),le(a,b),ne(a,b)
eq(a, b)
Returns1.0ifaandbareequal.Otherwise,itreturns0.0.
ge(a,b)
Returns1.0ifaisgreaterthan,orequaltob.Otherwise,itreturns0.
le(a,b)
Returns1.0ifaislessthan,orequaltob.Otherwise,itreturns0.0.
ne(a,b)
Returns1.0ifaandbarenotequal.Otherwise,itreturns0.0.
Forexample,
if(eq($a,$b), "Red", , "Green")
returnsRedif$a=$bandGreenotherwise.
if(ge($a,$b), "Red", , "Green")
returns Redif$a>=$bandGreenotherwise.
if(le($a,$b), "Red", , "Green")
returnsRedif$a<=$bandGreenotherwise.
if(ne($a,$b), "Red", , "Green")
returnsRedif$aand$barenotequalandGreenotherwise.
SeeAlso:
if(a,b,c)(page244)
fact(n)
fact(n)
Returnsfactorialn.
Ifnisnotanintegerreturnsfact(int(n)).
Ifnisnegative,returns1.
10.18FunctionsandArguments • • 243
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Forexample,
fact(4)
returns24
frac(a,b)
frac(a, b)
Thefrac(a,b)structuretypesetsx/yasafractioninitslowestterms.Forexample,thefractions"4/8"and
"2/6"arepresentedas"1/2"and"1/3",insimplestform.
frac(a,b)returnsastringthatexpressesthefractiona/binitslowestterms.
Forexample,
frac(12, 15)
returns4/5
frac(12, 3)
returns4
Note:frac(a,b)canbecombinedwithmathml(s)toproducenicelytypesetfractions.Forexample,
mathml(frac(8, 12))
displays
gcd(a,b)
gcd(a, b)
Returnsthegreatestcommondivisorofaandb.
Forexample,
gcd(12, 15)
returns3
gt(a,b),lt(a,b)
gt(a, b)
Returns1.0ifisgreaterthan b, that is (a > b).Otherwise,itreturns0.0.
lt(a, b)
Returns1.0ifislessthan b, that is (a < b).Otherwise,itreturns0.0.
if(a,b,c)
if(a, b, , c)
Ifaisnonzero,itreturnsb.Otherwise,itreturnsc.
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indexof(k,a,b,c,d,...)
Returnstheindexofanitemwithinalist(theﬁrstitemisinposition0,thesecondinposition1,andsoon).
Forexample,
indexof(3, 2, 3, 5, 7, 11)
returns1
java(cn,a,b,c,d,...)
java(cn, a, b, c, d, ...)
Passtheargumentsa,b,c,d,..toacustomJava
TM
evaluationengineandreturntheresult.Theﬁrstargument
(cn)mustbeastringgivingthefullyqualiﬁednameofaJavaclassthatimplementstheinterface
gateway.question.random.AlgorithmicFunction.
Thisinterfacehasasinglepublicmethod.
public String eval(String[ ] args);
Theargumentsa,b,c,d,...arepassedtoeval()inastringarray.
Forexample,
java("com.mycompany.QuoteFunction", "SUNW")
programmed).
lsu(n,x)
lsu(n, x)
Returnstheunitinthenthsigniﬁcantplaceofx.(Thisiscalledtheleastsigniﬁcantunitofxinthenthplace).
Forexample,
lsu(3, 3.14159)
returns0.01(theunitinthethirdsigniﬁcantplace).
towithinatoleranceofoneunitinthethirdsigniﬁcantdigit,use:
$ans = <formula>;$tol = lsu(3, $ans); andsettheanswerﬁeldto:$ans ? ? $tol maple(text) PasstexttotheMaple TM kernelandreturnthevalueofthelastlineprocessed. 10.18FunctionsandArguments • • 245 VB.NET PDF - WPF PDF Viewer for VB.NET Program to Png, Gif, Bitmap Images. File & Page Process. File: Merge, Append PDF Files. File: Split PDF Document. File: Compress PDF. Page adding pdf pages together; acrobat reader merge pdf files VB.NET Create PDF from PowerPoint Library to convert pptx, ppt to to Png, Gif, Bitmap Images. File & Page Process. File: Merge, Append PDF Files. File: Split PDF Document. File: Compress PDF. Page add pdf files together reader; .net merge pdf files Forexample, maple("ithprime(12)") returns37 maple("diff(sin(x)*x, x)") returnscos(x)*x + sin(x) SeeAlso: MathematicalandLogicalOperatorsinAlgorithmsandAnswers(page252) mathml(f) ReturnsastringconsistingoftheformulaftypesetinMathML. Note:ThesystemrendersMathML;theMathMLtagsdonotappearonthescreenwhenthevalueofthestringisdis- played.Instead,therenderingappears. Forexample, mathml("x^$n")
returns
Bydefault,mathml(f)automaticallysimpliﬁestheformula.Topreventauto-simpliﬁcation,usethe"nosimplify"
option.
Forexample,
mathml("x^2 + 4/8", , "nosimplify")
returns
Ifyouwanttoincludethefunctioninanotherfunction,usethe"notags"option.
$\sum0^\infty\var{mathml("1/$a x^2
+ $b)", "notags")}$
SeeAlso:
InlineDisplayofFormattedMathExpressions(page216)
SimpliﬁedMathExpressions(page219)
max(a,b,c,d,...),min(a,b,c,d,...)
max(a, b, c, d, ...)
Returnsthelargestofthearguments.
Forexample,
max(3,5,7,4.8,-1)
returns
246 • 10AuthoringMathematicalQuestions
7
min(a, b, c, d, , ...)
Returnsthesmallestofthearguments.
Forexample,
min(3, 5, 7, 4.8, -1)
returns
-1
not(a)
not(a)
Returns1.0ifaisequalto0.0.Otherwise,itreturns1.0.
numfmt(fmt,x)
Returnsthevalueofx,formattedaccordingtothetemplatefmt.
Forexample,
numfmt("#.00", 20.9)
returns20.90.
plotmaple(text)
MapleT.A.usesMaple
TM
plottingfeaturestodisplayplots.Mapleprovidesmanywaysofrepresentingdataand
mathematicalexpressionsgraphicallyusingplots.Youcandisplayaplotwithanyquestiontype.
Theplotmaplecommandcanbeusedanywhereanalgorithmicvariablecanbeused,thatis,intext,hints,feedback,
andmore.
plotmaple("plotstatement, libname='filename.lib', , plotdevice='gif|jpeg',
plotoptions='options'");
Where
• plotstatement - plotexpressionandplotoptions
• libname(optional)-speciﬁespathtouserMaplelibraries
• plotdevice(optional)-gif(producesaGIF/ANIMATED-GIF)orjpeg(producesa24-bitcolorJPEGren-
deringoftheimage)
• plotoptions(optional)-speciﬁesplotoptionsavailablefortheplotdevicespeciﬁed(seeTable10.11)
Someexamples:
plotmaple("plot3d(sin(x)*y, x=0..10, y=-1..1, style=patchnogrid, , lightmodel=light1),
plotdevice='jpeg', plotoptions='width=250,height=250'")
plotmaple("plot(sin(x), x=-Pi..Pi), plotdevice='gif', , plotoptions='height=250, width=250'");
10.18FunctionsandArguments • • 247
plotmaple("plot(sin(x), x=-Pi..Pi), plotdevice='jpeg', , plotoptions='height=250, , width=250'");
Table10.11:OptionsforGIFandJPEGPlots
result
GIFplotoptions
Setthenumberofcolors.Thedefault256colors.
colors=n
Setthenumberofpixelsintheheight.Thedefaultis512.
height=n
Setthenumberofpixelsinthewidth.Thedefaultis512.
width=n
result
JPEGplotoptions
Specifytheheightofthecanvas.Thedefaultis360.
height=n
SettheJPEGqualitylevel,anintegervaluefrom0to100.The
defaultis95.Settingsgreaterthan95generallyhavenegligible
visibleeffect.
quality=n
Specifythewidthofthecanvas.Thedefaultis480.
width=n
SeeAlso:
SettingPlotOptions(page255)
rand(m,n),rand(m,n,k)
rand(m,n)
Returnsarandomrealnumberbetweenmandn(inclusive).Forexample,togeneraterandomnumbersbetween0.5
and9.5,usetheformula:
rand(0.5, 9.5)
rand(m,n,k)
Returnsarandomrealnumberbetweenmandnexpressedtok(k>0)signiﬁcantdigits(kistruncatedtoaninteger).
Forexample,togeneratenumbersbetween2.73and7.91totwosigniﬁcantﬁgures,use:
rand(2.73, 7.91, 2)
Note:Inthisdeﬁnition,thedummyvariablekrepresentsthenumberofsigniﬁcantﬁgures,notthestepsize(asitindicatesinde-
ﬁningrangeandrint).