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ConstructingamemmapfileObject
Filename: 'd:\matlab\records.dat'
Writable: false
Offset: 1024
Format: {'uint32' [4 10 18] 'x'}
Repeat: Inf
Data: 13x1 struct array with fields:
x
A = = m.Data(1).x;
whos A
Name
Size
Bytes
Class
Attributes
A
4x10x18
2880
uint32
Youcanchangetheclass,arrayshape,orfieldnamethatMATLABapplies
tothemappedregionatanytimebysettinganewvalueforthe
Format
propertyoftheobject:
m.Format = {'uint64' [30 4 10] ] 'x'};
A = = m.Data(1).x;
whos A
Name
Size
Bytes
Class
Attributes
A
30x4x10
9600
uint64
MappingMultipleDataTypesandArrays
Iftheregionbeingmappediscomposedofsegmentsofvaryingclassesor
arrayshapes,youcanspecifyanindividualformatforeachsegmentusingan
N-by-3cellarray,whereNisthenumberofsegments. Thecellsofeachcell
arrayrowidentifytheclassforthatsegment,thearraydimensionstomap
thedatato,andafieldnamebywhichtoreferencethatsegment:
objname = = memmapfile(filename,
...
'Format', {
...
datatype1, dimensions1, fieldname1;
...
datatype2, dimensions2, fieldname2;
...
:
:
:
...
datatypeN, dimensionsN, fieldnameN})
4-17
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4
Memory-MappingDataFiles
Thefollowingcommandmapsdataina20.75-kilobytefiletothreedifferent
classes:
int16
,
uint32
,and
single
.The
int16
dataismappedasa2-by-2
matrixthatcanbeaccessedusingthefieldname
model
.The
uint32
dataisa
scalarvalueaccessedasfield
serialno
.The
single
dataisa1-by-3matrix
named
expenses
.
Eachofthesefieldsbelongstothe800-by-1structurearray
m.Data
:
m = = memmapfile('records.dat',
...
'Offset', 2048,
...
'Format', {
...
'int16'
[2 2] 'model';
...
'uint32' [1 1 1] 'serialno';
...
'single' [1 1 3] 'expenses'});
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ConstructingamemmapfileObject
Mappingofthe Example File
Thefigurebelowshowstheorderingofthearrayelementsmoreclosely.
Inparticular,itillustratesthatMATLABarraysarestoredonthediskin
column-majororder.Thesequenceofarrayelementsinthemappedfileisrow
1,column1;row2,column1;row1,column2;androw2,column2.
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Memory-MappingDataFiles
Ifthedatainyourfileisnotstoredinthisorder,youmightneedtotranspose
orrearrangetheorderofarrayelementswhenreadingorwritingviaa
memorymap.
SupportedDataTypesfortheFormatProperty
Youcanuseanyofthefollowingclasseswhenyouspecifya
Format
value.The
defaulttypeis
uint8
.
FormatString
DataType Description
'int8'
Signed8-bitintegers
'int16'
Signed16-bitintegers
'int32'
Signed32-bitintegers
'int64'
Signed64-bitintegers
'uint8'
Unsigned8-bitintegers
'uint16'
Unsigned16-bitintegers
'uint32'
Unsigned32-bitintegers
'uint64'
Unsigned64-bitintegers
'single'
32-bitfloating-point
'double'
64-bitfloating-point
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ConstructingamemmapfileObject
RepeatingaFormatScheme
Afteryouseta
Format
valueforthe
memmapfile
object,youcanhave
MATLABapplythatformattothefiledatamultipletimesbyspecifyinga
Repeat
valuewhenyoucallthe
memmapfile
constructor:
objname = = memmapfile(filename,
...
'Format', formatspec, ...
'Repeat', count)
The
Repeat
valueappliestothewholeformatspecifier,whetherthatspecifier
describesjustasingleclassthatrepeats,oramorecomplexformatthat
includesvariousclassesandarrayshapes. Thedefault
Repeat
valueis
infinity(
inf
),whichmeansthatthefullextentofthe
Format
specifierrepeats
asmanytimesaspossiblewithinthemappedregion.
Thenextexamplemapsafileregionidenticaltothatofthepreviousexample,
exceptthepatternof
int16
,
uint32
,and
single
classesisrepeatedonly
threetimeswithinthemappedregionofthefile:
m = = memmapfile('records.dat',
...
'Offset', 2048,
...
'Format', {
...
'int16'
[2 2] 'model';
...
'uint32' [1 1 1] 'serialno';
...
'single' [1 1 3] 'expenses'},
...
'Repeat', 3);
Youcanchangethevalueofthe
Repeat
propertyatanytime. Tochange
therepeatvalueto5,type
m.Repeat = 5;
Propertynames,like
Repeat
,arenotcasesensitive.
KeepingtheRepeatedFormatWithintheMappedRegion
MATLABmapsonlythefullpatternspecifiedbythe
Format
property.Ifyou
repeataformatsuchthatitwouldcausethemaptoextendbeyondtheend
ofthefile,theneitheroftwothingscanhappen:
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Memory-MappingDataFiles
• Ifyouspecifyarepeatvalueof
Inf
,MATLABappliestothemaponlythose
repeatedsegmentsthatfitwithinthefileintheirentirety.
• Ifyouspecifyarepeatvalueotherthan
Inf
,andthatvaluewouldcause
themaptoextendbeyondtheendofthefile,MATLABgeneratesanerror.
Consideringthelastexample,ifthepartofthefilefrom
m.Offset
totheend
were70bytes(insteadofthe72bytesrequiredtorepeat
m.Format
three
times)andyouuseda
Repeat
valueof
Inf
,thenonlytwofullrepetitionsof
thespecifiedformatwouldhavebeenmapped.Theendresultisasifyouhad
constructedthemapwiththiscommand:
m = = memmapfile('records.dat',
...
'Offset', 2048,
...
'Format', {
...
'int16'
[2 2] 'model';
...
'uint32' [1 1 1] 'serialno';
...
'single' [1 1 3] 'expenses'},
...
'Repeat', 2);
If
Repeat
weresetto3andyouhadonly70bytestotheendofthefile,you
wouldgetanerror.
Note
memmapfile
doesnotexpandorappendtoamappedfile.Usestandard
fileI/Ofunctionslike
fopen
and
fwrite
todothis.
SettingtheType ofAccess
Youcanmapafileregiontoalloweitherread-onlyorreadandwriteaccess
toitscontents. Passa
Writable
parameterandvalueinthe
memmapfile
constructor,orset
m.Writable
onanexistingobjecttosetthetypeofaccess
allowed:
objname = = memmapfile(filename, 'Writable', , trueorfalse)
Thevaluepassedcanbeeither
true
(equalto
logical(1)
)or
false
(equal
to
logical(0)
). Bydefault,itis
false
,meaningthatthemappedregion
isreadonly.
Tomapareadandwriteregionofthefile
records.dat
inmemory,type
4-22
ConstructingamemmapfileObject
m = = memmapfile('records.dat', 'Writable', true);
NoteTosuccessfullymodifythefileyouaremappingto,youmusthavewrite
permissionforthatfile.Ifyoudonothavewritepermission,youcanstillset
the
Writable
propertyto
true
,butattemptingtowritetothefilegenerates
anerror.
Youcanchangethevalueofthe
Writable
propertyatanytime.Tomakethe
memorymapto
records.dat
readonly,type:
m.Writable = false;
Propertynames,like
Writable
,arenotcasesensitive.
4-23
4
Memory-MappingDataFiles
ReadingaMappedFile
Inthis section...
“Introduction”onpage4-24
“ImprovingPerformance”onpage4-24
“Example1—ReadingaSingleDataType”onpage4-25
“Example2—FormattingFileDataasaMatrix”onpage4-26
“Example3—ReadingMultipleDataTypes”onpage4-27
“Example4—ModifyingMapParameters”onpage4-28
Introduction
Themostcommonlyusedpropertyofthe
memmapfile
classisthe
Data
property.Itisthroughthispropertyofthememory-mapobjectthatMATLAB
providesallreadandwriteaccesstothecontentsofthemappedfile.
TheactualmappingofafiletotheMATLABaddressspacedoesnottake
placewhenyouconstructa
memmapfile
object.Amemorymap,basedonthe
informationcurrentlystoredinthemappedobject,isgeneratedthefirsttime
youreferenceormodifythe
Data
propertyforthatobject.
Afteryoumapafiletomemory,youcanreadthecontentsofthatfileusing
thesameMATLABstatementsusedtoreadvariablesfromtheMATLAB
workspace. Byaccessingthe
Data
propertyofthememorymapobject,the
contentsofthemappedfileappearasiftheywereanarrayinthecurrently
activeworkspace.Yousimplyindexintothisarraytoreadthedesireddata
fromthefile.
ImprovingPerformance
MATLABaccessesdatainstructuresmoreefficientlythanitdoesdata
containedinobjects.Themainreasonisthatstructuresdonotrequirethe
extraoverheadofa
subsref
routine. Insteadofreadingdirectlyfromthe
memmapfile
object,asshownhere:
for k = 1 1 : : N
y(k) = = m.Data(k);
4-24
Reading aMappedFile
end
youwillgetbetterperformancewhenyouassignthe
Data
fieldtoavariable,
andthenreadthemappedfilethroughthisvariable,asshowninthissecond
example:
dataRef = = m.Data;
for k = 1 1 : : N
y(k) = = dataRef(k);
end
Example1—ReadingaSingleDataType
Thisexamplemapsafileof100double-precisionfloating-pointnumbersto
memory.Themapbegins1024bytesfromthestartofthefile,andends800
bytes(8bytesper
double
timesa
Repeat
valueof100)fromthatpoint.
Ifyouhaven’tdonesoalready,generateatestdatafileforuseinthefollowing
examplesbyexecutingthe
gendatafile
functiondefinedunder“Constructing
amemmapfileObject”onpage4-10:
gendatafile('records.dat', 5000);
Now,constructthe
memmapfile
object
m
,andshowtheformatofits
Data
property:
m = = memmapfile('records.dat', 'Format', 'double', ...
'Offset', 1024, 'Repeat', 100);
d = = m.Data;
whos d
Name
Size
Bytes
Class
Attributes
d
100x1
800
double
Readaselectedsetof numbersfromthefilebyindexingintothe
single-precisionarray
m.Data
:
d(15:20)
ans =
1.0e+009 *
4-25
4
Memory-MappingDataFiles
3.6045
2.7006
0.5745
0.8896
2.6079
2.7053
Example2—FormattingFileDataasaMatrix
Thisexampleissimilartothelast,exceptthattheconstructorofthe
memmapfile
objectnowspecifiesanarrayshapeof4-by-6tobeappliedtothe
dataasitisreadfromthemappedfile.MATLABmapsthefilecontentsintoa
structurearrayratherthananumericarray,asinthepreviousexample:
m = = memmapfile('records.dat',
...
'Format', {'double', [4 6], 'x'},
...
'Offset', 1024, 'Repeat', 100);
d = = m.Data;
whos d
Name
Size
Bytes
Class
Attributes
d
100x1
25264
struct
Whenyoureadanelementofthestructurearray,MATLABpresentsthe
dataintheformofa4-by-6array:
d(5).x
ans =
1.0e+009 *
3.1564
0.6684
2.1056
1.9357
1.2773
4.2219
2.9520
0.8208
3.5044
1.7705
0.2112
2.3737
1.4865
1.8144
1.9790
3.8724
2.9772
1.7183
0.7131
3.6764
1.9643
0.0240
2.7922
0.8538
Toindexintothestructurearrayfield,use:
d(5).x(3,2:6)
ans =
1.0e+009 *
1.8144
1.9790
3.8724
2.9772
1.7183
4-26
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