Download - Vensim2 Basic Tools Text
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youstartusingthesoftwareforcreatingcausalloop
diagramsandatthesametimeexploremoreofitsfeatures.
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liketheoneonthisslide.Thetitlebarcontainsthenameof
themodelandthesocalledbenchmarkvariable.Thisisthe
variableselected
at
aparticular
time.
Since
no
model
is
selectedthetitlebarshowsVensim:NoModelOpen(forthe
nameofthemodel)Var:FINALTIME(avariableforfinitetime
ofsimulationwhichisalwayspresent).Themenuandthemain
toolbarareimmediatelybelowthetitlebar.Thetypicalicons
onthemaintoolbarareduplicatesofthewellknown
, ,
Save,Print,
Cut,
Copy,
Paste).
The
tools
in
the
middle
of
this
toolbarareusedforsimulationandthoseontheleftsidefor
analysisoftheresults.Thestatusbaratthebottomofthe
windowisusedforchan in fonts colours insertin certain
labels,etc.
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askedtodefinethesettings.Themostimportantsettings
whichthesoftwareneedsinordertorunthesimulationare
thesettings
of
time.
This
settings
will
be
explained
later.
However,ifyouarenotdefiningyourownsettingsyouwill
havetoacceptthedefaultinordertoproceedwith
modelling.ClickOKtoacceptthesettings.
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Once ouacce tthesettin s ouwillobtainthesketchtoolbarbeneaththemaintoolbar.Themaintoolsyouwillusetocreateyourmodelsareonthesketchtoolbar.Atthispointthefirst6willbeexplained.1.Locksketch(whenselected,nochangescanbemadeinthemodel).
Clickon
it
ifyou
want
to
lock
the
model.
2.Move/SizeWordsandArrows(offerspossibilitytoresizeorchangepar so em o e . ew ca s oo e an oo . c on , enselectanyelementofthemodelanddragitifyouwanttomoveit.Toresizeabox,clickanddragonthesmallcircleintherightbottomcorner.Notethatboxeswithvariables/constantsarewithoutlinesanditisnotobviousthatthesmallcircleisassociatedwiththevariable/constant.Neitherthesizeoftheletters northenameofthevariable constantchangeswiththistool.Youcanuseittochangetheshapeoftherate
(flow).If
you
click
on
the
valve
and
drag
you
can
change
the
shape
in
the
wayyouwant.Thesizeandtheshapesofthearrowscanbechangedifyouclickonthesmallcircleinthemiddleofthelinewiththearrow.Ifyouclickonthearrowexactly,youcanchangethedirectionoftheline.
Continuesonnextpage.
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3. VariableAuxiliary/constant(createsvariablesorconstants).Clickonittocreateaconstantoravariable(auxiliaryinVensim terminology).Then,clickontheworkingareaandyouwillgetaboxwhereyouwritethename.Whenyouarefinished,clickEntertoacceptthevariableorEscotherwise.Youcanchangethenameofthevariableby
clicking
on
it.
The
box
will
be
opened
and
the
name
edited.
4. Stockvariable(createsstocksorlevels).Clickonittocreatestocksan wor nt esamewayas orvar a es. ores zeormovet evariablesandthestocksusethehandtool(describedunder2).
5. Arrowtoolcreatesarrows.Clickonthevariablewhichisatthebottomofthearrowanddragtothevariablethatisatthearrow.Clickonceontheway andthenonceagainonthevariablethatisattheendofthearrowtoobtainacurvedarrow.Ifyoudontclickon
, .arrowbyselectingthehandtool.Pullthearrowatthesmallcirclein
the
middle.
If
you
want
to
change
the
colour,
the
thickness
or
someotherpropertyofthearrowrightclickonthesmallcircleinthemiddleofthearroworatthetopofthearrow. Anewwindowappearwhereyoucanchosevariousoptions.
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adddelay,changethethicknessandthestyleoftheline,
choosepolarityorothersignsandpositiontheminvarious
ways.
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6. Flowvariablecreatesflows.Clickonitfirst.Foraninflowclickontheworkingareaanddragtothestockvariable.Clickonthestockvariable.Youwillgetaboxwhereyouwritethenameoftheflow.WritethenameandpressEnter.
Ifthe
flow
is
without
aname
press
Esc.
For
an
outflow
you
startfromthestockvariableanddrageitherintoanotherstockvariableandclickthere.Ifyouclickontheworkingsurfaceyouwillgetthesink(presentedassmallcloud).Tocreateoutflowandinflowwithasinglelinewithtwoarrows,createasinglearrowfirst.Then,selectthehandtoolandrightclickonthesmallcircleoftheflowwhichisclosetotheplacewhereyouwantanewarrow.Awindowwillappear
whereyou
can
select
Arrowhead
and
get
the
arrow.
If
you
wantyourflowto goaround,oneachturnholdtheShiftkeyandclick.Thencontinuetodrag.ClickwithoutholdingtheShiftkeywhenyouwanttoendwiththeflow.
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windowshownontheslideappears.Thecommentiswritten
inthefieldCommentanditisshapedbychosingthe
shape,text
position,
font
and
colours.
Images
can
be
also
inserted.Therearealimitednumberifimagesthatarebuilt
in,butotherimagescanalsobeimported.
Youcanusedocumentingtooltoinsertatitleforyourmodel
oranyothercomment.Ifyouhavenotplannedspaceforit,
itisalwayspossibletoselectthedrawingandmoveitdown
.
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wishtochangeitseveralbuttonsareavailabletoselectthe
font,thesizeandappearenceoftheletters,thecolourofthe
letters,the
surrounding
shape,
the
text
position,
the
colour
ofthearrow,itswidthandpolarity.Thelastbuttonisfor
pushingthehighlitedwordsinthebackground.
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convenienttosplititinseveralparts.Thiscanbedoneby
usingseveralviewsforthesketch.TheViewbuttononthe
statusbar
helps
create
new
views
which
are
labelled
as
View
2,View3etc.Oncetheyarecreatedyoucanscrollthrough
differentviesbyclickingontheleftortherightarrow
positionedatbothendsoftheviewbutton.
Forexample,withsimplemodelsyoucangiveexplanation
aboutthemodelinView1,havethesketchinView2and
.