<snapdata remixID="10130388"><project name="U5L2p3 Disease Spread" app="Snap! 6, https://snap.berkeley.edu" version="1"><notes></notes><thumbnail>data:image/png;base64,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image="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA4AAAAOCAYAAAAfSC3RAAABAUlEQVQ4T5WSO07DUBBFzzx/EqGYQAkFJWsA07AE1gESbAWQYBthCTR8tgAlBZTgOIKE2G+Q/RQcx3ziV87cc0dv5gqLbyU9JLPHqNkqW2Kf8M0579HlvFRqXJC84pm1hpkzeOOjvz7rVWCQWjzqRosOijKJTOlT9rrpM7Dx46Rm8YVxtOnAzlCRv4d986owWRXBT0/xOVlympNlnAlh8oAx261Aax+FcDjAyEE7UK8ENKY7umkFjnt7biPLnGLmnKNMI+PAIi25Xvy72WKjnhwVKapu4Cd3eLLzK1xAud6T9XerAFRHiglH1xiC2p8tUz57+yC3zcg1tqOxK1XieckXvJFLRgiVQEUAAAAASUVORK5CYII=" id="11"/></item></list></costumes><sounds><list struct="atomic" id="12"></list></sounds><blocks></blocks><variables></variables><scripts><script x="18" y="46"><block s="receiveGo"></block><custom-block s="initialize"></custom-block><block s="show"></block><block s="doRepeat"><block var="population size"/><script><block s="createClone"><l><option>myself</option></l></block></script></block><block s="hide"></block><custom-block s="activateTimer"></custom-block></script><script x="209" y="29"><block s="receiveOnClone"></block><custom-block s="cloneInitialize"></custom-block><block s="doForever"><script><block s="doIf"><block s="reportGreaterThan"><block var="time elapsed"/><l>0</l></block><script><block s="bounceOffEdge"></block><block s="forward"><block var="speed"/></block><block s="doIf"><block s="reportEquals"><block s="reportAttributeOf"><l><option>costume name</option></l><block s="reportGet"><l><option>self</option></l></block></block><l>healthy</l></block><script><block s="doIf"><custom-block s="collideWithSick?"></custom-block><script><block s="doSwitchToCostume"><l>sick</l></block><block s="doChangeVar"><l>infected counter</l><l>1</l></block></script></block></script></block><block s="doIf"><block s="reportEquals"><block s="reportAttributeOf"><l><option>costume name</option></l><block s="reportGet"><l><option>self</option></l></block></block><l>sick</l></block><script><block s="doWait"><l>5</l></block><block s="doSwitchToCostume"><l>healthy</l></block><block s="doChangeVar"><l>infected counter</l><l>-1</l></block><block s="bounceOffEdge"></block><block s="forward"><block s="reportProduct"><block var="speed"/><l>6</l></block></block></script></block></script></block></script></block></script><comment x="532" y="144" w="90" collapsed="false">See the hints page linked on the project page for some explanation of these blocks</comment><comment x="56" y="727" w="355" collapsed="false">5.2.3.1 What really matters is the population density but as the area where the population lives in the simulation is fixed, we can safely focus on the effects of population size.  A sensible hypothesis would be as population size (density) increases, the rate at which the disease spreads also increase (duration of outbreak decreases).</comment><comment x="60" y="838.9999999999999" w="332" collapsed="false">5.2.3.4 Some of the simplifying assumptions: &#xD;1) assume population is restricted to a fixed area, in reality population always in flux moving in/out of a locality.  (think international travelers for example)&#xD;2. assume there is no healing or immunity after infection&#xD;3. assume agents continue interacting after infection, in reality the sick will either die or be restricted in movement due to laying in hospital bed etc.).&#xD;</comment><comment x="60" y="972.9999999999999" w="328" collapsed="false">5.2.3.5 One possible hypothesis:  As POPULATION SIZE increases, the duration of outbreak (TIME ELAPSED) will decrease because the rate of infection increases.  &#xD;&#xD;5.2.3.6 A graph like an exponential decay is expected.</comment></scripts></sprite><watcher var="speed" style="normal" x="10" y="10" color="243,118,29" hidden="true"/><watcher scope="Stage" s="getTimer" style="normal" x="113" y="5.000005999999985" color="4,148,220" hidden="true"/><watcher var="time elapsed" style="normal" x="3.888888888888914" y="6.777783777777763" color="243,118,29"/></sprites></stage><hidden></hidden><headers></headers><code></code><blocks><block-definition s="label %&apos;text&apos; of size %&apos;size&apos;" type="command" category="pen"><comment x="0" y="0" w="90" collapsed="false">LABEL will stamp text on the stage at the given font size. 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%l"><block s="reportCDR"><block var="lists"/></block></custom-block><script><block s="doReport"><block s="evaluate"><block var="mapone"/><list><block s="reportListItem"><l>1</l><block var="lists"/></block></list></block></block></script><script><block s="doReport"><block s="evaluate"><block var="mapmany"/><list><block var="lists"/></list></block></block></script></block></script></block></script></block-definition><block-definition s="empty? %&apos;data&apos;" type="predicate" category="lists"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doReport"><block s="reportEquals"><block var="data"/><block s="reportNewList"><list></list></block></block></block></script></block-definition><block-definition s="keep items such that %&apos;pred&apos; from %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%predRing"></input><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doReport"><block s="reportNewList"><list></list></block></block></script></block><block s="doIfElse"><block s="evaluate"><block var="pred"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><script><block s="doReport"><block s="reportCONS"><block s="reportListItem"><l>1</l><block var="data"/></block><custom-block s="keep items such that %predRing from %l"><block var="pred"/><block s="reportCDR"><block var="data"/></block></custom-block></block></block></script><script><block s="doReport"><custom-block s="keep items such that %predRing from %l"><block var="pred"/><block s="reportCDR"><block var="data"/></block></custom-block></block></script></block></script></block></script></block-definition><block-definition s="combine with %&apos;function&apos; items of %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block s="reportCDR"><block var="data"/></block></custom-block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="data"/></block></block></script></block><block s="doReport"><block s="evaluate"><block var="function"/><list><block s="reportListItem"><l>1</l><block var="data"/></block><custom-block s="combine with %repRing items of %l"><block var="function"/><block s="reportCDR"><block var="data"/></block></custom-block></list></block></block></script></block></script></block-definition><block-definition s="if %&apos;test&apos; then %&apos;true&apos; else %&apos;false&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%b"></input><input type="%anyUE"></input><input type="%anyUE"></input></inputs><script><block s="doIfElse"><block var="test"/><script><block s="doReport"><block s="evaluate"><block var="true"/><list></list></block></block></script><script><block s="doReport"><block s="evaluate"><block var="false"/><list></list></block></block></script></block></script></block-definition><block-definition s="for %&apos;i&apos; = %&apos;start&apos; to %&apos;end&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%n">1</input><input type="%n">10</input><input type="%cs"></input></inputs><script><block s="doDeclareVariables"><list><l>step</l><l>tester</l></list></block><block s="doIfElse"><block s="reportGreaterThan"><block var="start"/><block var="end"/></block><script><block s="doSetVar"><l>step</l><l>-1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportLessThan"><block var="i"/><block var="end"/></block></autolambda><list></list></block></block></script><script><block s="doSetVar"><l>step</l><l>1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportGreaterThan"><block var="i"/><block var="end"/></block></autolambda><list></list></block></block></script></block><block s="doSetVar"><l>i</l><block var="start"/></block><block s="doUntil"><block s="evaluate"><block var="tester"/><list></list></block><script><block s="doRun"><block var="action"/><list></list></block><block s="doChangeVar"><l>i</l><block var="step"/></block></script></block></script></block-definition><block-definition s="join words %&apos;words&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%mult%txt"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block s="reportCDR"><block var="words"/></block></custom-block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="words"/></block></block></script></block><block s="doIf"><block s="reportEquals"><l></l><block s="reportListItem"><l>1</l><block var="words"/></block></block><script><block s="doReport"><custom-block s="join words %mult%txt"><block s="reportCDR"><block var="words"/></block></custom-block></block></script></block><block s="doIf"><block s="reportEquals"><l></l><block s="reportListItem"><l>2</l><block var="words"/></block></block><script><block s="doReport"><custom-block s="join words %mult%txt"><block s="reportCONS"><block s="reportListItem"><l>1</l><block var="words"/></block><block s="reportCDR"><block s="reportCDR"><block var="words"/></block></block></block></custom-block></block></script></block><block s="doReport"><block s="reportJoinWords"><list><block s="reportListItem"><l>1</l><block var="words"/></block><l> </l><custom-block s="join words %mult%txt"><block s="reportCDR"><block var="words"/></block></custom-block></list></block></block></script></block></script><scripts><script x="229.00000300000002" y="196.77778077777774"><block s="reportJoinWords"><list><l></l><l></l></list></block></script></scripts></block-definition><block-definition s="list $arrowRight sentence %&apos;data&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doReport"><custom-block s="join words %mult%txt"><block var="data"/></custom-block></block></script></block></script></block-definition><block-definition s="sentence $arrowRight list %&apos;text&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%txt"></input></inputs><script><block s="doWarp"><script><block s="doReport"><block s="reportTextSplit"><block var="text"/><l><option>whitespace</option></l></block></block></script></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%cs"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doRun"><block var="action"/><list></list></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw %&apos;cont&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">catchtag</input></inputs><script><block s="doRun"><block var="cont"/><list></list></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;value&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%anyUE"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doReport"><block s="evaluate"><block var="value"/><list></list></block></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw %&apos;tag&apos; %&apos;value&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">catchtag</input><input type="%s"></input></inputs><script><block s="doRun"><block var="tag"/><list><block var="value"/></list></block></script></block-definition><block-definition s="for each %&apos;item&apos; of %&apos;data&apos; %&apos;action&apos;" type="command" category="lists"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%l"></input><input type="%cs"></input></inputs><script><block s="doUntil"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doSetVar"><l>item</l><block s="reportListItem"><l>1</l><block var="data"/></block></block><block s="doRun"><block var="action"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><block s="doSetVar"><l>data</l><block s="reportCDR"><block var="data"/></block></block></script></block></script></block-definition><block-definition s="if %&apos;test&apos; do %&apos;action&apos; and pause all $pause-1-255-220-0" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%boolUE"></input><input type="%cs"></input></inputs><script><block s="doDeclareVariables"><list><l>breakpoint</l></list></block><block s="doIf"><block s="evaluate"><block var="test"/><list></list></block><script><block s="doSetVar"><l>breakpoint</l><block var="test"/></block><block s="doShowVar"><l>breakpoint</l></block><block s="doRun"><block var="action"/><list></list></block><block s="doPauseAll"></block><block s="doHideVar"><l></l></block></script></block></script></block-definition><block-definition s="word $arrowRight list %&apos;word&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%txt"></input></inputs><script><block s="doWarp"><script><block s="doReport"><block s="reportTextSplit"><block var="word"/><l><option>letter</option></l></block></block></script></block></script></block-definition><block-definition s="ignore %&apos;x&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs></block-definition><block-definition s="tell %&apos;sprite&apos; to %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="action"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask %&apos;sprite&apos; for %&apos;expression&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%repRing"></input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="expression"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="list $arrowRight word %&apos;list&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doReport"><block s="reportJoinWords"><block var="list"/></block></block></script></block></script></block-definition><block-definition s="activateTimer" type="command" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doResetTimer"></block><block s="doUntil"><block s="reportEquals"><block var="infected counter"/><block var="population size"/></block><script><block s="doSetVar"><l>time elapsed</l><block s="getTimer"></block></block></script></block><block s="doStopThis"><l><option>all but this script</option></l></block></script></block-definition><block-definition s="initialize" type="command" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doSetVar"><l>time elapsed</l><l>0</l></block><block s="doSetVar"><l>infected counter</l><l>0</l></block><block s="gotoXY"><l>0</l><l>0</l></block><block s="doAsk"><l>How many people in the population? Enter 1-200.</l></block><block s="doSetVar"><l>population size</l><block s="getLastAnswer"></block></block><block s="doAsk"><l>What percentage of the population is infected initially? Enter 1-100.</l></block><block s="doSetVar"><l>percent initially sick</l><block s="getLastAnswer"></block></block><block s="doAsk"><l>What is the speed of the people? Enter 1-10.</l></block><block s="doSetVar"><l>speed</l><block s="getLastAnswer"></block></block></script></block-definition><block-definition s="cloneInitialize" type="command" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><block s="doSwitchToCostume"><l>healthy</l></block><block s="doIf"><block s="reportLessThan"><block var="infected counter"/><block s="reportProduct"><block var="population size"/><block s="reportQuotient"><block var="percent initially sick"/><l>100</l></block></block></block><script><block s="doSwitchToCostume"><l>sick</l></block><block s="doChangeVar"><l>infected counter</l><l>1</l></block></script></block><block s="setHeading"><block s="reportRandom"><l>1</l><l>360</l></block></block><block s="gotoXY"><block s="reportRandom"><l>-240</l><l>240</l></block><block s="reportRandom"><l>-180</l><l>180</l></block></block></script></block-definition><block-definition s="collideWithSick?" type="predicate" category="other"><header></header><code></code><translations></translations><inputs></inputs><script><custom-block s="for each %upvar of %l %cs"><l>item</l><block s="reportGet"><l><option>neighbors</option></l></block><script><block s="doIf"><block s="reportAnd"><block s="reportTouchingObject"><block var="item"/></block><block s="reportEquals"><block s="reportAttributeOf"><l><option>costume name</option></l><block var="item"/></block><l>sick</l></block></block><script><block s="doReport"><block s="reportBoolean"><l><bool>true</bool></l></block></block></script></block></script></custom-block><block s="doReport"><block s="reportBoolean"><l><bool>false</bool></l></block></block></script></block-definition></blocks><variables><variable name="speed"><l>2</l></variable><variable name="population size"><l>100</l></variable><variable name="percent initially sick"><l>2</l></variable><variable name="time elapsed"><l>25.9</l></variable><variable name="infected counter"><l>28</l></variable></variables></project><media name="U5L2p3 Disease Spread" app="Snap! 6, https://snap.berkeley.edu" version="1"></media></snapdata>