diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5b6a065
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+.Rproj.user
+.Rhistory
+.RData
+.Ruserdata
diff --git a/Class 4 - Swirl.Rproj b/Class 4 - Swirl.Rproj
new file mode 100644
index 0000000..8e3c2eb
--- /dev/null
+++ b/Class 4 - Swirl.Rproj	
@@ -0,0 +1,13 @@
+Version: 1.0
+
+RestoreWorkspace: Default
+SaveWorkspace: Default
+AlwaysSaveHistory: Default
+
+EnableCodeIndexing: Yes
+UseSpacesForTab: Yes
+NumSpacesForTab: 2
+Encoding: UTF-8
+
+RnwWeave: Sweave
+LaTeX: pdfLaTeX
diff --git a/addPatt.R b/addPatt.R
new file mode 100644
index 0000000..dcca0ae
--- /dev/null
+++ b/addPatt.R
@@ -0,0 +1,9 @@
+set.seed(678910)
+for(i in 1:40){
+  # flip a coin
+  coinFlip <- rbinom(1,size=1,prob=0.5)
+  # if coin is heads add a common pattern to that row
+  if(coinFlip){
+    dataMatrix[i,] <- dataMatrix[i,] + rep(c(0,3),each=5)
+  }
+}
\ No newline at end of file
diff --git a/lesson1.csv b/lesson1.csv
new file mode 100644
index 0000000..20ec91a
--- /dev/null
+++ b/lesson1.csv
@@ -0,0 +1,101 @@
+"time","answer","id"
+"1474557687574","install.packages(swirl)","Linh Doan"
+"1474557711359","library (swirl)","Linh Doan"
+"1474557759960","swirl()","Linh Doan"
+"1474558147506","swirl()","Linh Doan"
+"1474558225892","data.matrix()","Linh Doan"
+"1474558251139","View(dataMatrix)","Linh Doan"
+"1474558268641","head(dataMatrix)","Linh Doan"
+"1474558350845","heatmap()","Linh Doan"
+"1474558387616","heatmap(dataMatrix)","Linh Doan"
+"1474558439617","myedit addPatt.R","Linh Doan"
+"1474558456224","myedit (addPatt.R)","Linh Doan"
+"1474558473610","addPatt.R","Linh Doan"
+"1474558512036","info()","Linh Doan"
+"1474558542075","bye()","Linh Doan"
+"1474558548301","swirl()","Linh Doan"
+"1474558584844","menu()","Linh Doan"
+"1474558589221","info()","Linh Doan"
+"1474558591644","main()","Linh Doan"
+"1474558597554","main()","Linh Doan"
+"1474558602775","next()","Linh Doan"
+"1474558606606","bye()","Linh Doan"
+"1474558634698","swirl()","Linh Doan"
+"1474558673034","bye()","Linh Doan"
+"1474558677487","swirl()","Linh Doan"
+"1474558836086","?Devices","Linh Doan"
+"1474558914812","faithful eruptions waiting","Linh Doan"
+"1474558941363","faithful eruptions","Linh Doan"
+"1474558991643","head(faithful)","Linh Doan"
+"1474559018465","plot(faithful,eruptions)","Linh Doan"
+"1474559068855","with(faithful, plot(eruptions, waiting))","Linh Doan"
+"1474559095265","nxt()","Linh Doan"
+"1474559142429","title(main= Old Faith Ful Geyser data)","Linh Doan"
+"1474559148408","title(main= Old Faith Ful Geyser data"")
+1474559167164:tile
+1474559194643:bye()
+1474559200210:bye
+1474559216172:end
+1474559242207:title(main= Old Faith Ful Geyser data)
+1474559262294:title(main= Old Faith Ful Geyser data)
+1474559279561:title(main = Old Faithful Geyser data)
+1474559288119:dev.cur()
+1474559317965:pdf(file=myplot.pdf)
+1474559367839:pdf(file=myplot.pdf)
+1474559412760:with(faithful,plot(eruptions,waiting))
+1474559446620:title(main = Old Faithful)
+1474559458830:title(main = Old Faith Ful Geyser data)
+1474559473048:title(main = Old Faithful Geyser data)
+1474559517781:dev.cur()
+1474559525453:dev.off()
+1474559536600:dev.cur()
+1474559574322:with(faithful, plot(eruptions,waiting))
+1474559606366:title(main = Old Faithfil Geyser data)
+1474559618470:title(main = Old Faithful Geyser data)
+1474559677804:dev.copy(png, geyserplot.png)
+1474559689674:dev.copy(png, file = geyserplot.png)
+1474559710435:dev.off()
+1474559858117:bye()
+1474559923749:H <-read.table(~/.rstudio-desktop/history_database, sep=","Linh Doan"
+", fill=T, stringsAsFactors=F)
+1474559923761:names(H) <- c(time, answer)
+1474559923762:H$id <- Linh Doan
+1474559923763:write.csv(H, file = lesson1.csv, row.names = FALSE)
+1474560152708:library(swirl)
+1474560185231:swirl()
+1474560247228:install_course(R Programming)
+1474560258447:swirl()
+1474560326813:TRUE == TRUE
+1474560355618:(FALSE == TRUE) == FALSE
+1474560396924:(6==7)=FALSE
+1474560411030:6 == 7
+1474560424087:6 < 7
+1474560436598:10<=10
+1474560478137:5 != 7
+1474560548036:(5 != 7) == !FALSE
+1474560566962:! 5 == 7
+1474560670480:FALSE & FALSE
+1474560699438:TRUE & c(TRUE,FALSE, FALSE).
+1474560718655:TRUE & c(TRUE,FALSE,FALSE)
+1474560747198:TRUE && c(TRUE, FALSE, FALSE)
+1474560872332:TRUE | c(TRUE,FALSE,FALSE)
+1474560903189:TRUE || c(TRUE, FALSE, FALSE)
+1474560953044:5 > 8 || 6 != 8 && 4 > 3.9
+1474561227615:isTRUE(6>4)
+1474561373842:identical('twins', 'twins')
+1474561525790:xor(5 == 6, !FALSE)
+1474561644348:ints<- sample(10)
+1474561659275:display(ints)
+1474561677796:display()
+1474561696601:display (ints)
+1474561705361:ints
+1474561743262:ints > 5
+1474562208491:which (ints > 7)
+1474562247007:bye()
+1474562292836:H <-read.table(~/.rstudio-desktop/history_database, sep=",", fill=T, stringsAsFactors=F)
+1474562292849:names(H) <- c(time, answer)
+1474562292849:H$id <- Linh Doan
+1474562292850:write.csv(H, file = lesson1.csv, row.names = FALSE)
+1474562855700:H <-read.table(~/.rstudio-desktop/history_database, sep=","Linh Doan"
+", fill=T, stringsAsFactors=F)
+","","Linh Doan"
diff --git a/myplot.pdf b/myplot.pdf
new file mode 100644
index 0000000..bb02961
Binary files /dev/null and b/myplot.pdf differ