diff --git a/.Rbuildignore b/.Rbuildignore
new file mode 100644
index 0000000..13e458c
--- /dev/null
+++ b/.Rbuildignore
@@ -0,0 +1,2 @@
+^.*\.Rproj$
+^\.Rproj\.user$
diff --git a/.Rhistory b/.Rhistory
new file mode 100644
index 0000000..dcdd44e
--- /dev/null
+++ b/.Rhistory
@@ -0,0 +1,10 @@
+multi(5 * 10)
+a = 10
+b = 5
+multi(a, b)
+multi(5, 10)
+multi <- function(a, b) {
+return(a * b)
+}
+multi(5, 10)
+multi(a, b)
diff --git a/.Rproj.user/AB9CBA15/build_options b/.Rproj.user/AB9CBA15/build_options
new file mode 100644
index 0000000..df12568
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/build_options
@@ -0,0 +1,7 @@
+auto_roxygenize_for_build_and_reload="1"
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+preview_website="1"
+website_output_format="all"
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new file mode 100644
index 0000000..cd9e9bc
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/copilot_options
@@ -0,0 +1,2 @@
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new file mode 100644
index 0000000..0637a08
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+++ b/.Rproj.user/AB9CBA15/cpp-definition-cache
@@ -0,0 +1 @@
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new file mode 100644
index 0000000..67c7e1d
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/pcs/files-pane.pper
@@ -0,0 +1,9 @@
+{
+    "sortOrder": [
+        {
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+            "ascending": true
+        }
+    ],
+    "path": "//wsl.localhost/Ubuntu/home/tongwei/my.package"
+}
\ No newline at end of file
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new file mode 100644
index 0000000..902cc6f
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/pcs/source-pane.pper
@@ -0,0 +1,3 @@
+{
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+}
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new file mode 100644
index 0000000..2020128
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/pcs/windowlayoutstate.pper
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+{
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+}
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new file mode 100644
index 0000000..5376481
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/pcs/workbench-pane.pper
@@ -0,0 +1,6 @@
+{
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+    "TabSet2": 0,
+    "Sidebar": -1,
+    "TabZoom": {}
+}
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diff --git a/.Rproj.user/AB9CBA15/rmd-outputs b/.Rproj.user/AB9CBA15/rmd-outputs
new file mode 100644
index 0000000..3f2ff2d
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/rmd-outputs
@@ -0,0 +1,5 @@
+
+
+
+
+
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new file mode 100644
index 0000000..2b1bef1
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/saved_source_markers
@@ -0,0 +1 @@
+{"active_set":"","sets":[]}
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new file mode 100644
index 0000000..d2eaaac
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/per/t/C0DECDAF
@@ -0,0 +1,27 @@
+{
+    "id": "C0DECDAF",
+    "path": "//wsl.localhost/Ubuntu/home/tongwei/my.package/R/multiplication.R",
+    "project_path": "R/multiplication.R",
+    "type": "r_source",
+    "hash": "139293800",
+    "contents": "",
+    "dirty": false,
+    "created": 1770428466651.0,
+    "source_on_save": false,
+    "relative_order": 3,
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+        "Source": "Source",
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+    },
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+    "encoding": "UTF-8",
+    "collab_server": "",
+    "source_window": "",
+    "last_content_update": 1770428607528,
+    "read_only": false,
+    "read_only_alternatives": []
+}
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diff --git a/.Rproj.user/AB9CBA15/sources/per/t/C0DECDAF-contents b/.Rproj.user/AB9CBA15/sources/per/t/C0DECDAF-contents
new file mode 100644
index 0000000..5f0cdc2
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/per/t/C0DECDAF-contents
@@ -0,0 +1,3 @@
+multi <- function(a, b) {
+  return(a * b)
+}
diff --git a/.Rproj.user/AB9CBA15/sources/per/t/C4D448AE b/.Rproj.user/AB9CBA15/sources/per/t/C4D448AE
new file mode 100644
index 0000000..6088741
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/per/t/C4D448AE
@@ -0,0 +1,26 @@
+{
+    "id": "C4D448AE",
+    "path": "//wsl.localhost/Ubuntu/home/tongwei/my.package/man/add.Rd",
+    "project_path": "man/add.Rd",
+    "type": "r_doc",
+    "hash": "2546966182",
+    "contents": "",
+    "dirty": false,
+    "created": 1770428433117.0,
+    "source_on_save": false,
+    "relative_order": 2,
+    "properties": {
+        "source_window_id": "",
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+    },
+    "folds": "",
+    "lastKnownWriteTime": 1770428054,
+    "encoding": "UTF-8",
+    "collab_server": "",
+    "source_window": "",
+    "last_content_update": 1770428054,
+    "read_only": true,
+    "read_only_alternatives": [
+        "R/add.R"
+    ]
+}
\ No newline at end of file
diff --git a/.Rproj.user/AB9CBA15/sources/per/t/C4D448AE-contents b/.Rproj.user/AB9CBA15/sources/per/t/C4D448AE-contents
new file mode 100644
index 0000000..8c44358
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/per/t/C4D448AE-contents
@@ -0,0 +1,27 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/add.R
+\name{add}
+\alias{add}
+\title{This is my addition function}
+\usage{
+add(x, y)
+}
+\arguments{
+\item{x}{this is the first value to add}
+
+\item{y}{this is the second value to add}
+}
+\value{
+This function returns the sum of x and y
+}
+\description{
+This is my addition function
+}
+\examples{
+## Start with something simple
+add(1,1)
+
+## Now something more difficult
+add(49,60)
+
+}
diff --git a/.Rproj.user/AB9CBA15/sources/per/t/E4103D0B b/.Rproj.user/AB9CBA15/sources/per/t/E4103D0B
new file mode 100644
index 0000000..c528356
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/per/t/E4103D0B
@@ -0,0 +1,26 @@
+{
+    "id": "E4103D0B",
+    "path": "//wsl.localhost/Ubuntu/home/tongwei/my.package/DESCRIPTION",
+    "project_path": "DESCRIPTION",
+    "type": "dcf",
+    "hash": "83416843",
+    "contents": "",
+    "dirty": false,
+    "created": 1770428351810.0,
+    "source_on_save": false,
+    "relative_order": 1,
+    "properties": {
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+        "Source": "Source",
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+        "scrollLine": "0"
+    },
+    "folds": "",
+    "lastKnownWriteTime": 1770428909,
+    "encoding": "UTF-8",
+    "collab_server": "",
+    "source_window": "",
+    "last_content_update": 1770428909453,
+    "read_only": false,
+    "read_only_alternatives": []
+}
\ No newline at end of file
diff --git a/.Rproj.user/AB9CBA15/sources/per/t/E4103D0B-contents b/.Rproj.user/AB9CBA15/sources/per/t/E4103D0B-contents
new file mode 100644
index 0000000..864dd05
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/per/t/E4103D0B-contents
@@ -0,0 +1,14 @@
+Package: my.package
+Title: This is my first R package
+Version: 0.0.0.9000
+Authors@R: 
+    person(given = "Tongwei",
+           family = "Zhang",
+           role = c("aut", "cre"),
+           email = "tz415@gsbs.rutgers.edu",
+           comment = c(ORCID = "YOUR-ORCID-ID"))
+Description: This is my new package to do addition, subtraction, and multiplication
+License: Artistic 2.0
+Encoding: UTF-8
+LazyData: true
+RoxygenNote: 7.0.0
diff --git a/.Rproj.user/AB9CBA15/sources/prop/30438376 b/.Rproj.user/AB9CBA15/sources/prop/30438376
new file mode 100644
index 0000000..bb27690
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/prop/30438376
@@ -0,0 +1,4 @@
+{
+    "source_window_id": "",
+    "Source": "Source"
+}
\ No newline at end of file
diff --git a/.Rproj.user/AB9CBA15/sources/prop/75B21307 b/.Rproj.user/AB9CBA15/sources/prop/75B21307
new file mode 100644
index 0000000..390d5e2
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/prop/75B21307
@@ -0,0 +1,7 @@
+{
+    "tempName": "Untitled1",
+    "source_window_id": "",
+    "Source": "Source",
+    "cursorPosition": "3,0",
+    "scrollLine": "0"
+}
\ No newline at end of file
diff --git a/.Rproj.user/AB9CBA15/sources/prop/CF141F83 b/.Rproj.user/AB9CBA15/sources/prop/CF141F83
new file mode 100644
index 0000000..01b8fef
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/prop/CF141F83
@@ -0,0 +1,6 @@
+{
+    "source_window_id": "",
+    "Source": "Source",
+    "cursorPosition": "14,0",
+    "scrollLine": "0"
+}
\ No newline at end of file
diff --git a/.Rproj.user/AB9CBA15/sources/prop/INDEX b/.Rproj.user/AB9CBA15/sources/prop/INDEX
new file mode 100644
index 0000000..ff351dc
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/prop/INDEX
@@ -0,0 +1,3 @@
+%2F%2Fwsl.localhost%2FUbuntu%2Fhome%2Ftongwei%2Fmy.package%2FDESCRIPTION="CF141F83"
+%2F%2Fwsl.localhost%2FUbuntu%2Fhome%2Ftongwei%2Fmy.package%2FR%2Fmultiplication.R="75B21307"
+%2F%2Fwsl.localhost%2FUbuntu%2Fhome%2Ftongwei%2Fmy.package%2Fman%2Fadd.Rd="30438376"
diff --git a/.Rproj.user/AB9CBA15/sources/session-e4c9a144/C0DECDAF b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/C0DECDAF
new file mode 100644
index 0000000..9bcce65
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/C0DECDAF
@@ -0,0 +1,27 @@
+{
+    "id": "C0DECDAF",
+    "path": "//wsl.localhost/Ubuntu/home/tongwei/my.package/R/multiplication.R",
+    "project_path": "R/multiplication.R",
+    "type": "r_source",
+    "hash": "0",
+    "contents": "",
+    "dirty": false,
+    "created": 1770428466651.0,
+    "source_on_save": false,
+    "relative_order": 3,
+    "properties": {
+        "tempName": "Untitled1",
+        "source_window_id": "",
+        "Source": "Source",
+        "cursorPosition": "3,0",
+        "scrollLine": "0"
+    },
+    "folds": "",
+    "lastKnownWriteTime": 1770428607,
+    "encoding": "UTF-8",
+    "collab_server": "",
+    "source_window": "",
+    "last_content_update": 1770428607528,
+    "read_only": false,
+    "read_only_alternatives": []
+}
\ No newline at end of file
diff --git a/.Rproj.user/AB9CBA15/sources/session-e4c9a144/C0DECDAF-contents b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/C0DECDAF-contents
new file mode 100644
index 0000000..5f0cdc2
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/C0DECDAF-contents
@@ -0,0 +1,3 @@
+multi <- function(a, b) {
+  return(a * b)
+}
diff --git a/.Rproj.user/AB9CBA15/sources/session-e4c9a144/C4D448AE b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/C4D448AE
new file mode 100644
index 0000000..4b38e9c
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/C4D448AE
@@ -0,0 +1,24 @@
+{
+    "id": "C4D448AE",
+    "path": "//wsl.localhost/Ubuntu/home/tongwei/my.package/man/add.Rd",
+    "project_path": "man/add.Rd",
+    "type": "r_doc",
+    "hash": "0",
+    "contents": "",
+    "dirty": false,
+    "created": 1770428433117.0,
+    "source_on_save": false,
+    "relative_order": 2,
+    "properties": {
+        "source_window_id": "",
+        "Source": "Source"
+    },
+    "folds": "",
+    "lastKnownWriteTime": 1770428054,
+    "encoding": "UTF-8",
+    "collab_server": "",
+    "source_window": "",
+    "last_content_update": 1770428054,
+    "read_only": false,
+    "read_only_alternatives": []
+}
\ No newline at end of file
diff --git a/.Rproj.user/AB9CBA15/sources/session-e4c9a144/C4D448AE-contents b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/C4D448AE-contents
new file mode 100644
index 0000000..8c44358
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/C4D448AE-contents
@@ -0,0 +1,27 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/add.R
+\name{add}
+\alias{add}
+\title{This is my addition function}
+\usage{
+add(x, y)
+}
+\arguments{
+\item{x}{this is the first value to add}
+
+\item{y}{this is the second value to add}
+}
+\value{
+This function returns the sum of x and y
+}
+\description{
+This is my addition function
+}
+\examples{
+## Start with something simple
+add(1,1)
+
+## Now something more difficult
+add(49,60)
+
+}
diff --git a/.Rproj.user/AB9CBA15/sources/session-e4c9a144/E4103D0B b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/E4103D0B
new file mode 100644
index 0000000..c528356
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/E4103D0B
@@ -0,0 +1,26 @@
+{
+    "id": "E4103D0B",
+    "path": "//wsl.localhost/Ubuntu/home/tongwei/my.package/DESCRIPTION",
+    "project_path": "DESCRIPTION",
+    "type": "dcf",
+    "hash": "83416843",
+    "contents": "",
+    "dirty": false,
+    "created": 1770428351810.0,
+    "source_on_save": false,
+    "relative_order": 1,
+    "properties": {
+        "source_window_id": "",
+        "Source": "Source",
+        "cursorPosition": "14,0",
+        "scrollLine": "0"
+    },
+    "folds": "",
+    "lastKnownWriteTime": 1770428909,
+    "encoding": "UTF-8",
+    "collab_server": "",
+    "source_window": "",
+    "last_content_update": 1770428909453,
+    "read_only": false,
+    "read_only_alternatives": []
+}
\ No newline at end of file
diff --git a/.Rproj.user/AB9CBA15/sources/session-e4c9a144/E4103D0B-contents b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/E4103D0B-contents
new file mode 100644
index 0000000..864dd05
--- /dev/null
+++ b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/E4103D0B-contents
@@ -0,0 +1,14 @@
+Package: my.package
+Title: This is my first R package
+Version: 0.0.0.9000
+Authors@R: 
+    person(given = "Tongwei",
+           family = "Zhang",
+           role = c("aut", "cre"),
+           email = "tz415@gsbs.rutgers.edu",
+           comment = c(ORCID = "YOUR-ORCID-ID"))
+Description: This is my new package to do addition, subtraction, and multiplication
+License: Artistic 2.0
+Encoding: UTF-8
+LazyData: true
+RoxygenNote: 7.0.0
diff --git a/.Rproj.user/AB9CBA15/sources/session-e4c9a144/lock_file b/.Rproj.user/AB9CBA15/sources/session-e4c9a144/lock_file
new file mode 100644
index 0000000..e69de29
diff --git a/.Rproj.user/shared/notebooks/lock_file b/.Rproj.user/shared/notebooks/lock_file
new file mode 100644
index 0000000..e69de29
diff --git a/.Rproj.user/shared/notebooks/patch-chunk-names b/.Rproj.user/shared/notebooks/patch-chunk-names
new file mode 100644
index 0000000..e69de29
diff --git a/DESCRIPTION b/DESCRIPTION
index a5e6300..d176fd6 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,14 +1,14 @@
-Package: my.package
-Title: This is my first R package
-Version: 0.0.0.9000
-Authors@R: 
-    person(given = "Evan",
-           family = "Johnson",
-           role = c("aut", "cre"),
-           email = "wevanjohnson@gmail.com",
-           comment = c(ORCID = "YOUR-ORCID-ID"))
-Description: This is my new package to do addition, subtraction, and multiplication
-License: Artistic 2.0
-Encoding: UTF-8
-LazyData: true
-RoxygenNote: 7.0.0
+Package: my.package
+Title: This is my first R package
+Version: 0.0.0.9000
+Authors@R: 
+    person(given = "Tongwei",
+           family = "Zhang",
+           role = c("aut", "cre"),
+           email = "tz415@gsbs.rutgers.edu",
+           comment = c(ORCID = "YOUR-ORCID-ID"))
+Description: This is my new package to do addition, subtraction, and multiplication
+License: Artistic 2.0
+Encoding: UTF-8
+LazyData: true
+RoxygenNote: 7.0.0
diff --git a/R/multiplication.R b/R/multiplication.R
new file mode 100644
index 0000000..8e373f1
--- /dev/null
+++ b/R/multiplication.R
@@ -0,0 +1,3 @@
+multi <- function(a, b) {
+  return(a * b)
+}
diff --git a/my.package.Rproj b/my.package.Rproj
index cba1b6b..08d5ab1 100644
--- a/my.package.Rproj
+++ b/my.package.Rproj
@@ -1,21 +1,21 @@
-Version: 1.0
-
-RestoreWorkspace: No
-SaveWorkspace: No
-AlwaysSaveHistory: Default
-
-EnableCodeIndexing: Yes
-UseSpacesForTab: Yes
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-Encoding: UTF-8
-
-RnwWeave: Sweave
-LaTeX: pdfLaTeX
-
-AutoAppendNewline: Yes
-StripTrailingWhitespace: Yes
-
-BuildType: Package
-PackageUseDevtools: Yes
-PackageInstallArgs: --no-multiarch --with-keep.source
-PackageRoxygenize: rd,collate,namespace
+Version: 1.0
+
+RestoreWorkspace: No
+SaveWorkspace: No
+AlwaysSaveHistory: Default
+
+EnableCodeIndexing: Yes
+UseSpacesForTab: Yes
+NumSpacesForTab: 2
+Encoding: UTF-8
+
+RnwWeave: Sweave
+LaTeX: pdfLaTeX
+
+AutoAppendNewline: Yes
+StripTrailingWhitespace: Yes
+
+BuildType: Package
+PackageUseDevtools: Yes
+PackageInstallArgs: --no-multiarch --with-keep.source
+PackageRoxygenize: rd,collate,namespace