diff --git a/.Rbuildignore b/.Rbuildignore
index 1a555ba..d9b4a00 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -3,3 +3,4 @@
 ^img/bigNetwork\.png$
 ^README\.md$
 ^docs$
+^\.Rproj\.user$
diff --git a/.gitignore b/.gitignore
index c066a39..8e3a7fd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 inst/doc
+.Rproj.user
diff --git a/R/sigmaAttrs.R b/R/sigmaAttrs.R
index 6c1f0b2..69dda5f 100644
--- a/R/sigmaAttrs.R
+++ b/R/sigmaAttrs.R
@@ -121,7 +121,8 @@ addNodeSize <- function(sigmaObj, minSize = 1, maxSize = 3, sizeMetric = 'degree
     sigmaObj$x$options$minNodeSize <- minSize
     sigmaObj$x$options$maxNodeSize <- maxSize
   } else{
-    tmp_graph <- igraph::graph_from_data_frame(sigmaObj$x$graph$edges)
+    tmp_graph <- igraph::graph_from_data_frame(sigmaObj$x$graph$edges,
+                                               directed = FALSE)
     if(sizeMetric == 'degree'){
       nodes$size <- igraph::degree(tmp_graph)
     } else if(sizeMetric == 'closeness'){
diff --git a/sigmaNet.Rproj b/sigmaNet.Rproj
index d848a9f..cba1b6b 100644
--- a/sigmaNet.Rproj
+++ b/sigmaNet.Rproj
@@ -5,8 +5,13 @@ SaveWorkspace: No
 AlwaysSaveHistory: Default
 
 EnableCodeIndexing: Yes
+UseSpacesForTab: Yes
+NumSpacesForTab: 2
 Encoding: UTF-8
 
+RnwWeave: Sweave
+LaTeX: pdfLaTeX
+
 AutoAppendNewline: Yes
 StripTrailingWhitespace: Yes