在Jupyter上使用R內核將筆記本導出到html時出現問題

Question

下面的代碼在編寫裝有R內核的ipython筆記本時工作正常。不幸的是，第二個barplot導出爲html失敗（兩者都嵌入了jupyter選項和手動使用nbconvert）。

library(NLP) 
library(tm) 

# here I used the EBook of Ulysses, by James Joyce, but any text file can fit 
# the text is available here: https://www.gutenberg.org/cache/epub/4300/pg4300.txt 
book <- readLines("pg4300.txt", encoding="UTF-8") 
corpus <- Corpus(VectorSource(book)) 
corpus <- tm_map(corpus, content_transformer(tolower)) 
corpus <- tm_map(corpus, removeNumbers) 
corpus <- tm_map(corpus, removePunctuation) 
dtm <- TermDocumentMatrix(corpus) 
m <- as.matrix(dtm) 

freq <- rowSums(m) 
freq.sorted <- sort(freq, decreasing=TRUE) 

# first barplot with stop words (ok for both notebook and export) 
barplot(freq.sorted[1:50], xlab="Word", ylab="Frequency", las=2) 

corpus.sw <- tm_map(corpus, removeWords, stopwords('english')) 
dtm.sw <- TermDocumentMatrix(corpus.sw) 
m.sw <- as.matrix(dtm.sw) 
freq.sw <- rowSums(m.sw) 
freq.sw.sorted <- sort(freq.sw, decreasing=TRUE) 

# second barplot without stop words (ok on ipython notebook but fail when exporting) 
barplot(freq.sw.sorted[1:50], xlab="Word", ylab="Frequency", las=2) 

什麼是很奇怪的，這是第一barplot良好出口，而不是第二個，而這個過程是完全一樣的（出50點強的話）。

這裏是我的配置：

• MacOSX的10.11.2埃爾卡皮坦
• jupyter 4.0.6
• IPython中4.0.1
• [R版本3.2.2

謝謝你，

Julien

Answer 1

由於這seems to be caused by how the svg plots are embedded in the html page，你也許可以解決此問題通過從繪圖選項移除SVG圖：

options(jupyter.plot_mimetypes = c("text/plain", "image/png")) # no more svg...