＆＃39; X＆＃39;必须是R中的数字直方图

Question

我有一个包含五个变量的数据集：Dataset，Biome，Species，Growth.form和N.content。我尝试仅使用N.content变量制作直方图，但我收到了错误：

Error in hist.default(Ndata, xlab = "Blader", ylab = "N.content", main = "N.content",  : 
'x' must be numeric

我做错了什么？

这是我的剧本：

mydata <- read.table("Leaf N content.txt", sep="\t", header=TRUE)
summary(mydata)
class(mydata)
str(mydata)
table(mydata$Growth.form)
table(mydata$Biome)
Sumdata <- as.data.frame(with(mydata, table(Biome, Growth.form))) 
table(Sumdata)
Ndata <- subset(mydata, select=c(N.content))
logdata <- log(Ndata)
par(mfrow=c(1,2)) 
hist(Ndata, xlab="Blader", ylab="N.content", main="N.content", col= "red")
hist(logdata, xlab="Blader", ylab="N.content", main="N.content", col= "red")

Answer 1

INFO: Deploying web application archive /usr/local/myapp/servers/tomcat-7/webapps/myapp.war Oct 26, 2015 9:45:26 AM org.apache.catalina.core.ContainerBase addChildInternal SEVERE: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/myapp]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1081) at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1877) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) at java.lang.Thread.run(Thread.java:662) Caused by: java.lang.IllegalStateException: Unable to complete the scan for annotations for web application [/myapp] due to a StackOverflowError. Possible root causes include a too low setting for -Xss and illegal cyclic inheritance dependencies. The class hierarchy being processed was [org.bouncycastle.asn1.ASN1EncodableVector->org.bouncycastle.asn1.DEREncodableVector->org.bouncycastle.asn1.ASN1EncodableVector] at org.apache.catalina.startup.ContextConfig.checkHandlesTypes(ContextConfig.java:2126) at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2072) at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:1947) at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1913) at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1898) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1330) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:889) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:386) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5380) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 11 more Oct 26, 2015 9:45:26 AM org.apache.catalina.startup.HostConfig deployWAR 是一个data.frame。 mydata返回data.frame。 subset(mydata, select=c(N.content))需要一个（数字）向量。使用hist选择列向量。