Question

我是R.的新手。我正在尝试使用＆＃34; write.csv＆＃34;命令在R中写入一个csv文件。不幸的是，当我这样做时，结果数据框产生的字符串前缀为X，尽管该文件已经有一个列名。

它生成X_name1，X_name2

请告诉我你的建议

我添加了一个类似于我的数据的示例代码。

a<- c("1","2")
b <- c("3","4")
df <- rbind(a,b)
df <- as.data.frame(df)
names(df) <- c("11_a","12_b")
write.csv(df,"mydf.csv")
a <- read.csv("mydf.csv")
a

#Result
   X X11_a X12_b
1 a     1     2
2 b     3     4

我所需要的只是＆＃34; 11_a＆＃34;和＆＃34; 12_b＆＃34;作为列名。但它也包含前缀X.

Answer 1

在重新读取数据时使用check.names=FALSE - 在R中通常不接受以数字开头的名称：

read.csv(text="11_a,12_b
a,1,2
b,3,4", check.names=FALSE)

#  11_a 12_b
#a    1    2
#b    3    4

read.csv(text="11_a,12_b
a,1,2
b,3,4", check.names=TRUE)

#  X11_a X12_b
#a     1     2
#b     3     4

Answer 2

当您阅读.csv文件时，您所要做的就是将public static void main(String[] args) { Scanner s = new Scanner(System.in); String typeName = s.next(); //ask for type Class<?> type; try { type = Class.forName(typeName); } catch (ClassNotFoundException e) { System.out.printf("Class `%s` was not found%n", typeName); return; } //discover constructors Constructor<?>[] constructors = type.getConstructors(); for (int i = 0; i < constructors.length; ++i) { System.out.printf(" > %d %s%n", i, constructors[i]); } //select constructor and list its parameters int constructorIndex = s.nextInt(); Constructor<?> constructor = constructors[constructorIndex]; Type[] parameterTypes = constructor.getGenericParameterTypes(); for (Type parameterType : parameterTypes) { System.out.println(parameterType); //each type implementation requires a specific processing if (parameterType instanceof Class) { Class parameterClass = (Class) parameterType; if ((parameterClass).isPrimitive()) { //simple int primitive; which can be directly obtained from scanner if (Integer.TYPE.isAssignableFrom(parameterClass)) { System.out.println("\tinteger primitive > "); int value = s.nextInt(); System.out.println("\t you've entered " + value); } } else { Stream.of((parameterClass).getConstructors()).forEach(c -> System.out.printf("\t%s%n", c)); Stream.of((parameterClass).getDeclaredConstructors()).forEach(c -> System.out.printf("\t%s%n", c)); } } } // here we consider a sample java.lang.Integer class was requested with #0 constructor if (Integer.class.isAssignableFrom(type) && constructorIndex == 0) { System.out.println("Input an integer number: "); String value = s.next(); // since newInstance requires array of objects, we need to create an object (not primitive) Object instance; try { instance = constructor.newInstance(Integer.valueOf(value)); } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) { e.printStackTrace(); return; } System.out.printf("%s %s%n", instance.getClass(), instance); } }添加到您的代码中。它看起来像是：

header=TRUE

R中列名称的问题

2 个答案: