R中的If-else循环错误
我试图解决在hackerrank上发布的R中的If-else循环错误,r,loops,if-statement,dataframe,vector,R,Loops,If Statement,Dataframe,Vector,我试图解决在hackerrank上发布的R中比较三胞胎的问题 虽然我已经概述了整个步骤,但在hackerrank和RStudio中也没有给出正确的结果。有人能告诉我吗 可复制的例子 m = data.frame(ints = as.integer()) m <- structure(rbind(m,c(5,6,7)), .Names = names(m)) m <- structure(rbind(m,c(3,6,10)), .Names = names(m)) nam
R
中比较三胞胎的问题
虽然我已经概述了整个步骤,但在hackerrank和RStudio中也没有给出正确的结果。有人能告诉我吗
可复制的例子
m = data.frame(ints = as.integer())
m <- structure(rbind(m,c(5,6,7)), .Names = names(m))
m <- structure(rbind(m,c(3,6,10)), .Names = names(m))
names(m) = c("no1","no2","no3")
enter## the output gives m as below
`no1 no2 no3
1 5 6 7
2 3 6 10
## I need to compare the corresponding values in both rows
#if m[1,1] != m[2,1] then I need to store 1 in a vector or dataframe
#if m[1,2] != m[2,2] then I need to store 1 in a vector or dataframe
#if m[1,3] != m[2,3] then I need to store 1 in a vector or dataframe
#so We will get output as [1,1]
## defining a vector to store output as below
g = c(0,0,0)
g = c(0,0,0)
> g
[1] 0 0 0
> g[1]
[1] 0
## so my answer is as below
if(m[1,1]== m[2,1]))
{
print("nothing")
}
else
{
(g[1] = 1)
}
if((m[1,2]==m[2,2]))
{
print("nothing")
}
else
{
(g[2] = 1)
}
if((m[1,3]==m[2,3]))
{
print("nothing")
}
else
{
(g[3] = 1)
}
g = data.frame()
g = c(0,0,0)
任何人都能解释为什么它仍然将1作为中间值。在
R
中,行尾标记一条指令的结束,除非有开括号、大括号或未完成的指令,如else
,表示其他指令
试一试
或更短
if(m[1,1]== m[2,1])
print("nothing") else
g[1] = 1
在任何情况下,您的问题都可以通过以下方式得到更好的解决:
g <- as.numeric(m[1,] != m[2,])
# [1] 1 0 1
g感谢@Moody\u mudscappper对它的精彩解释。
if(m[1,1]== m[2,1])
print("nothing") else
g[1] = 1
g <- as.numeric(m[1,] != m[2,])
# [1] 1 0 1