[英]How to get rows of a dataframe that contain values between two other values?
So I want to find values in a column of a data.frame, which are in range of defined values: 所以我想在data.frame的列中找到值,这些值在定义的值范围内:
example
[1] 6 2 4 3 5 1
pos
[1] 1 3 2
I now want to get the values of example for which BOTH of the following statements are TRUE, so that I got only values that lie between pos - 1
and pos +1
: 我现在想得到以下语句的BOTH为TRUE的示例值,这样我只得到位于
pos - 1
和pos +1
pos - 1
之间的值:
if(example < pos - 1)
if(example > pos + 1)
And now the real values for my task are within a data.frame. 现在我的任务的真正价值在data.frame中。 How do I extract the complete rows, which contain these values and build a new pos
data.frame
. 如何提取包含这些值的完整行并构建新的pos
data.frame
。
The expected output for the example would be: 该示例的预期输出将是:
result
[1] 2 3 1
Thanks in advance! 提前致谢!
Set min and max thresholds and then compare each element against them 设置最小和最大阈值,然后将每个元素与它们进行比较
maxind <- max(pos + 1)
minind <- min(pos - 1)
Then 然后
example[sapply(example, function(x) x > minind & x < maxind)]
## [1] 2 3 1
Or, similarly 或者,类似地
example[example > minind & example < maxind]
## [1] 2 3 1
Or using data.table
或者使用
data.table
library(data.table)
example[between(example, minind, maxind, incbounds = FALSE)]
## [1] 2 3 1
So the solution as suggested by @David Arenburg is like this: 所以@David Arenburg建议的解决方案是这样的:
indx <- sapply(example[, 4], function(x) any(x < pos + 1) & any(x > pos - 1))
Then just do 然后就做
example[indx,]
This will search a data.frame in the specified column for values that are in the defined range and will just give you the rows of your desire! 这将搜索指定列中的data.frame,以查找定义范围内的值,并为您提供所需的行!
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