[英]Replace all specific values in data.frame with values from another data.frame sequentially R
I have a data.frame (df1) and I want to include a single, most recent age for each of my samples from another data.frame (df2):我有一个 data.frame (df1),我想为来自另一个 data.frame (df2) 的每个样本包含一个最近的年龄:
df1$age <- df2$age_9[match(df1$Sample_ID, df2$Sample_ID)]
The problem is that in df2 there are 9 columns for age, as each one indicates the age at a specific check-up date (age_1 is from the first visit, age_9 is the age at the 9th visit) and patients dont make all their visits.问题是在 df2 中有 9 列年龄,因为每列表示特定检查日期的年龄(age_1 是从第一次就诊开始,age_9 是第 9 次就诊时的年龄)并且患者不会进行所有就诊.
How do I add the most recently obtained age from a non empty check up date?如何从非空检查日期添加最近获得的年龄?
aka, if age_9 == "."又名,如果 age_9 == "." replace "."
代替 ”。” with age_8 then if age_8 == "."
与 age_8 那么如果 age_8 == "." replace "."
代替 ”。” with age_7... etc
与年龄_7 ...等
From this:由此:
View(df1)
Sample Age
1 50
2 .
3 .
To:至:
View(df1)
Sample Age
1 50
2 49
3 30
From the data df2从数据df2
View(df2)
Sample Age_1 Age_2 Age_3
1 40 42 44
2 35 49 .
3 30 . .
This is my attempt:这是我的尝试:
df1$age[which(df1$age == ".")] <- df2$age_8[match(df1$Sample_ID, df2$Sample_ID)]
With base R
, we can use max.col
to return the last
column index for each row, where the 'Age' columns are not .
使用
base R
,我们可以使用max.col
返回每行的last
列索引,其中“年龄”列不是.
, cbind
with sequence of rows to return a row/column index, extract the elements and change the 'Age' column in 'df1', where the 'Age' is .
,
cbind
与行序列返回行/列索引,提取元素并更改 'df1' 中的 'Age' 列,其中 'Age' 为.
df1$Age <- ifelse(df1$Age == ".", df2[-1][cbind(seq_len(nrow(df2)),
max.col(df2[-1] != ".", "last"))], df1$Age)
df1 <- type.convert(df1, as.is = TRUE)
-output -输出
df1
# Sample Age
#1 1 50
#2 2 49
#3 3 30
or using tidyverse
by reshaping into 'long' format and then do a join after slice
ing the last row grouped by 'Sample'或通过将
tidyverse
重塑为“long”格式使用 tidyverse,然后在slice
将最后一行按“Sample”分组后进行连接
library(dplyr)
library(tidyr)
df2 %>%
mutate(across(starts_with('Age'), as.integer)) %>%
pivot_longer(cols = starts_with('Age'), values_drop_na = TRUE) %>%
group_by(Sample) %>%
slice_tail(n = 1) %>%
ungroup %>%
select(-name) %>%
right_join(df1) %>%
transmute(Sample, Age = coalesce(as.integer(Age), value))
-output -输出
# A tibble: 3 x 2
# Sample Age
# <int> <int>
#1 1 50
#2 2 49
#3 3 30
df1 <- structure(list(Sample = 1:3, Age = c("50", ".", ".")),
class = "data.frame",
row.names = c(NA,
-3L))
df2 <- structure(list(Sample = 1:3, Age_1 = c(40L, 35L, 30L), Age_2 = c("42",
"49", "."), Age_3 = c("44", ".", ".")), class = "data.frame",
row.names = c(NA,
-3L))
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