因此,假设我有一个简单的data.frame:
# Build stage
FROM maven:3.6.0-jdk-11-slim AS build
COPY pom.xml /app/
COPY src /app/src
RUN mvn -f /app/pom.xml clean package
# Run stage
FROM openjdk:8-jdk-alpine # Use your target JDK here !
COPY --from=build /app/target/app*.jar /app/app.jar
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app/app.jar"]
我想创建一个仅包含第一个向量中每个元素的第一个字母的新列。可以通过以下方式手动获取此新列:
vec1 <- c("SOL1","SOL2","SOL3","SOL4","AGN1","AGN2","AGN3","AGN4","AGN5")
vec2 <- c(1:9)
df1 <- data.frame(vec1,vec2)
谢谢