Question

for (i in 1:length(mdma4)) 
{
result <- mdma$MRP.Area[grepl(mdma4[i], mdma$Material)] 
result <- unique(result)
result <- rbind(data.frame(as.list(result)))
write.table(result, file = "mrp_area_missing.csv", append = TRUE,sep = ",")
}

我需要编写csv文件在每次循环迭代期间，它应该在文件中添加一行上面的代码，正在创建单行文件请帮忙

Answer 1

将结果放在数据框中并在循环外写入数据框。它更有效，更容易。

buildscript {    // Configuration for building
    repositories {
        jcenter()    // Bintray's repository - a fast Maven Central mirror & more
        mavenCentral()
    }
    dependencies {
        classpath 'com.google.cloud.tools:appengine-gradle-plugin:+'    // latest App Engine Gradle tasks
    }
}

repositories {   // repositories for Jar's you access in your code
    maven {
        url 'https://maven-central.storage.googleapis.com'             // Google's mirror of Maven Central
//   url 'https://oss.sonatype.org/content/repositories/snapshots' // SNAPSHOT Repository (if needed)
    }
    jcenter()
    mavenCentral()
}

apply plugin: 'java'                              // standard Java tasks
apply plugin: 'war'                               // standard Web Archive plugin
apply plugin: 'com.google.cloud.tools.appengine'  // App Engine tasks

dependencies {
    providedCompile group: 'javax.servlet', name: 'servlet-api', version:'2.5'
    compile 'com.google.appengine:appengine:+'

    compile "org.apache.httpcomponents:httpclient:4.5.3"
    compile "org.apache.commons:commons-lang3:3.5"
    compile "com.google.code.gson:gson:2.8.0"

    // https://mvnrepository.com/artifact/com.google.appengine/appengine-api-1.0-sdk
    compile group: 'com.google.appengine', name: 'appengine-api-1.0-sdk', version: '1.2.0'

    testCompile 'junit:junit:4.12'

    testCompile group: 'junit', name: 'junit', version: '4.12'

}

appengine {  // App Engine tasks configuration

    run {      // local (dev_appserver) configuration (standard environments only)
        port = 8080                 // default
    }

    deploy {   // deploy configuration
        stopPreviousVersion = true  // default - stop the current version
        promote = true              // default - & make this the current version
    }

    //tools.cloudSdkHome = '/Applications/google-cloud-sdk'
}

group 'xxx'
version 'xxx'

sourceCompatibility = 1.7  // App Engine Standard uses Java 7
targetCompatibility = 1.7  // App Engine Standard uses Java 7

在每次迭代for循环中在csv中写入新行

1 个答案: