我有数据框A
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:fab="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/vDrawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/background"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<android.support.design.widget.CoordinatorLayout
android:id="@+id/vCoordinator"
style="@style/Layout.Coordinator"
tools:context="io.stepuplabs.settleup.ui.main.MainActivity">
<io.stepuplabs.settleup.ui.main.StateAwareAppBar
android:id="@+id/vAppBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/vCollapsingToolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorAccent"
app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed|exitUntilCollapsed|snap">
<ImageView
android:id="@+id/vPlaceholderCircles"
android:layout_width="match_parent"
android:layout_height="296dp"
android:contentDescription="@string/desc_circles"
android:scaleType="centerCrop"
android:src="@drawable/placeholder"
app:layout_collapseMode="none"
/>
<android.support.v7.widget.Toolbar
android:id="@+id/vToolbar"
style="@style/Layout.Toolbar"
android:layout_marginBottom="40dp"
app:layout_collapseMode="pin"
app:layout_collapseParallaxMultiplier="1"
app:popupTheme="@style/AppTheme.PopupOverlay">
<TextView
android:id="@+id/vWhoShouldPayTitle"
android:layout_width="wrap_content"
android:visibility="gone"
android:layout_height="wrap_content"
android:layout_gravity="start"
android:text="@string/app_name"
android:textAppearance="@style/Text.Toolbar" />
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="@+id/vTabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0"
app:tabIndicatorColor="@color/white"
app:tabMode="scrollable" />
</android.support.design.widget.CollapsingToolbarLayout>
</io.stepuplabs.settleup.ui.main.StateAwareAppBar>
<android.support.v4.view.ViewPager
android:id="@+id/vViewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
<android.support.v4.widget.ContentLoadingProgressBar
android:id="@+id/vActivityProgress"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" />
<com.github.clans.fab.FloatingActionMenu
android:id="@+id/vFloatingActionMenu"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="bottom|end"
android:contentDescription="@string/expense"
android:paddingBottom="10dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
app:layout_behavior="io.stepuplabs.settleup.ui.common.FloatingActionMenuBehavior"
fab:menu_animationDelayPerItem="0"
fab:menu_backgroundColor="@color/dim"
fab:menu_buttonSpacing="6dp"
fab:menu_fab_label="@string/expense"
fab:menu_icon="@drawable/fab_add"
fab:menu_labels_cornerRadius="30dp"
fab:menu_labels_ellipsize="end"
fab:menu_labels_paddingBottom="8dp"
fab:menu_labels_paddingLeft="16dp"
fab:menu_labels_paddingRight="16dp"
fab:menu_labels_paddingTop="8dp"
fab:menu_labels_position="left"
fab:menu_labels_textColor="@color/white"
fab:menu_labels_textSize="14sp">
<com.github.clans.fab.FloatingActionButton
android:id="@+id/vFabTransfer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:contentDescription="@string/transfer"
android:src="@drawable/ic_transfer"
fab:fab_label="@string/transfer"
fab:fab_size="mini" />
</com.github.clans.fab.FloatingActionMenu>
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.NavigationView
android:id="@+id/vNavigationDrawer"
android:layout_width="280dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="@color/white"
android:fitsSystemWindows="true"
app:headerLayout="@layout/drawer_header"
app:itemBackground="@drawable/selector_items_background_color"
app:itemIconTint="@color/selector_drawer_items_foreground_color"
app:itemTextColor="@color/selector_drawer_items_foreground_color"
app:menu="@menu/drawer" />
</android.support.v4.widget.DrawerLayout>
另一个带时间戳的数据框B
structure(list(gauge = c(1094000L, 1094000L, 1094000L, 1100600L
), start = structure(c(2L, 4L, 1L, 3L), .Label = c("4/16/2007 18:45",
"4/2/2004 12:45", "4/24/2012 9:15", "5/14/2006 21:00"), class = "factor")), .Names = c("gauge",
"start"), row.names = c(NA, 4L), class = "data.frame")
我想
使用lubridate，我将A中的时间戳转换为UTC：
structure(list(Time = structure(1:20, .Label = c("2002-01-01 00:00",
"2002-01-01 00:05", "2002-01-01 00:10", "2002-01-01 00:15", "2002-01-01 00:20",
"2002-01-01 00:25", "2002-01-01 00:30", "2002-01-01 00:35", "2002-01-01 00:40",
"2002-01-01 00:45", "2002-01-01 00:50", "2002-01-01 00:55", "2002-01-01 01:00",
"2002-01-01 01:05", "2002-01-01 01:10", "2002-01-01 01:15", "2002-01-01 01:20",
"2002-01-01 01:25", "2002-01-01 01:30", "2002-01-01 01:35"), class = "factor"),
Precip.mm.h..1. = c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0)), .Names = c("Time", "Precip.mm.h..1."
), row.names = c(NA, 20L), class = "data.frame")
但我不确定如何比较两个时间戳。
P.S。 B是一个包含一百万行的非常大的文件。所以我无法为你提供A的相应数据。