我必须遗漏dplyr mtcars %>% group_by( cyl, gear ) %>%
summarize( hp_range = max(hp) - min(mpg)) %>%
arrange( desc(hp_range) )
# Source: local data frame [8 x 3]
# Groups: cyl [3]
#
# cyl gear hp_range
# (dbl) (dbl) (dbl)
#1 4 4 87.6
#2 4 5 87.0
#3 4 3 75.5
#4 6 5 155.3
#5 6 4 105.2
#6 6 3 91.9
#7 8 5 320.0
#8 8 3 234.6
级hp_range被剥离的内容。在下面的示例中，我将2列分组，将值汇总到单个变量中，然后按该新变量排序：
desc显然，这不按预期按var isolateBindings = Object.keys(scope.$$isolateBindings || {});
var watchIsValid = $scope.$watchGroup(isolateBindings, function() {
console.log('do somthing');
});
排序。我错过了什么？
编辑：该示例按预期工作，未安排调用<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:ListView ID="CourseListView" runat="server" DataKeyNames="ID"
OnItemEditing="CourseListView_ItemEditing"
OnItemUpdating="CourseListView_ItemUpdating"
OnItemInserting="CourseListView_ItemInserting"
OnItemCanceling="CourseListView_ItemCanceling"
OnPagePropertiesChanging="PagePropertiesChanging" InsertItemPosition="LastItem"
>
<LayoutTemplate>
<table class="table" runat="server" id="tblCourse">
<tr id="itemPlaceholder" class="info" runat="server"></tr>
</table>
</LayoutTemplate>
<ItemTemplate>
<tr runat="server">
<td>
<asp:LinkButton ID="EditLink" runat="server" CommandName="Edit" Text="Edit" />
<asp:LinkButton ID="DeleteLink" runat="server" CommandName="Delete" Text="Delete" />
</td>
</tr>
<tr runat="server">
<td class="col-md-4">
CourseName:
<asp:Label ID="CourseNameLabel" runat="server" Text='<%#Eval("CourseName") %>'/>
<br />
Discription:
<asp:Label ID="DescriptionLabel" runat="server" Text='<%#Eval("Description") %>'/>
<br />
StartDate:
<asp:Label ID="StartDateLabel" runat="server" Text='<%#Eval("StartDate") %>'/>
<br />
EndDate:
<asp:Label ID="EndDateLabel" runat="server" Text='<%#Eval("EndDate") %>' />
<br />
CourseMode:
<asp:Label ID="CourseModeLabel" runat="server" Text='<%#Eval("CourseMode") %>'/>
</td>
</tr>
</ItemTemplate>
<EditItemTemplate>
<tr runat="server">
<td>
<asp:LinkButton ID="UpdateLink" runat="server" CommandName="Update" Text="Update" />
<asp:LinkButton ID="CancleLink" runat="server" CommandName="Cancel" Text="Cancel" />
</td>
<td>
<asp:Label ID="IDLabel" runat="server" Text='<%#Eval("ID") %>'/>
</td>
<td >
<asp:TextBox ID="CourseNameTextBox" runat="server" Text='<%#Eval("CourseName") %>'></asp:TextBox>
</td>
</tr>
<tr runat="server">
<td>
<asp:TextBox ID="DescriptionTextBox" runat="server" Text='<%#Eval("Description")%>'></asp:TextBox>
<br />
<asp:TextBox ID="StartDateTextBox" runat="server" Text='<%#Eval("StartDate") %>'></asp:TextBox>
<br />
<asp:TextBox ID="EndDateTextBox" runat="server" Text='<%#Eval("EndDate") %>'></asp:TextBox>
<br />
<asp:DropDownList ID="CourseModeDdl" runat="server">
<asp:ListItem>ClassRoom</asp:ListItem>
<asp:ListItem>ELearning</asp:ListItem>
<asp:ListItem>Online</asp:ListItem>
</asp:DropDownList>
<br />
</td>
</tr>
</EditItemTemplate>
<EmptyDataTemplate>
<hr />
No Records Found.<hr />
<asp:LinkButton ID="InsertLink" runat="server" Text="Insert Records" CommandName="Insert" />
</EmptyDataTemplate>
<InsertItemTemplate>
<tr runat="server">
<td >
CourseName:
<asp:TextBox ID="CourseNameTextBox" runat="server" Text='<%#Eval("CourseName") %>'></asp:TextBox>
<br />
Description:
<asp:TextBox ID="DescriptionTextBox" runat="server" Text='<%#Eval("Description")%>'></asp:TextBox>
<br/>
StartDate:
<asp:TextBox ID="StartDateTextBox" runat="server" Text='<%#Eval("StartDate") %>'></asp:TextBox>
<br/>
EndDate:
<asp:TextBox ID="EndDateTextBox" runat="server" Text='<%#Eval("EndDate") %>'></asp:TextBox>
<br />
CourseMode:
<asp:DropDownList ID="CourseModeDdl" runat="server" >
<asp:ListItem>ClassRoom</asp:ListItem>
<asp:ListItem>ELearning</asp:ListItem>
<asp:ListItem>Online</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
</InsertItemTemplate>
</asp:ListView>
<asp:DataPager runat="server" ID="DataPager1" PageSize="5" PagedControlID="CourseListView">
<Fields>
<asp:NumericPagerField
ButtonCount="5"
PreviousPageText="<--"
NextPageText="-->" />
</Fields>
</asp:DataPager>
。还不清楚为什么？
答案 0 :(得分：8)
好的，刚刚到底：
desc的调用没有任何效果，如果没有它，示例就无法运行关键是，当您group_by多个列时，似乎结果会自动按组排序。在上面的示例中，它按cyl排序。要获得整个数据表的预期排序，您必须先ungroup然后arrange
mtcars %>% group_by( cyl, gear ) %>%
summarize( hp_range = max(hp) - min(mpg)) %>%
ungroup() %>%
arrange( hp_range )