我正在学习<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" BackColor="White" BorderColor="#999999" BorderStyle="None" BorderWidth="1px" CellPadding="3" DataSourceID="SqlDataSource1" GridLines="Vertical">
<AlternatingRowStyle BackColor="#DCDCDC" />
<Columns>
<asp:BoundField DataField="Group_Name" HeaderText="Group" SortExpression="Group_Name" />
<asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
<asp:BoundField DataField="Address" HeaderText="Address" SortExpression="Address" />
<asp:BoundField DataField="City" HeaderText="City" SortExpression="City" />
<asp:BoundField DataField="First_Phone_Number" HeaderText="1st Number" SortExpression="First_Phone_Number" />
<asp:BoundField DataField="Second_Phone_Number" HeaderText="2nd Number" SortExpression="Second_Phone_Number" />
<asp:BoundField DataField="Fax_Phone_Number" HeaderText="Fax Number" SortExpression="Fax_Phone_Number" />
<asp:BoundField DataField="Notes" HeaderText="Notes" SortExpression="Notes" />
<asp:TemplateField HeaderText="Attachments" ItemStyle-Width="30">
<ItemTemplate>
<asp:HyperLink runat="server" NavigateUrl='<%# Eval("Attachments", "~/HtmlAttachmentPage.html?Id+{0}") %>'
Text='<%# Eval("Attachments") %>' />
</ItemTemplate>
</asp:TemplateField>
</Columns>
并提出以下问题。我运行以下代码来找到最佳的多项式模型。
R代码有效。但是关于set.seed(123)
library(ISLR)
#####################################
# polynomial
rss <- rep(NA, 15)
fits <- list()
for (i in 1:15) {
fits[[i]] <- lm(mpg ~ poly(displacement, i), data = Auto)
rss[i] <- deviance(fits[[i]])
}
rss
anova(fits[[1]], fits[[2]], fits[[3]], fits[[4]], fits[[5]], fits[[6]], fits[[7]], fits[[8]], fits[[9]], fits[[10]], fits[[11]], fits[[12]], fits[[13]], fits[[14]], fits[[15]])
的最后一部分看起来似乎很乏味，如果适合包含大量元素则不实用。如何简化？
答案 0 :(得分：2)
通常，如果要将值列表转换为单独的参数，请使用do.call。因此，对于您的示例，您将运行
do.call("anova", fits)