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为什么这在 LyX 2.1.3 中失败但在 .Rnw 中却有效？

tag-icon • tag-icon lyx r knitr rnw
为什么这在 LyX 2.1.3 中失败但在 .Rnw 中却有效？

此代码在 中运行良好，.Rnw但在 中不起作用LyX 2.1.3。在 LyX 2.1.3 中，它会引发以下错误：

Error in getModel.baseGmm(all_args, ...): could not find function "is"

知道如何解决这个问题吗？提前感谢您的帮助。

%% LyX 2.1.2 created this file.  For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\documentclass{article}
\usepackage[sc]{mathpazo}
\usepackage[T1]{fontenc}
\usepackage{geometry}
\geometry{verbose,tmargin=2.5cm,bmargin=2.5cm,lmargin=2.5cm,rmargin=2.5cm}
\setcounter{secnumdepth}{2}
\setcounter{tocdepth}{2}
\usepackage{url}
\usepackage[unicode=true,pdfusetitle,
 bookmarks=true,bookmarksnumbered=true,bookmarksopen=true,bookmarksopenlevel=2,
 breaklinks=false,pdfborder={0 0 1},backref=false,colorlinks=false]
 {hyperref}
\hypersetup{
 pdfstartview={XYZ null null 1}}
\begin{document}
<<setup, include=FALSE, cache=FALSE>>=
library(knitr)
# set global chunk options
opts_chunk$set(fig.path='figure/minimal-', fig.align='center', fig.show='hold')
options(formatR.arrow=TRUE,width=90)
@


\title{A Minimal Demo of knitr}


\author{Yihui Xie}

\maketitle
You can test if \textbf{knitr} works with this minimal demo. OK, let's
get started with some boring random numbers:

<<boring-random>>=
library(gmm)

# Random numbers of a normal distribution
# First we generate normally distributed random numbers and compute the two parameters:
n <- 1000
x <- rnorm(n, mean = 4, sd = 2)
# Implementing the 3 moment conditions
g <- function(tet, x)
{
  m1 <- (tet[1] - x)
  m2 <- (tet[2]^2 - (x - tet[1])^2)
  m3 <- x^3 - tet[1]*(tet[1]^2 + 3*tet[2]^2)
  f <- cbind(m1, m2, m3)
  return(f)
}
# Implementing the jacobian
Dg <- function(tet, x)
{
  jacobian <- matrix(c( 1, 2*(-tet[1]+mean(x)), -3*tet[1]^2-3*tet[2]^2,0, 2*tet[2],
                        -6*tet[1]*tet[2]), nrow=3,ncol=2)
  return(jacobian)
}
# Now we want to estimate the two parameters using the GMM.
gmm(g, x, c(0, 0), grad = Dg)
@

\end{document}

答案1

is是一个函数方法包，所以你必须

library(methods)

这方法如果 R 脚本从以下位置执行Rscript，则默认情况下不会加载包：?Rscript。这就是 LyX 调用 R 加载的方式针织品并编纂该文件。

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