[英]How to solve error factor has bad level in R
I have some difficulties applying the inhomogeneous G-function to my point pattern in R
.我在R
非均匀 G 函数应用于我的点模式时遇到了一些困难。 In order to use GmultiInhom
, I first tried to convert my point pattern bci.tree8pppa
to a multitype pattern:为了使用GmultiInhom
,我首先尝试将我的点模式bci.tree8pppa
转换为多类型模式:
bci.tree8multi = ppp(bci.tree8pppa$x, bci.tree8pppa$y, window=owin(c(0,1000), c(0,500)), marks = factor(bci.tree8pppa$marks[,3]))
Then applied the G-function as follows:然后应用G函数如下:
G = GmultiInhom(bci.tree8multi, marks(bci.tree8multi) == species1, marks(bci.tree8multi) == species2, lambdaI = lambda1points, lambdaJ = lambda2points, lambdamin = min(lambda2points), r = c(0,r1,r2,r3))
But this yields the error: "Error in split.default(X, group): factor has bad level"
但这会产生错误: "Error in split.default(X, group): factor has bad level"
How can I solve this?我该如何解决这个问题? Thank you in advance!先感谢您!
For the benefit of any R
programmers out there: I traced the error message "factor has bad level"
to the C source code for .Internal(split.default(x,f))
in the base R
system.为了任何R
程序员的利益:我在基础R
系统中的.Internal(split.default(x,f))
的 C 源代码中追踪了错误消息"factor has bad level"
。 This error message can occur only when f
is a list
rather than a factor
.仅当f
是list
而不是factor
时,才会出现此错误消息。 The code converts f
to a factor using the function interaction
which performs character string manipulations.该代码使用执行字符串操作的 function interaction
将f
转换为因子。 This conversion can go wrong, in the sense that the resulting factor has "bad levels": the integer representation of the factor includes values less than 1 or greater than the number of levels of the factor.这种转换可能 go 是错误的,因为结果因子具有“不良水平”:因子的 integer 表示包括小于 1 或大于因子水平数的值。 Then the error occurs.然后发生错误。
The original post has not provided a working example, so it's difficult to figure out exactly how the code in spatstat::GmultiInhom
caused the wrong type of data to be fed to split.default
.原始帖子没有提供一个工作示例,因此很难弄清楚spatstat::GmultiInhom
中的代码是如何导致将错误类型的数据提供给split.default
。 However, it must be related to the misuse of the argument r
.但是,它必须与参数r
的滥用有关。 The code in spatstat
will be tightened to enforce stricter requirements on the format of r
. spatstat
中的代码将被收紧,以对r
的格式执行更严格的要求。
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