[英]R - svd() function - infinite or missing values in 'x'
I am constantly getting this error. 我经常遇到这个错误。 I am sure the matrix does not have any non-numeric entries.
我确信矩阵没有任何非数字条目。 I also tried imputing the matrix, did not work.
我也尝试过输入矩阵,没用。
Anyone know what the error might be? 任何人都知道错误可能是什么?
fileUrl <- "https://dl.dropboxusercontent.com/u/76668273/kdd.csv";
download.file(fileUrl,destfile="./kdd.csv",method="curl");
kddtrain <- read.csv("kdd.csv");
kddnumeric <- kddtrain[,sapply(kddtrain,is.numeric)];
kddmatrix <- as.matrix(kddnumeric);
svd1 <- svd(scale(kddmatrix));
You have columns composed of all zeroes. 您有由全零组成的列。 Using
scale
on a column of all zeroes returns a column composed of NaN
. 在全零的列上使用
scale
返回由NaN
组成的列。 To solve this, remove columns where you have all zeroes ( svd
will not reveal anything new about them), or replace NaN
columns with zero after using scale
. 要解决此问题,请删除全部为零的列(
svd
不会显示任何有关它们的新内容),或者在使用scale
后将NaN
列替换为零。
Reproducible example: 可重复的例子:
mat <- matrix(c(1,2,3,0,0,0,2,4,6,5,12,13),nrow = 3)
# [,1] [,2] [,3] [,4]
# [1,] 1 0 2 5
# [2,] 2 0 4 12
# [3,] 3 0 6 13
scale(mat)
# [,1] [,2] [,3] [,4]
# [1,] -1 NaN -1 -1.1470787
# [2,] 0 NaN 0 0.4588315
# [3,] 1 NaN 1 0.6882472
# attr(,"scaled:center")
# [1] 2 0 4 10
# attr(,"scaled:scale")
# [1] 1.000000 0.000000 2.000000 4.358899
svd(mat) #fine
svd(scale(mat)) # not fine
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