它是从顶部还是底部填充 [英] Does it fill from the top or bottom
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问题描述
我正在尝试将此MatLab代码转换为R.
I am trying to translate this MatLab code into R.
% ensure existing positions are carried forward
unless there is an exit signal positions=
fillMissingData(positions);
这是我所拥有的关于fillMissingData函数的信息:
Here is the information I have about the fillMissingData function:
function [filledPrices]=fillMissingData(prices)
% [filledPrices]=fillMissingData(prices) fill data in a 2-dim array with NaN's with the
% previous value.
filledPrices=prices;
for t=2:size(filledPrices, 1)
missData=~isfinite(filledPrices(t, :));
filledPrices(t, missData)=filledPrices(t-1, missData);
end
要执行该功能的对象是位置" 2列矩阵,其数据如下所示:
The object the function is performed on is "positions" a 2 column matrix with data that looks like this:
1 -1
1 -1
NaN NaN
NaN NaN
0 0
NaN NaN
1 -1
我的解决方案只是使用r代码:
My solutions is just to use the r code:
positions <- na.locf(positions, fromLast=FALSE)
填充以前的值,但是我不确定MatLab函数是否这样做,尤其是因为我被告知要携带0向前"
to fill with the previous value, but I am not sure if that is what the MatLab functions does, especially because I am told to "carry 0's forward"
请帮助!
推荐答案
将天真/单词到单词的R转换是
A naive/word-to-word translation to R would be
fillMissingData <- function(prices){
filledPrices=prices
for (t in 2:nrow(filledPrices)){
missData=is.na(filledPrices[t, ])
filledPrices[t, missData]=filledPrices[t-1, missData]
}
filledPrices
}
它的作用与na.locf(positions, fromLast=FALSE)
完全一样.
positions <- matrix(c(1, -1, 1, -1, NA, NA,NA, NA,0, 0,NA, NA, 1, -1), ncol=2, byrow=TRUE)
fillMissingData(positions)
# [,1] [,2]
#[1,] 1 -1
#[2,] 1 -1
#[3,] 1 -1
#[4,] 1 -1
#[5,] 0 0
#[6,] 0 0
#[7,] 1 -1
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