本文介绍了在自创的r函数中以矩阵形式获得结果的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧! 问题描述 下面的代码运行,但是不是返回(950数字值)我期望(想要)。在以下代码中, result 是72行3列的矩阵。 作为一个输出,我想要一个有72列和 长度(点) 行的矩阵。我尝试初始化 fcasts< - matrix(0,nrow = length(spots),ncol = 72),但代码不运行。 $ $ p $ y 库(预测) #寻找最佳模型 order.matrix< -matrix(0,nrow = 3,ncol = 6 * 2 * 6) aic.vec< ;(0:5中的(p为0:5))中的数字(6 * 2 * 6) k (a,b,a,a,a,a,a,a,a,a,a,a, q))) k } ind aic.vec order.matrix< - order.matrix [,ind] order.matrix< -t(order.matrix) result< - cbind(order.matrix,aic.vec) SlideFunction< - 函数(数据,窗口,步长){ 总计个点 fit #fcasts fcasts< - 数字(长度(点)) for(in 1:length(spots)){ fo r(j in 1:72){ p d q 注意我使用Arima(在预测包中)不是arima fit [[j]]< - Arima(data [spots [i] :( spots [i] +窗口)],order = c(p,d,q),method =CSS) fcasts [i] #I预期(想要)每个fcasts提前一步预测,即每个arima模型的商店价值。 $ return(fcasts) SlideFunction(y,50,1) 有人可以帮我解决这个问题吗? 解决方案我想这就是你想要的: pre $ SlideFunction< - function(data,window,step){$ (总数窗口),由=步骤) fcasts 个点 for(in 1:length(spots)){ for(j in 1:72){ p fit< - Arima(data [spots [i] :( spots [i] + window) ],order = c(p,d,q),method =CSS) fcasts [i,j] } } return(fcasts)} SlideFunction(y,50,1) 但完成需要相当长的时间,我没有耐心等待。我尝试使用较小的数据集: $ $ p $ y 和5而不是72,知道结果是正确的。 The following code runs, but does not return(950 numeric values) what I expected(want). In the following code result is a matrix of 72 rows and 3 columns. As an output, I would like to have a matrix with 72 columns and length(spots) rows. I tried initialising fcasts<- matrix(0, nrow=length(spots), ncol=72), but then code does not run. y<- ts(rnorm(1000),start = 1850, frequency=1)library(forecast)#Searching for the best modelsorder.matrix<-matrix(0,nrow = 3, ncol = 6 * 2 * 6) aic.vec<- numeric(6 * 2 * 6) k<-1 for(p in 0:5) for(d in 0:1) for(q in 0:5){ order.matrix[,k]<-c(p,d,q) aic.vec[k]<- AIC(Arima(y, order=c(p,d,q))) k<-k+1 } ind<- order(aic.vec,decreasing=F) aic.vec<- aic.vec[ind] order.matrix<- order.matrix[,ind]order.matrix<- t(order.matrix)result<- cbind(order.matrix,aic.vec)SlideFunction<- function(data, window, step){ total<- length(data) spots<- seq(from=1, to=(total-window), by=step) fit<- vector(mode="list",length=72) #fcasts<- matrix(0,nrow=length(spots),ncol=72) fcasts<- numeric(length(spots)) for(i in 1:length(spots)){ for(j in 1:72){ p<- result[j,1] d<- result[j,2] q<- result[j,3] #Note I am using Arima(in forecast package) not arima fit[[j]]<- Arima(data[spots[i]:(spots[i]+window)], order=c(p,d,q), method="CSS") fcasts[i]<- forecast(fit[[j]], h=step)$mean #I expected(would like to have) 72 one-step ahead prediction for each fcasts i.e, store values for each arima model. } } return(fcasts)}SlideFunction(y,50,1)Can someone please help me with this? 解决方案 I think this is what you want:SlideFunction<- function(data, window, step) { total<- length(data) spots<- seq(from=1, to=(total-window), by=step) fcasts<- matrix(0,nrow=length(spots),ncol=72) for(i in 1:length(spots)) { for(j in 1:72){ p<- result[j,1] d<- result[j,2] q<- result[j,3] fit <- Arima(data[spots[i]:(spots[i]+window)], order=c(p,d,q), method="CSS") fcasts[i, j] <- forecast(fit, h=step)$mean } } return(fcasts) }SlideFunction(y,50,1)But it takes quite a long time to finish and I don't have patience to wait. I tried using smaller data set:y<- ts(rnorm(100),start = 1850, frequency=1)and 5 instead of 72, knowing that the result is correct. 这篇关于在自创的r函数中以矩阵形式获得结果的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!
10-27 19:21