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varying learning-rate can handle online data sets.\n\n```r\nspcrl(data, m, eta, alpha)\n```\n\n## Arguments\n\n- `data`: is a online data set\n- `m`: is the number of principal component\n- `eta`: is the proportion of online data to total data\n- `alpha`: is the step size\n\n## Returns\n\nT2,T2k,V,Vhat,lambdahat,time\n\n\n\n## Examples\n\n```r\nlibrary(MASS)\nn <- 2000\np <- 20\nm <- 9\nmu <- t(matrix(rep(runif(p, 0, 1000), p, n)))\nmu0 <- as.matrix(runif(p, 0)) \nsigma0 <- diag(runif(p, 1, 10)) \nro <- as.matrix(c(runif(round(p/2), -1, -0.8), runif(p - round(p/2), 0.8, 1)))\nR0 <- ro %*% t(ro)\ndiag(R0) <- 1\nSigma0 <- sigma0 %*% R0 %*% sigma0 \nx <- mvrnorm(n, mu0, Sigma0)\ncolnames(x) <- paste0(\"x\", 1:p)\ne <- rnorm(n, 0, 1)\nB <- sample(1:3, (p + 1), replace = TRUE)\nen <- matrix(rep(1, n), ncol = 1)\ny <- cbind(en, x) %*% B + e\ncolnames(y) <- \"y\"\ndata <- data.frame(cbind(y, x))\nspcrl(data = data, m = m, eta = 0.8, alpha = 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