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coefficients from covariates.\n\n\n```r\nenv_get(X, f, frq, nbase)\n```\n\n## Arguments\n\n- `X`: A numeric matrix of predictors (N × p).\n- `f`: A numeric matrix of cepstral coefficients (N × nbase).\n- `frq`: Numeric vector of frequencies in `[0,1]`.\n- `nbase`: Number of Fourier basis functions.\n\n## Returns\n\nA list containing:\n\n- **`alph`**: Intercept vector.\n- **`bet`**: Envelope regression coefficient matrix.\n- **`spechat`**: Estimated smoothed log-spectra.\n- **`res`**: Residuals from envelope model.\n\n\n\n## Examples\n\n```r\nlibrary(Renvlp)\n\nset.seed(123)\nfrq <- seq(0, 1, length.out = 16)[2:8]\nn <- 15\np <- 3\nnbase <- 5\nX <- matrix(rnorm(n * p), n, p)\nf <- matrix(rnorm(n * nbase), n, nbase)\n\nu_max <- min(ncol(X), ncol(f))\ncv_errors <- numeric(u_max)\nfor (j in 1:u_max) {\n cv_errors[j] <- cv.xenv(X, f, j, m = 5, nperm = 10)\n}\noptimal_u <- which.min(cv_errors)\n\nenv_result <- env_get(X, f, frq, nbase = 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