HotellingEllipse 1.2.0

Updates:

• Fixed issue #3
• Improved package documentation.
• Added more robust checks for input types and values
• Added an is_integer function that uses implicit integer division. When a number is divided by 1 using integer division (%/%), the result will be equal to the original number only if it's an integer. The is_integer function is used to check k, pcx, and pcy.
• Improved error messages to be more informative and specific.
• Converted input to matrix once at the beginning to avoid repeated conversions.
• For both ellipseParam and ellipseCoord functions, the code is restructured into smaller, more focused functions for better readability and maintainability.
• Extracted the columns x[, pcx] and x[, pcy] into separate vectors x_col and y_col before using them in the calculations. Use drop = TRUE to ensure that even if x is a single-column matrix, it's converted to a vector.
• Added three new parameters for the ellipseParam function: threshold, real.tol, and abs.tol. The threshold parameter selects the minimum number of k components that cumulatively explain at least the specified proportion of variance. As for the two tolerance parameters, rel_tol (for relative tolerance) and abs_tol (for absolute tolerance), serve as variance threshold of components deemed negligible if their variance is below EITHER of these thresholds.
• Implemented a three-dimensional extension to the ellipseCoord function by introducing a third axis parameter, pcz. This addition enables the computation of coordinates for 3D ellipsoids, expanding the function's capabilities beyond its previous 2D computation.
• Renamed some variables for better clarity (e.g., m to pts)

HotellingEllipse 1.1.0

HotellingEllipse 1.1.0 is now on CRAN

• Fixed issue handling data.frame input in the ellipseParam and ellipseCoord functions (#2)
• Updates in the package documentation