In this version:

Fixed issue #3

Improved functions description.

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 serves to select 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), they 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`

)

This version includes the following modifications:

Correction of an error that occurred in the

`ellipseParam`

and`ellipseCoord`

functions, when data is data.frame, instead of tibbleImprovement of the package documentation

Changes in the vignette (the difference between

`ellipseParam`

and`ellipseCoord`

functions to draw Hotelling’s ellipse is much clearer for users).

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Initial release