NEWS.md

In inflection: Finds the Inflection Point of a Curve

What’s new in version 1.3.6

1. Fix minor issue of item values at help files for OS "-linux-x86_64-debian-clang", "r-devel-linux-x86_64-debian-gcc"

What’s new in version 1.3.5

New functions added for knee point estimation

• check_curve() checks a curve for its convexity type
• uik() finds the UIK estimation for elbow or knee point of a curve
• d2uik() performs UIK method on the approximation of second order derivatives

The Unit Invariant Knee (UIK) estimator is described in article:

• Demetris T. Christopoulos (2016). Introducing Unit Invariant Knee (UIK) As an Objective Choice for Elbow Point in Multivariate Data Analysis Techniques. Available at SSRN: http://dx.doi.org/10.2139/ssrn.3043076

Vignettes added for the package

Install the inflection package and then read vignettes:

• vignette('inflection', package ='inflection') an introductory vignette
• vignette('inflectionDevelopingMethods', package ='inflection') reproduction of results for article:
  • Demetris T. Christopoulos (2014). Developing methods for identifying the inflection point of a convex/concave curve. arXiv:1206.5478v2 [math.NA]. https://arxiv.org/pdf/1206.5478v2.pdf
• vignette('inflectionMissionImpossible', package ='inflection') a vignette for ‘impossible’ missions

Minor changes

Remove the option to plot in two separate pdfs ‘ese_iterations.pdf’, ‘ede_iterations.pdf’ from findipiterplot() and open new plot windows instead of saving files.

What’s new in version 1.3

Use of parallel computing under request (doparallel=TRUE) for the functions:

• ese()

• bese()

• findiplist()

• findipiterplot()

Repair of function findipiterplot()

1. Fix bugs in calling the function
2. Remove indirect methods CRESE, CREDE due to their limited functionality
3. Plot in two separate pdfs ‘ese_iterations.pdf’ and ‘ede_iterations.pdf’
4. Check for the existence of sufficient number of results before creating confidence intervals

What’s new in version 1.2

1. The function eixf(x, y, f, i) was removed as not essentially necessary

2. New functions with self declaring names were added:

3. ese(x,y,index)

4. bese(x,y,index)
5. ede(x,y,index)
6. edeci(x,y,index)

7. bede(x,y,index) All functions require length(x)>=4 in order to create numeric output

8. The function findipiterplot(x,y,index) was improved and became findipiterplot(x, y, index, plots = TRUE, crossrun = FALSE, ci = FALSE)

9. Changes in NAMESPACE
10. Reference to new paper:

Demetris T. Christopoulos (2016). On the efficient identification of an inflection point.International Journal of Mathematics and Scientific Computing, (ISSN: 2231-5330), vol. 6(1). https://veltech.edu.in/wp-content/uploads/2016/04/Paper-04-2016.pdf

inflection documentation built on June 15, 2022, 5:07 p.m.