josdejong/mathjs

implement inverse erf function

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#2,011 opened on Oct 28, 2020

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 (3 comments) (1 reaction) (0 assignees)JavaScript (1,314 forks)batch import
featurehelp wanted

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Description

Thanks for the implementation of erf function here #678 . because of this I'm able to write gaussian distribution function as follows (1 - erf((m - x ) / (Math.sqrt(2) * sd))) / 2

It is good to have an inverse erf function so something like this image quantile function of gaussian distribution can be implemented.

Contributor guide

Research direction
Study the existing erf implementation in the codebase and then implement the inverse erf function using numerical methods such as Newton's method or series expansion. Ensure to add tests and documentation.
Tech stack
javascript
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaScriptGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65