Code for IPA algorithm

- R code for Shiny App for IPA algorithm - algorithm described in the paper: Nams, Vilis O, and Hayward, Matt W (submitted) A method to predict overall food preferences. - algorithm by Vilis O Nams and coding by Shaun Garnett - this code covers the basic IPA method - it does not include bootstrapping本代码为面向IPA算法（IPA）的Shiny应用程序（Shiny App）的R代码。该算法刊载于论文：Nams、Vilis O与Hayward、Matt W（已投稿）《一种预测整体食物偏好的方法》。算法由Vilis O Nams提出，代码由Shaun Garnett编写。本代码仅涵盖基础IPA方法，未包含自举法（Bootstrap）流程。