Based on the provided specification, I'll write a complete R function that transforms a tdm matrix into a new matrix with an additional column representing the class of each term.

Why is my dataframe from an Excel file imported like that?

Grouping and Collapsing Text in a Data Frame: A Comparative Analysis of R Packages

Understanding Dimensionality Reduction in R: A Deep Dive into Cosine Similarity and Multi-Dimensional Scaling (MDS) - A Comprehensive Guide

Adding Color to Points on a Map to Denote Values of Another Variable: A Practical Guide for R Users

Plotting Date Data with Missing Weeks in ggplot

Implementing Ensemble Methods in R: A Deep Dive into C4.5 with Bagging CART, Boosted C5.0, and Random Forest

Hash to String Conversion Using Custom Character Sets with Modular Arithmetic

Understanding and Resolving Matrix Multiplication Errors in RcppArmadillo on Windows Platforms

Understanding and Solving the Problem: Iterating List of Strings to Get Words Count