Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms.... formula Gets or sets the formula in A1-style. r1c1_formula...r1c1_formula Gets or sets the formula in R1C1-style. chart_data_worksheet...