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LibreOffice Calc is the spreadsheet component of the LibreOffice software package. After forking from OpenOffice.org in 2010, LibreOffice Calc underwent a massive re-work of external reference handling to fix a large number of defects in formula calculations involving external references, and to boost data caching performance especially when referencing large data ranges. Additionally Calc now supports 1 million rows in a spreadsheet with macro references to each cell. Calc is capable of opening and saving most spreadsheets in Microsoft Excel file format.〔 Calc is also capable of saving spreadsheets as PDF files.〔 As with the entire LibreOffice suite, Calc is available for a variety of platforms, including Linux, OS X, Microsoft Windows,〔 and FreeBSD.〔 Available under the GNU Lesser General Public License, Calc is free and open source software.〔 ==Features== Capabilities of Calc include: * Ability to read/write OpenDocument (ODF), Excel (XLS), CSV and several other formats. * Support for a large number of functions, including those for imaginary numbers, as well as financial and statistical functions. * Supports 1 million rows in a spreadsheet, making LibreOffice spreadsheets more suitable for heavier scientific or financial spreadsheets.〔 However, the number of columns is restricted to at most 1024, much lower than Excel's limit of 16384.〔(Bug 50916 - Allow more than 1024 columns in calc )〕 In its internal data structure, Calc until version 4.1 relies on cells as the base class throughout, which has been blamed for "extreme memory use, slow computation, and difficult code". Version 4.2 (released in January 2014) addresses these issues by instead storing the data in arrays where possible.〔Jonathan Corbet: (A LibreOffice update ). LWN.net, October 23, 2013〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「LibreOffice Calc」の詳細全文を読む スポンサード リンク
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