> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/e3d-training-manual/analysis/specifiying-and-performing-the/analysis-options/precision-of-floating-point-ar.md). # Precision of Floating Point Arithmetic in Solver How to choose among the double precision, sparse, and quad precision solvers for analysis accuracy and speed. The option to select the precision of floating point arithmetic is located in the *Analysis Options* dialog, which can be opened by clicking **Analysis > Analysis Options**. **Double precision solver:** * standard solver similar to many analysis programs in the market * enough for most structures **Double precision Sparse solver:** * fastest, but lacks informative messages when something goes wrong during a solution * can only be used for static analysis * useful to solve extremely large structural models * uses an out-of-core approach to minimize the requirement of computer memory **Quad precision Skyline solver:** * provides an invaluable alternative for some large or numerically sensitive models where the 64-bit floating point (double precision) solver may fail * extremely stable and accurate, but relatively slow * the recommended solver if the model contains rigid diaphragms to avoid numerical difficulties. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.enercalc.com/e3d-training-manual/analysis/specifiying-and-performing-the/analysis-options/precision-of-floating-point-ar.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.