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# Some Functions and Methods for QSAS dataobjects

In the following we list some commonly used functions and methods for QSAS data objects. The QSAS data object module QDOS contains many more (e.g. mathematical operators for all numerical objects.) Use the QDOS HTML documentation to find out about these. As well as intrinsic QDOS methods there are utility functions which are defined in `QsasUtils.h` [marked (A)] and `QdUtils.h` [marked (U)].

Subsections

- Plug-in Interface
- General Methods
- Time Series Handling
- Subsetting Data Series
- Creating Sequence Masks
- Using Sequence Masks
- Time Object Handling
- Time Interval Handling
- Matrix and Matrix Sequence handling
  - Dimensions
  - Matrix Class
  - Matrix Sequences
- Utilities for Handling Cartesian and Polar Vectors
- Joining Time Series Data