Signal Processing Toolbox

Working with Data

The examples in the preceding sections obtain data in one of two ways:

• By direct input, that is, entering the data manually at the keyboard
• By using a MATLAB or toolbox function, such as sin, cos, sawtooth, square, or sinc

Some applications, however, may need to import data from outside MATLAB. Depending on your data format, you can do this in the following ways:

• Load data from an ASCII file or MAT-file with the MATLAB load command.
• Read the data into MATLAB with a low-level file I/O function, such as fopen, fread, and fscanf.
• Develop a MEX-file to read the data.

Other resources are also useful, such as a high-level language program (in Fortran or C, for example) that converts your data into MAT-file format - see the MATLAB External Interfaces/API Reference documentation for details. MATLAB reads such files using the load command.

Similar techniques are available for exporting data generated within MATLAB. See the MATLAB documentation for more details on importing and exporting data.

Note    All Signal Processing Toolbox functions accept double-precision inputs. The Filter Design Toolbox, along with the Fixed-Point Toolbox, enables single-precision floating-point and fixed-point support for most dfilt structures.

The Dirichlet Function

Filter Implementation and Analysis

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