DSP Blockset    

Exporting a Filter from FDATool.   Place a Digital Filter Design block or the Filter Realization Wizard from the Filter Designs library in a model. Double-click the block to open FDATool. You can export a filter you designed in FDATool to the MATLAB workspace, MAT-file, or text file as follows:

    1. Click the File menu and select Export Filter....

    2. Set the parameters in the Export dialog. You can export to the MATLAB workspace, to a MAT-file, or to a text file. To use the filter in another filter block, export to the workspace or to a MAT-file, which requires you to type in the names of the variables in which to store the filter coefficients.
    3. Click OK to export the filter. Now you can use the variables in other filter blocks and applications.

  Importing a Filter to FDATool Filter Analysis and Design with Other MathWorks Products