This is due to rounding and truncating differences. If you do not have the Filter Design Toolbox installed, selecting any data type other than double-precision floating point results in a filter that does not exactly match the one you designed in the FDATool. Select Export Suggested to use the suggested data type or select Export As and select the desired data type from the pull-down.Variable names cannot be C language reserved words, such as "for." * length variables contain the total number of coefficients of that type. Numerator, Numerator length*, and Number of sections (inactive if filter has only one section) Lattice coeffs, Lattice coeffs length*, and Number of sections (inactive if filter has only one section) Lattice coeffs, Lattice coeffs length*, Ladder coeffs, Ladder coeffs length*, Number of sections (inactive if filter has only one section) Numerator, Numerator length*, Denominator, Denominator length*, and Number of sections (inactive if filter has only one section) The particular filter structure determines the variables that are created in the file Enter the variable names to be used in the C header file. The Export to C Header File dialog box appears. Select Export to C Header File from the File menu.To create a C header file with variables that contain filter parameter data, follow this procedure: You may want to include filter information in an external C program. Filter Design and Analysis Tool (Signal Processing Toolbox) Signal Processing Toolbox
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