isdouble

Determine if digital filter coefficients are double precision

Syntax

flag =
isdouble(d)

Description

example

flag = isdouble(d) returns true if the coefficients of a digital filter, d, are double precision.

Examples

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Double- and Single-Precision Filter

Open Live Script

Use designfilt to design a sixth-order highpass IIR filter. Specify a normalized passband frequency of $0.6 π$ rad/sample. Convert it to a single-precision filter. Identify the precision in each case.

fd = designfilt('highpassiir','FilterOrder',6,'PassbandFrequency',0.6);
isd = isdouble(fd)

isd = logical
   1

fs = single(fd);
iss = isdouble(fs)

iss = logical
   0

Input Arguments

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`d` — Digital filter
`digitalFilter` object

Digital filter, specified as a digitalFilter object. Use designfilt to generate d. If you want a single-precision filter, apply single to the output of designfilt.

Example: d = designfilt('lowpassiir','FilterOrder',3,'HalfPowerFrequency',0.5) specifies a third-order Butterworth filter with normalized 3-dB frequency 0.5π rad/sample.