isdouble

Determine if digital filter coefficients are double precision

Syntax

flag = isdouble(d)

Description

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

Examples

Double- and Single-Precision Filter

Use designfilt to design a sixth-order highpass IIR filter. Specify a normalized passband frequency of $$0.6\pi$$ 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

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.

Output Arguments

flag — Type identification

logical scalar

Type identification, returned as a logical scalar.