Company Events Academic Community Support Solutions Products & Services Contact NI MyNI

freqsd (MathScript RT Module Function)

LabVIEW 2011 MathScript RT Module Help

Edition Date: June 2011

Part Number: 373123B-01

»View Product Info
Download Help (Windows Only)

Owning Class: filter design

Requires: MathScript RT Module


freqsd(b, a)

freqsd(b, a, n)

freqsd(b, a, w1)

h = freqsd(b, a)

h = freqsd(b, a, n)

h = freqsd(b, a, w1)

[h, w2] = freqsd(b, a)

[h, w2] = freqsd(b, a, n)

[h, w2] = freqsd(b, a, w1)

Legacy Name: freqs


Computes the s-domain Laplace transform frequency response. If you do not request an output, this function plots the magnitude and phase of the filter in the current plot window.



Name Description
b Specifies the numerator coefficients of the filter. b is a real or complex vector.
a Specifies the denominator coefficients of the filter. a is a real or complex vector.
n Specifies the number of frequency points. n is a positive integer. The default is 200.
w1 Specifies the frequency values. w1 is a vector.


Name Description
h Returns the complex frequency response.
w2 Returns the frequency values. w2 is a vector.


The following table lists the support characteristics of this function.

Supported in the LabVIEW Run-Time Engine Yes (if you request output)
Supported on RT targets Yes (if you request output)
Suitable for bounded execution times on RT Not characterized


[H, W] = freqsd([1 2 3], [2 1 3]);
loglog(W, abs(H))

Related Topics



Your Feedback! poor Poor  |  Excellent excellent   Yes No
 Document Quality? 
 Answered Your Question? 
Add Comments 1 2 3 4 5 submit