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

convcirc (MathScript RT Module Function)

LabVIEW 2012 MathScript RT Module Help

Edition Date: June 2012

Part Number: 373123C-01

»View Product Info
Download Help (Windows Only)

Owning Class: filter implementation

Requires: MathScript RT Module


x = convcirc(a, b)

x = convcirc(a, b, n)

Legacy Name: cconv


Computes the circular convolution of two input vectors.




Name Description
a Specifies a real or complex input vector. If length(a) is greater than n, LabVIEW wraps a. If length(a) is less than n, LabVIEW pads the end of a with zeros.
b Specifies a real or complex input vector. If length(b) is greater than n, LabVIEW wraps b. If length(b) is less than n, LabVIEW pads the end of b with zeros.
n Specifies the size of the circular convolution. The default is length(a) + length(b) - 1.


Name Description
x Returns the circular convolution of a and b.


LabVIEW computes the circular convolution using the same algorithm as the default method in the Convolution VI. However, you can use the convcirc function to set the size of the convolution whereas the Convolution VI always returns the result with a length of length(a) + length(b) - 1.

The following table lists the support characteristics of this function.

Supported in the LabVIEW Run-Time Engine Yes
Supported on RT targets Yes
Suitable for bounded execution times on RT Not characterized


a1 = 0.1:0.1:0.4;
b1 = mirrorh(a1);
x1 = convcirc(a1,b1);

a2=[1-j, 2+2j, 3-3j, 4+4j];
b2=[5+0.5j, 4-0.4j, 3+3j, 2, 1];
x2 = convcirc(a2, b2, 4);

Related Topics



 Was this document helpful?  submit
  Helpful Not Helpful