ndims

Query number of dimensions of dynamic system model or model array

Syntax

n = ndims(sys)


Description

n = ndims(sys) is the number of dimensions of a dynamic system model or a model array sys. A single model has two dimensions (one for outputs, and one for inputs). A model array has 2 + p dimensions, where p ≥ 2 is the number of array dimensions. For example, a 2-by-3-by-4 array of models has 2 + 3 = 5 dimensions.

ndims(sys) = length(size(sys))

Examples

Determine Dimensions of Model Array

Create a 3-by-1 array of random state-space models, each with 4 states, 1 input, and 1 output.

sys = rss(4,1,1,3);

Compute the number of dimensions of the model array.

ndims(sys)

ans = 4

The number of dimensions is 2+p, where p is the number of array dimensions. In this example, p is 2 because sys is 3-by-1.