pvinfo

Describe parameter vector specified with pvec

Syntax

[typ,k,nv] = pvinfo(pv)
[pmin,pmax,dpmin,dpmax] = pvinfo(pv,'par',j)
vj = pvinfo(pv,'par',j)
p = pvinfo(pv,'eval',c)

Description

pvinfo retrieves information about a vector p = (p₁, . . ., p_n) of real parameters declared with pvec and stored in pv. The command pvinfo(pv) displays the type of parameter vector ('box' or 'pol'), the number n of scalar parameters, and for the type 'pol', the number of vertices used to specify the parameter range.

For the type 'box':

[pmin,pmax,dpmin,dpmax] = pvinfo(pv,'par',j)

returns the bounds on the value and rate of variations of the j-th real parameter p_j. Specifically,

$p \min \leq p_{j} (t) \leq p \max, d p \min \leq \frac{d p_{j}}{d t} \leq d p \max$

For the type 'pol':

pvinfo(pv,'par',j)

returns the j-th vertex of the polytope of Rⁿ in which p ranges, while

pvinfo(pv,'eval',c)

returns the value of the parameter vector p given its barycentric coordinates c with respect to the polytope vertices (V₁, . . .,V_k). The vector c must be of length k and have nonnegative entries. The corresponding value of p is then given by

$p = \frac{\sum_{i = 1}^{k} c_{i} V_{i}}{\sum_{i = 1}^{k} c_{i}}$

Version History

Introduced before R2006a

pvinfo

Syntax

Description

Version History

See Also