# gridureal

Grid `ureal`

parameters uniformly over their range

## Syntax

`B = gridureal(A,N)`

[B,SampleValues] = gridureal(A,N)

[B,SampleValues] = gridureal(A,NAMES,N)

[B,SampleValues] = gridureal(A,NAMES1,N1,NAMES2,N2,...)

## Description

`B = gridureal(A,N)`

substitutes `N`

uniformly-spaced samples of the uncertain real parameters in `A`

. The samples are chosen to cut “diagonally” across the cube of real parameter uncertainty space. The array `B`

has size equal to `[size(A) N]`

. For example, suppose `A`

has 3 uncertain real parameters, say `X`

, `Y`

and `Z`

. Let (`x1, x2 , , and xN`

) denote `N`

uniform samples of `X`

across its range. Similar for `Y`

and `Z`

. Then sample `A`

at the points `(x1, y1, z1)`

, `(x2, y2, z2)`

, and `(xN, yN, zN)`

to obtain the result `B`

.

If `A`

depends on additional uncertain objects, then `B`

will be an uncertain object.

`[B,SampleValues] = gridureal(A,N)`

additionally returns the specific sampled values (as a `structure`

whose fieldnames are the names of `A'`

s uncertain elements) of the uncertain reals. Hence, `B`

is the same as `usubs(A,SampleValues)`

.

`[B,SampleValues] = gridureal(A,NAMES,N)`

samples only the uncertain reals listed in the `NAMES`

variable (`cell`

, or `char`

array). Any entries of `NAMES`

that are not elements of `A`

are simply ignored. Note that `gridureal(A, fieldnames(A.Uncertainty),N)`

is the same as `gridureal(A,N)`

.

`[B,SampleValues] = gridureal(A,NAMES1,N1,NAMES2,N2,...)`

takes `N1`

samples of the uncertain real parameters listed in `NAMES1`

, and `N2`

samples of the uncertain real parameters listed in `NAMES2`

and so on. `size(B)`

will equal `[size(A) N1 N2 ...]`

.

## Examples

## Version History

**Introduced before R2006a**