# svdDemo

From matlib v0.9.2
by Michael Friendly

##### Demonstrate the SVD for a 3 x 3 matrix

This function draws an `rgl`

scene consisting of a representation of the identity matrix and a
3 x 3 matrix `A`

, together with the corresponding representation of the
matrices U, D, and V in the SVD decomposition,
A = U D V'.

##### Usage

```
svdDemo(A, shape = c("cube", "sphere"), alpha = 0.7,
col = rainbow(6))
```

##### Arguments

- A
A 3 x 3 numeric matrix

- shape
Basic shape used to represent the identity matrix:

`"cube"`

or`"sphere"`

- alpha
transparency value used to draw the shape

- col
Vector of 6 colors for the faces of the basic cube

##### Value

Nothing

##### Examples

```
# NOT RUN {
A <- matrix(c(1,2,0.1, 0.1,1,0.1, 0.1,0.1,0.5), 3,3)
svdDemo(A)
# }
# NOT RUN {
B <- matrix(c( 1, 0, 1, 0, 2, 0, 1, 0, 2), 3, 3)
svdDemo(B)
# a positive, semi-definite matrix with eigenvalues 12, 6, 0
C <- matrix(c(7, 4, 1, 4, 4, 4, 1, 4, 7), 3, 3)
svdDemo(C)
# }
# NOT RUN {
# }
```

*Documentation reproduced from package matlib, version 0.9.2, License: GPL (>= 2)*

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