Will provide a list of identity matrices for the specified modes.

1 | ```
start_ident(p, modes = NULL)
``` |

`p` |
A vector of integers. This is the dimension of the array and the length of the list to be created. |

`modes` |
A vector of integers. These are the indices in the list to be given an identity matrix. |

Given a vector of dimensions `p`

and a vector indicating which
modes will get an identity matrix `modes`

, this function will
return a list `start_vals`

where `start_vals[[i]]`

is the
identity matrix of dimensions `p[i]`

if `i`

is in
`modes`

and will be `NULL`

otherwise.

This is primarily used when getting starting values in `equi_mcmc`

.

`start_vals`

A list of identity matrices and NULL values.

David Gerard.

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