# unpack

Uncompress a list of block-diagonal symmetric matrices.

## Calling Sequence

    A=unpack(CA,blocksizes)

## Arguments

CA

  p-by-n real matrix of doubles, a compressed representation of `A`.

blocksizes

  b-by-1 real matrix of doubles, the sizes of the blocks.

A

  m-by-n real matrix of doubles, the entries of a list of block-diagonal symmetric matrices. n is the number of matrices stored into `A`.

## Description

This function is the reverse of the `pack` function. It uncompresses a list of symmetric block-diagonal matrices which have been compressed by `pack`.

## Examples

    // Define a compressed list of symmetric block-diagonal matrices.
    // There are 3 matrices in the list, as indicated by the 3 columns in CA.
    // Only the nonzero entries are stored in CA.
    // Only the upper part of the symmetric diagonal matrices are stored in CA.
    CA = [
    2,1,2;
    1,2,2;
    2,1,2;
    3,1,3;
    1,3,4;
    3,1,4
    ]
    // Each of the 3 block-diagonal matrices has 2 blocks.
    // Define the size of the two blocks:
    // the first block has size 2,
    // the second block has size 2.
    blocksizes=[2,2];
    // Unpack the matrices.
    A=unpack(CA,blocksizes)

## See Also

- pack