Table 1

${\mathbf{I}}_r^{\ast }$, ${\mathbf{A}}_r^{\ast }$

$n\times s_r$

${\mathbf{F}}_r^{\ast }$

$k_r\times s_r$

${\mathbf{f}}_r$, ${\mathit{\pi }}_r$

$k_r\times 1$

${\mathbf{y}}_r$, ${\mathbf{x}}_r$

n × 1

${\mathbf{x}}_r^{\ast }$

$s_r\times 1$.