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Disk-based phase variation corresponding to disk-based gain variation

returns
the disk-based phase variation corresponding to disk-based gain variation
`DPM`

= getDPM(`DGM`

)`DGM`

. In the model used by `umargin`

, gain and
phase variation are represented as a multiplicative factor
*F*(*s*) taking values in a disk centered on the real
axis. The disk described by its real-axis intercepts `DGM`

=
`[gmin,gmax]`

, which represent the relative amount of gain variation
around the nominal value *F* = 1. Because the disk is complex-valued, the
disk described by `DGM`

also represents a certain amount of phase
variation, `DPM`

. For more information, see `getDGM`

.

`diskmargin`

| `diskmarginplot`

| `getDGM`

| `umargin`

| `wcdiskmargin`