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Open-loop transfer function at specified point using `slLinearizer` or `slTuner` interface

`sys = getLoopTransfer(s,pt,temp_opening)`example`sys = getLoopTransfer(s,pt,temp_opening,sign)`

`sys = getLoopTransfer(___,mdl_index)`example

` sys = getLoopTransfer(s,pt)` returns
the point-to-point
open-loop transfer function at the specified analysis point
for the model associated with the

The software enforces all the permanent loop openings specified
for `s` when it calculates `sys`.
If you configured either `s.Parameters`, or `s.OperatingPoints`,
or both, `getLoopTransfer` performs multiple linearizations
and returns an array of loop transfer functions.

` sys = getLoopTransfer(s,pt,sign)` specifies
the feedback sign for computing the open-loop response. By default,

Set `sign` to `-1` to compute
the negative-feedback open-loop transfer function for applications
that assume the negative-feedback definition of `sys`.
Many classical design and analysis techniques, such as the Nyquist
or root locus design techniques, use the negative-feedback convention.

The closed-loop sensitivity at `pt` is equal
to `feedback(1,sys,sign)`.

` sys = getLoopTransfer(s,pt,temp_opening)` considers
additional, temporary, openings at the point specified by

` sys = getLoopTransfer(s,pt,temp_opening,sign)` specifies
temporary openings and the feedback sign.

` sys = getLoopTransfer(___,mdl_index)` returns
a subset of the batch linearization results.

Use this syntax for efficient linearization, when you want to obtain the loop transfer function for only a subset of the batch linearization results.

`addOpening` | `addPoint` | `getCompSensitivity` | `getIOTransfer` | `getSensitivity` | `slLinearizer` | `slTuner`

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