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# ST_MATMODE_SHELL

The coefficient matrix of the linear system, \(A-\sigma B\), is not built explicitly, and instead it is handled implicitly via a `MATSHELL`.

## Note

This mode severely restricts the number of possibilities available for solving the linear system via `KSP`.

## See Also

ST: Spectral Transformation, `STMatMode`, `STSetMatMode()`, `ST_MATMODE_COPY`, `ST_MATMODE_INPLACE`

## Level

intermediate

## Location

include/slepcst.h

Index of all ST routines Table of Contents for all manual pages Index of all manual pages