IQClab comprises various auxiliary functions. The following table provides an overview with links to the detailed descriptions.
| Function | Description | Link |
| fAugss | Augment state space realizations | Details |
| fBasis | Generate basis functions for IQC-multipliers | Details |
| fBodePZ | Bode plot with pole-zero indication | Details |
| fBodeMagPZ | Bode magnitude plot with pole-zero indication | Details |
| fBoundvar | Impose bound on matrix variable | Details |
| fCleanupsys | Clean-up a state space realization | Details |
| fCoprime | Perform a coprime factorization and get Bezout identity | Details |
| fCutfig | Cut away white spaces in a figure | Details |
| fEigfac | Factorize symmetric matrix into spectral  form | Details |
| fHe | Generate symmetric matrix  | Details |
| fHinfbalreal | Compute  -balanced realization | Details |
| fIntkerext | Compute orthonormal bases of two matrices  and  | Details |
| fInv | Compute inverses of matrices, while exploiting properties | Details |
| fInvproj | Perform inverse projection (Projection Lemma) | Details |
| fJ | Generate matrices | Details |
| fJfac | Factorize symmetric matrix into spectral form | Details |
| fJt | Generate matrices | Details |
| fKron | Compute Kronecker products with uncertain matrices | Details |
| fLFTdata | Extract data from an LFT and automatically create uncertainty block with iqcdelta for quickly setting up an IQC-analysis | Details |
| fLyapext | Extend Lyapunov matrices in different fashions | Details |
| fMultiplext | Extend full-block multiplier matrices in different fashions | Details |
| Fmultss | Multiply two state-space realizations | Details |
| fOblkdiag | Create block off-diagonal matrices | Details |
| fPlantex | Extend plant for IQC analysis and pad with identity/zero blocks | Details |
| fQ | Compute  given and | Details |
| fRP | Compute robust performance margin using mssv | Details |
| fRS | Compute robust stability margin using mssv | Details |
| fSchur | Compute Schur complement of block structured matrix | Details |
| fSquare | Factorize IQC-multipliers to have square, stable outer-factors | Details |
| fss2m | Create LMI outer-factors from state space objects | Details |
| fsskron | Compute  for  | Details |
| fT | Create permutation matrices | Details |
| fTriang | Create triangular matrices | Details |
| fVec | Vectorize a matrix in different fashions | Details |
| fW | Generate weighting function for covering | Details |