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Complex Mode Indicator Function (CMIF)

version 2.0.3 (1.44 MB) by Dr. Erol Kalkan, P.E.
This is a robust complex mode indicator function, which can be used to identify Eigen values. A simple example is provided.


Updated Thu, 24 Jan 2019 15:21:07 +0000

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CMIF is defined as the Eigen values solved from the normal matrix, which is formed from frequency response function (FRF) matrix. CMIF can be computed from multiplication of normal matrix with its Hermitian matrix or by singular value decomposition (SVD) of normal matrix at each spectral line.

This function computes CMIF using "economy size" SVD.

Bandpass filtering of input data is suggested before using CMIF. If you find this code useful for your application, please don't forget to rate it.

For questions, suggestions and comments:

Cite As

Dr. Erol Kalkan, P.E. (2022). Complex Mode Indicator Function (CMIF) (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2017b
Compatible with any release
Platform Compatibility
Windows macOS Linux

Inspired by: CMIF - Complex Mode Indicator Function

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