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## Modal Assurance Criterion (MAC)

version 1.0.0.0 (2.1 KB) by
This function is to compute the Modal Assurance Criterion (MAC) between mode shapes

Updated 23 Sep 2015

This function is to compute and plot Modal Assurance Criterion (MAC) matrix between identified mode shapes.

### Cite As

Mohammad Farshchin (2020). Modal Assurance Criterion (MAC) (https://www.mathworks.com/matlabcentral/fileexchange/53173-modal-assurance-criterion-mac), MATLAB Central File Exchange. Retrieved .

A copy of this code is available on Github @: https://github.com/mfarshchin/Modal-Assurance-Criterion-MAC
Please feel free to copy, modify or contribute.

The MAC equation mAc= (abs(Phi1'*Phi2))^2/((Phi1'*Phi1)*(Phi2'*Phi2))

mAc= (abs(Phi1.'*conj(Phi2)))^2/((Phi1.'*conj(Phi1))*(Phi2.'*conj(Phi2)))

MatLAB transpose of a complex-valued array is not only a transpose but also complex conjugate. What I meant is Phi1' is actually not only transpose of Phi1 but also its complex conjugate.

tuan tran

It looks good.
How can we calculate crossMAC?

godfreap

There is basically no instruction to go along with this, so good luck figuring out what to do and what goes where. There's one example, but so deconstructed and without context that it does not matter. If the author is still active, I highly recommend he add some sort of tutorial - or at least a proper explanation - to this file so that people who want to use it know what they are doing.

Da Cao

fantastic

mati ullah

How can we calculate MAC between damaged and undamaged structures mode shapes?

Wentao Zhao

Unzip all files to the same folder then run the code.

Gaia C

It doesn't work, the error is:
"Not enough input arguments.

Error in MAC (line 11)
for I=1:size(phi,2)"

Can you help me?

Bo Miao

Michal Golebiewski

Arun Sharma

How to get the modal shape matrix in Abaqus?

There is a mat file in the zip file you download. This file contains the data.

Arun Sharma

Can someone provide a demo data as an example to learn and implement it?
Contact id: arunme65@gmail.com

Jasper Walden

smita kaloni

Make sure that you save MAC.m and ModeShapes.mat in the same folder and set that folder as MATLAB working directory or add a path to it. Then: load ModeShapes.mat;MAC_Matrix=MAC(phi)

it doesnot work, can u help me?

Nima Nazemi

Shima

Very Useful.

Jiawei Liu

Convenient. Thanks.

qiong zou

Fabricio Ortiz

Thank's a lot!
It was very usefull during in course os structural dynamics.