While using the function rpmordermap, the order resolution specified in the argument of the function does not match the actual order resolution.

I am using the function rpmordermap as follows:

[map,order,rpm,time,res] = rpmordermap(Ia,Fs,rpm,0.05,"Scale","dB","Window","hann");

In the argument of the function, the order resolution is set to 0.05. This does not match the values in the 'order' column as they are:

I can't find the reason why the distance between these values is not equal to the specified order resolution of 0.05.

Any help on this problem is greatly appreciated!

Answer 1

[Ayush Modi]

Hi Olivier,

As per my understanding, you would like to understand why the distance between the values in Order attribute is not equal to the specified order resolution (res) i.e. 0.05. Upon reviewing the "rpmordermap" function's MathWorks documentation, I found the following description in the input argument "res":

"The actual order resolution may differ slightly from the specified value."

Please refer to the following MathWorks documentation for more information on how the actual order is determined:

https://www.mathworks.com/help/signal/ref/rpmordermap.html#buz2r0k:~:text=as%20a%20scalar.-,Algorithms,-Order%20analysis%20is

Hope this helps!