array subset output malfunction

[Ray.R]

I ran your code and attempted concatenating all the data within a single array for each of the magnitude, phase and coherence.

The above graphs show the concatenated results, wheras the bottom shows your original results.

I know I'm rusty in this area, but neither look correct.  What should be the correct output?  What are you expecting?

[northwood]

Thanks Ray!

If I am thinking about this right, concatenation is where the array is added from one end to the other.  So for concatenation the array AB(length 2)+CD(Length 2)=ABCD (Length 4)?  Whereas I need an ensemble of the data, Array (AB+CD)/2=AD (Length 2) Where each point in AB and CD is added then divided by 2. 

The magnitudes are the same, when scaled correctly.  I am trying to get the same as the Bode plot for the SS Matrice in the first .vi or matalb.  Coherence of the concatenation looks pretty good. 

[Ray.R]

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@northwood wrote:

Thanks Ray!

If I am thinking about this right, concatenation is where the array is added from one end to the other.  So for concatenation the array AB(length 2)+CD(Length 2)=ABCD (Length 4)?  . 

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Yes

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@northwood wrote:

Whereas I need an ensemble of the data, Array (AB+CD)/2=AD (Length 2) Where each point in AB and CD is added then divided by 2. 

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Well...  there are 10 iterations..  So it would become ABCDEFGHIJKLMNOPQRST, so do you still divide by 2?  😉

Or do you mean: (AB+CD+EF+GH+IJ+KL+MN+OP+QR+ST)/10  ?

Are we looking at an average of each iteration?  You lost me..

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@northwood wrote:

The magnitudes are the same, when scaled correctly.  I am trying to get the same as the Bode plot for the SS Matrice in the first .vi or matalb.  Coherence of the concatenation looks pretty good. 

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So you mean the plots I provided actually looked like what you were looking for?  If so, I can post the code change for you.

[northwood]

@northwood wrote:

Whereas I need an ensemble of the data, Array (AB+CD)/2=AD (Length 2) Where each point in AB and CD is added then divided by 2. 

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Well...  there are 10 iterations..  So it would become ABCDEFGHIJKLMNOPQRST, so do you still divide by 2?  😉

Or do you mean: (AB+CD+EF+GH+IJ+KL+MN+OP+QR+ST)/10  ?

Are we looking at an average of each iteration?  You lost me..

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Each array should be added to the next and divided by the total number of arrays.  So like matlab code AB(1)+CD(1)+...../10 then AB(2)+CD(2)..../10 etc etc.  Until you have an array the same size as the original AB but the average across all iterations.  See ensemble average here:  http://www.numberwatch.co.uk/averages.htm

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The Bode Plots still aren't as clear as I would like.  The upper (100rad/s+) frequencies just won't come out very clear, I think it has something to do with my Signal generator and step size.  You guys have helped tons though I really appreciate it.  How did you make the coherence and stuff so clear?  I am not sure how you did it. 

Thanks!

[Ray.R]

See the attached VI, which is your version with a slight modification.

I did not cleanup the code.  It is in LV 2010.

[northwood]

Thank You!

[Ray.R]

Did that work for you?