compute average of arrays

[cctt126]

an 1D(1*20) array do while loop to produce 2D array(100*20),and add gaussian noise for each array. I want to compute the mean of the 2D array add gaussian noise,that is to say , count the mean of the 100 1D arrays. I have trouble in doing means ,the original 1D array data is in the attached vi.please help me ,thanks.

[altenbach]

OK, I don't quite understand your code. Should the output be a single number, the average of all 2000 points? Do you want the average of each row or column, forming another 1D array?

• SInce you know beforehand how many times the loop should run, use a FOR loop instead of a while loop.
• Autoindex at the output tunnel will automatically make a 20x100 array, no need for shift registers or feedback nodes.
• I have no idea why you are converting the output to as ASCII formated table. If you want ot calculate the average you might as well operate on the DBL array directly.

Since your question is not very clear, we can only guess what you actually want. The code in the image creates an array with 100 rows and each row consists of 20 elements: the original dataset with added noise. Then we take the average of all elements in the 2D array (sum all elements and divide by the number of elements). Most likely, you want a slightly different answer, so modify as needed or clarify your needs if you get stuck. 🙂

Message Edited by altenbach on 02-06-2007 10:05 PM

[cctt126]

thank you for your reply.

I am sorry for my unclear expression.

 I have an 1*20 array, like

A=[2.8600 2.8626 2.8653 2.8679 2.8705 …]

after add gaussian noise, the array become

A1=[2.8606 2.8604 2.8608 2.8662 2.8646…]

A2=[2.8603 2.8644 2.8637 2.8693 2.8698…]

A3=[2.8604 2.8654 2.8632 2.8678 2.8632…]

…

one hundred or more arrays. I want to calculate the mean of the array Ave=(A1+A2+…+A100)/100 .

I would like to test whether the difference between A and Ave will deduce with the average time raise.

please give me some more help.

thanks