Regarding neighborhood comparisons in two arrays

[johndoe3344]

I was wondering whether there was any efficient way to do that.

Let's say I have two text files that are 1d arrays:

Array1:                  Array2:

0                               0

0                               0

0                               0

0                              100

100                            0

0                              100

0                                0

100                            0

0                                0

Basically I want something that goes through each value of array1, and if it sees a number above a certain threshold (in this case, the 100), it checks the corresponding entry n in array2, as well as n-1 and n+1. If there are numbers above a threshold in either n-1, n, or n+1, then add one to a counter variable. Otherwise do nothing.

So in my two arrays, there should be 1 count. Array1 and array2 will always have the same number of rows.

Something like this would be trivial with Java or Matlab using a for loop, but I'm not sure how to do it with LabVIEW. I can handle the if's, but I'm not sure how to represent "n-1" or "n+1".

[Dennis_Knutson · Accepted solution]

LabVIEW has for loops too.

Message Edited by Dennis Knutson on 01-29-2010 07:56 PM

[smercurio_fc]

And now for the requisite message:

To learn more about LabVIEW it is recommended that you go through the tutorial(s) and look over the material in the NI Developer Zone's Learning Center which provides links to other materials and other tutorials. You can also take the online courses for free.

[johndoe3344]

Thanks a lot. Is there a chance you could post the actual VI? I can't find some of the functions.

[Dennis_Knutson]

Left to right:

Decimal String to Number

Greater Than

For Loop

Case Statement

Decrement

Index Array

Increment

Compound Arithmetic

Select

The for loop has a shift register and the data is wired straight through in the false case.

Take the tutorials mentioned above.