Labview : 1D array sorting after removing minus numbers and duplicates

Question

I have one number array like below picture.

I'd like to remove whole minus numbers and duplicate numbers, and sort the array in ascending order, like below.

How could I do that?

Answer 1

This does the job :

• Sort the array
• Find 0 and cut the array
• Substract rotated array to find doubles (=0)
• remove doubles

Answer 2

Unless there was a real efficiency need, I'd shoot for simplicity and readability:

1. Sort the array
2. Feed it into a for loop with a conditional concatenation terminal
   1. Use a feedback node to get the last value
   2. If this value is >0 and != to the last value, send true to the concatenation terminal.

You could always AND the >0 and != tests together and wire that directly to the concatenation terminal.

The output array from the for loop will be what you're looking for.

Answer 3

I like Vivien's use of Threshold 1D Array and Array Subset to remove the negative values, but the rotate and subtract before removing zeroes seems unnecessarily complex. Here's a solution with a For loop, shift register and conditional indexing:

Note that we have to initialise the shift register with something, or it would remember data from the previous run, giving unwanted behaviour (the same would be true of a feedback node) - so we make sure that the first array element will always be included by ensuring that the initialisation value is not equal to the first element.