Working with arrays

[Eduardo.llcg]

Hello again J

Just a small question

I have 2D array with a lot of points (with more than 200 lines), where first column are X values and in the second column are Y values. I need to separate both columns, and I think this can be done with the function “Index Array”. After that, I need to calculate the difference between each numbers (Xi+1 – Xi) (Xi+2 – Xi+1) ; (Yi+1 – Yi) (Yi+2 – Yi+1) and so on in order to send each resultant value to an electrical motor. My question is, how can I calculate this with an array so big??

I can split small arrays and make the calculation separately, but this would make my program very heavy. I need something like a “For Loop” that after one calculation (Xi+1 – Xi) and (Yi+1 – Yi) send the values to the motor and then makes another calculation (Xi+2 – Xi+1) and (Yi+2 – Yi+1), and so on till file ends.

Hope you can find me a good solution, cos I need help 🙂

Best Regards

Eduardo Gonçalves

[Dennis_Knutson]

You posted to the instrument control board and you should have posted to the appropriate language board. I'm going to assume that you are using LabVIEW.

First, 200 lines is a pretty small array. Second, the 'like a for loop' you want to use is the for loop. A for loop will auto-index an input array and you can add a shift register/feedback loop to remember the last element. Show below is a basic example. You might aslo want to look at the resources for learning LabVIEW basics at http://www.ni.com/academic/lv_training/how_learn_lv.htm.

Message Edited by Dennis Knutson on 04-16-2008 08:29 AM

[Eduardo.llcg]

Many Thanks Dennis