Using the for loop iteration number as variable outside loop

[exobc]

I've very little experience with labview, and trying to design a program which generate a signal inside a for loop and each iteration the frequency of the signal is increased, basically I need to be able to use the for loop iteration number (i.e whether it's iteration 1, 2, 3 etc.) to multiply with a step size to add to the initial start frequency. I've tried shift registers etc. but can't seem to get it too work, any help would be greatly appreciated.

[Bob_Schor]

Do you see the little "index" terminal, blue square with "i" inside it on the lower left?  This is the For loop index, starts at 0 and increments by 1 for every loop.  Just wire it ...  This generates an array of even numbers, 0 .. 18.

Bob Schor

[Norbert_B]

I think that code (or very similar) is already placed in at least a dozen of posts, so only a screenshot:

Norbert

[Dennis_Knutson]

Consider the Ramp Pattern function to create an array of frequencies that you need and just write the array into a for loop.

[exobc]

Thanks for both replies, Norbert your solution was perfect, I had the logic located outside the loop and was getting different kinds of errors etc. but it's working perfect now thanks again.

[crossrulz]

There is also the simple Ramp Pattern VI that you could use to generate your points of interest.

[exobc]

I'll have a look at this and try implement it, thanks 

[exobc]

One final question, I've searched the forums but can't seem to find an answer for a for loop, for testing I'm viewing the generated signal on an oscilliscope, but the loops execute far too quicky to see it, is there any way to hold a loop for a desired amount of time before beginning the next iteration. I've found lots of solutions for while loops.

[RavensFan]

Put a wait function inside of the For Loop.

[Dennis_Knutson]

Why would the solution for a for loop be any different than a while loop?