Can I do the equivalent of a register to offset with a start value of variable?

I have an array of samping frequency values (determined by an external signal) and I would like to extract a value both of this table to use as the frequency of sampling for another signal.

The shift register is almost what I want. The problem is that I still won't start at element 0, but rather to the first value of positive sampling frequency, which has a slightly different every time. Once this value is reached, I want the index to increment by 1 on each iteration of the loop (which already does).

I have attached a VI for reference. Any suggestions?

The structure of the case is inside the while loop.  It's a bit like the structure used for the State machines.  Look at the VI attached. I didn't test it.

In general, you should avoid buiding an array within a loop as it will eventually cause memory allocation problems (= program crash!).  It is best to allocate an array as important or more than the maximum that you expect to use outside the loop and replace a subset of table inside the loop.

Lynn

Tags: NI Software

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