LabVIEW
Equality check on strings containing value and unit
I write the input array to my oscilloscope via visa.
I want to check if my send values are set by reading them back and a following comparison one by one.
What is your simplest approach to check equality on those 2 string arrays. Of course 1V and 1.00V should be treated as equals.
Attached as LV19
Hi Quiztus,
@Quiztus2 wrote:
I want to check if my send values are set by reading them back and a following comparison one by one.
What is your simplest approach to check equality on those 2 string arrays. Of course 1V and 1.00V should be treated as equals.
Compare the numeric and the string/unit parts on their own…
- Can the scope answer with 100mV when you send 0.1V?
- You know about the problems of comparing float values? (What is the expected result for a value of 1.1V that cannot be represented precisely using floats?)
Very valid points. Fortunately setting is either from a discrete set of interger + string e.g. (AC|10K|100K|1M|100mV)
or plain integer.
The responses are supposed to be integer based, but they are sometimes floats instead.
So the best so far I came up with is:
Since you know the formatting rules of the instrument, can't you just create a string from the value you send, then compare it with the returned string?
