if statement implementation

[baseball07]

Hi everyone.  I have been looking for a way to implement an "if" statement for a while now on my programs with no success, so I was just wondering how people do this in LabVIEW.  For example, I have 2 different streams of data coming in (hex format) and would like to do seprate things with it.  Normally, I would write a program to say:

x = aa; 

y=bb;

if (data == x)

  then perform computations on this x data

else

if(data == y)

  then perform computations on this y data

However, the case structure seems to only work on boolean values.  How would one go about writing this code?  Can I implement some sort of comparison vi which triggers a true/fase switch?  Thanks very much.

[SteveChandler]

You can wire a string to a case structure. You can also wire integers. You need a default case or you will get an error. You do not need a default for a boolean as long as you have two cases and you do not need a default for an enum (integer) if you have a case for each item in the enumeration.

[TiTou]

If your data is a "short" string you can connect it directly to the selection terminal of the case structure and then create case for each value you want to be able to catch PLUS a default case for all other value.

If it's the same with decimal numbers.

If you data type is different then you have implement a more complexe condition detection.

Tell us more about your data type so we can tell you what the best option is.

Hope this helps

[JÞB]

You stated "I have 2 different streams of data coming in "

Since LabVIEW is a dataflow language you do not need to determine wheather the data is sourced from X or Y but simply wire the x data to the x process and the y data to the y process.

Case structures work with most base data types booleans, strings, integers and the error cluster (which it treats specially as a boolean) .  Look at the state machine design pattern for examples (File>>New...\Vi \Framworks\Design Patterns\ Standard State Machine)

[baseball07]

Got it, thanks everyone.  I am writing it now, if I have any questions I will be sure to post my program.  Thank you.