Not sending"false" out when not true

[jonaskj]

Hey

I have a program where i  whish  to send out the value from the source,  only when  the true signal comes.  Using case structurs or true/false sends something outwhen  the  state is false. I want it to only send when true.

What I want to happend in the program is, that I check a array  off leds. When I have found the index off it Iget a true signal. and the index in the for loop gives me the decimal off the position. Problem is that I dont want a decimal out when the signal is false. Only when  I  get the truth signal i  want it to be written out.

[becktho]

Hi

I'm not sure about what you want to do, but in general, you can't have a wire without a value.

If you have a wire, it always transports a value. You can't avoid this, as this is due to the dataflow.

You could just define a special value (often -1), which is passed out of your structures, if you did not find a valid index. By the way - this is what the "search 1D array" function does.

Hope this helps.

Thomas

[jonaskj]

Thank you very  much

so I can  put -1 on false input? Cause I want the position like 0, 1, 2 and so on.  And when i get the position on  the true signal want the value  out  and translate  the "position decimal" to a binary word.

[becktho]

I can't give you a helpful answer, if I don't understand what you want to do.

Could you clearify a little bit or post what you've done up to now (vis or picture (no *.bmp)).

[JeanPierre]

The only way is to execute the relevant code inside the true case of a case structure. Outside the case structure the boolean must have a value.

[shoneill]

What you want to do (or at least how you describe it) cannot be done.

Instead, define a "nonsense" value which is passed if no TRUE is found, this way by checking if the index is equal to this value, you know no TRUE was found.

As stated already, this is exactly what "Search array" does.

See attached vi and tell us what's wrong with that.....

Shane.

[jasonhill]

You could use an empty array, populating only the "true" instances from the input array.  If all the inputs are false, the array is still empty.  In general, I am more interested in which indicators are true, so I included an array of indexes to capture them.

[jonaskj]

Thanks for all replys. I will come back with picktures and better explanations on monday. And will take a look at it then.

thanks a lot!

Jonas