PARALLEL PROCESS

[m240597]

I NEED TO GENERATE RANDOM NUMBERS AT A DETERMINED FREQUENCY 
WITHIN THE CONFIGURED TIME. 
FOR EXAMPLE MY CONFIGURED TIME IS 30 SECONDS AND
 I WANT TO GENERATE RANDOM NUMBERS EVERY 400 mS, 
AND THESE  RANDOM NUMBERS PUT INSIDE AN ARRAY

[Blokk]

I suggest you to take some online course, you can find these here (pay special attention to shift registers, and timing):

(from Hooovahh copypaste)

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[GerdW]

Hi m,

most of the things in your VI doesn't make any sense - and seem unrelated to your problem…

FOR EXAMPLE MY CONFIGURED TIME IS 30 SECONDS AND I WANT TO GENERATE RANDOM NUMBERS EVERY 400 mS, AND THESE  RANDOM NUMBERS PUT INSIDE AN ARRAY 

No need to shout - or is your keyboard broken?

All you need is a Quotient&Remainder function, a FOR loop with a wait and the Random function inside. LabVIEW does the rest by autoindexing!

FOR i:= 0 to "configured time" QR delay
  rnd()
  wait(delay)
NEXT

[Bob_Schor]

Ask your classmates how they handled this Homework Assignment.  But don't, of course, "copy" their paper ...

[altenbach]

As a first step, please explain to me why the thread is named "PARALLEL PROCESS". Where is the parallel part?

As a second step, try sprinkle a little bit more thought into whatever you are wiring. For example, look at the two locations (A, B) in the image. There is no logic to your logic!

What do you think would happen if you remove the "select" (A), the "OR" (B), and the three boolean diagram constants and just wire across? Nothing would change! Both constructs just return the boolean input unchanged. Right?

Just plain silly!

ALSO:

• You only need to set the slide max property once outside the loop, not with every iteration, especially since the control is only read once.
• You can get rid of the "ELAPSED TIME" indicator and just show the digital display of the slide (right-click...visible items...digital display).
• Your "SETTING TIME" control has the wrong representation. If you want to limit it to integers, you can do that using the "data entry ..." option.
• Your loop does not need to spin millions of times per second, so add a reasonable wait.

[Bob_Schor]

My apologies -- I didn't notice you attached some code until I read Altenbach's post.  So here are some hints:

• Think more about What you want to do, less about how to do it.
• For example, "Generate Random numbers at a certain frequency".  You know how to generate one RN -- what does "at a certain frequency" suggest?  More exactly, what does "every 400 msec" suggest?
• Suppose I said I wanted to do something for 30 seconds at 2.5Hz.  How many of these things do I need to do?
• Do these questions suggest very simple code ideas to you?

Bob Schor

[altenbach]

You also need to properly define what you mean by a "random number".

• A random number in the interval 0..1?
• A random integer in a certain range (e.g. dice (1..6), lotto number, etc).
• A random number with a gaussian probability distribution?

What should the user see during the run? e.g.

• An array that grows by one element every 400ms? (less efficient)
• A full sized array containing NaN where elements are replaced with random numbers in order (more memory efficient)
• Just the current random number and the final array only at the end? (more efficient)

...