topic Re: array values peoblem in LabVIEW

array values peoblem

GuyGor — Thu, 28 Apr 2016 19:52:31 GMT

Hi,

I have an array of power in dbm and I want to know how much amplification I need to add in order to bring the array to be in a specific power value for all frequencies. I guess I need a loop to check for each frequency but don't know yet how to do so. Some of the array values are negetive and some positive but at the end they all have to be the same so I need to know for each frequency how much amplification I need.

TNX

Guy

Re: array values peoblem

GerdW — Thu, 28 Apr 2016 20:07:42 GMT

Hi Guy,

I guess I need a loop to check for each frequency but don't know yet how to do so.

Yes, a loop may help. When you don't know how to use loops (and autoindexing) in LabVIEW: take the free beginner courses offered by NI on their website!

Some of the array values are negetive and some positive but at the end they all have to be the same

When all values should be the same in the end a simple InitializeArray function may give the same results… (Irony!)

so I need to know for each frequency how much amplification I need.

amplification := target_value - current_value…

Remember the polymorphism of LabVIEW functions and you will not need a loop anymore…

Edit:

At a first glance it seems to me you already asked the same here and got answers (and even said "now it's working")…

Re: array values peoblem

GuyGor — Thu, 28 Apr 2016 20:16:55 GMT

Target value - current value won't be good if the current value is negetive and for the positive option I still need to take that and to put each value in an array and to supply the correct amplification according to the comparing.

I see I have a lot of Arrays learning to do, so I am strating with the videos now.

Thanks 🙂

Re: array values peoblem

crossrulz — Thu, 28 Apr 2016 20:29:19 GMT

@GuyGor wrote:
Target value - current value won't be good if the current value is negetive

How do you figure? Subtract a negative value and you have an add by the absolute value. For example: Target = 5 and Current = -10. 5 - (-10) = 15. So you need to amplify by 15dB.

Re: array values peoblem

GuyGor — Thu, 28 Apr 2016 20:35:04 GMT

Its is not the same question

Re: array values peoblem

GuyGor — Thu, 28 Apr 2016 20:37:09 GMT

TNX