How to give a delay values for an array?

[NAGINENI]

Dear all,

I am trying to give the delay value in an array, the output is not updating w.r.to to an applied delay. if anyone has any idea about this problem. In case if we want to give generalized delay to the array values.

 

[Mark_Yedinak]

You are using a feedback node but you are not actually feeding any values back to it. Essentially what you have written is identical to simply wiring the array control to the array indicator. What exactly are you trying to accomplish?

[Mancho00]

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@NAGINENI wrote:

Dear all,

I am trying to give the delay value in an array, the output is not updating w.r.to to an applied delay. if anyone has any idea about this problem. In case if we want to give generalized delay to the array values.

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right-click>Properties>Configuration

[Mark_Yedinak]

Here is an example of how to use the feedback node with a delayed output.

The output array would be 0,0,1,2,3,4,5,6,7,8

[NAGINENI]

Here, I have attached the required output array. please look into it and give some suggestion

 

[Mark_Yedinak]

See my example above. It is doing exactly that.

[NAGINENI]

Thank you so much for your replay,

I have two queries about your approach,

1) For this particular example, here the output array is  0,0,1,2,3,4,5,6,7,8.

If we give the delayed by 2, the output array should be 0,0,1,2,3,4,5,6,7,8,9,10.

2) If we want to give the delay by 600, how can we proceed further?

[Mark_Yedinak]

What is your specific use case? How are you planning on using this? Feedback nodes are generally used in a continuous, repeating process to retrieve a value from the previous execution. If you simply want to construct data data set and then use it, there are more direct ways of getting that. In my example I simply set how many times I wanted the loop to run. If you wanted all the values, simply add your delay amount to the size of the data array and the loop will execute that many times and give you the complete array with the first two initial values of 0s. To change the behavior to have a delay of 600, the array initializing the feedback node would need to be an array of 0s with 600 elements.

The delay setting on the feedback node is not settable programmatically so it is not very flexible in that regard.

[NAGINENI]

 Firstly, I am trying to implement the 1-D transfer function with the delay node. In the future, I am planning to use this concept of delay block for the implementation of the 2-D (image) transfer function as shown here.

Suppose if we have an image and its size is 640*480. if we want to use this image as an input to the above transfer function, how to give the delay nodes in the horizontal direction and vertical direction for getting the processed image, is there any 2-D feedback (delay node) VI available in the LabVIEW?

[altenbach]

A feedback node accepts arrays of any number of dimensions.

Your descriptions are not really clear. can you point to a website that describes the algorithm?

If you want a variable delay of up to 600, you need to keep that many instances of the primary data. You need to maintain a buffer (initialized with some special sentinel value, such as NaNs) and some programming to maintain information of the insert point, allowing you to calculate the index of any history value, while overwriting the oldest data as new data arrives. If the data size does not change, it can all be done in-place.