Extracting First n elements of array

[lucasphee]

Hello,

For a program I am creating I need exactly 16384 data points of a current waveform.  This is a strange number but is a requirement for a VI from a driver for a function generator.  I have many csv files of waveforms that I would like to use.  However, some of the waveforms have more and some of them have less than this number of data points.  Therefore, if there are more data points, I want to cut off and extract only the first 16384 data points and use those.  When there are less, I want to just add zeros after the last data point until I have enough of them.  I then need to put this data back into a csv file as that is what the function generator VI takes as an input. What are some of the best ways to do this?

Thank You

[GerdW]

Hi lucasphee,

to ensure exactly 2^14 elements in your array you could append 2^14 zero elements to the input array, then uase ArraySubset to take the first 2^14 elements:

[lucasphee]

Hello,

I was able to figure out my question on my own but thank you for the response!

[wiebe@CARYA]

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@GerdW wrote:

Hi lucasphee,

to ensure exactly 2^14 elements in your array you could append 2^14 zero elements to the input array, then uase ArraySubset to take the first 2^14 elements:

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A reshape array would bot shrink and grow an array to that size:

The 'fill value' can't be set though.

[wiebe@CARYA]

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@lucasphee wrote:

Hello,

I was able to figure out my question on my own but thank you for the response!

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Others could benefit from your solution. Please post it.

It help if you accept a (your) solution. It keeps the forum clean...

[lucasphee · Accepted solution]

To get the first n elements all I had to do was use the Array Subset and connect the number n to the length input.  The output was the first n elements of the array.

[wiebe@CARYA]

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@lucasphee wrote:

To get the first n elements all I had to do was use the Array Subset and connect the number n to the length input.  The output was the first n elements of the array.

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Thanks for posting and accepting a solution!

Keep in mind that this method will only shrink the array. If that is your situation, it is indeed the simplest and best solution.