Add Columns of Array

[ap8888]

I'm having somewhat of an elementary problem here...

I start with a 1D Waveform from a DAQ request, which contains ~22 columns of data corresponding to different measurements. I wanted to take the first 20 columns of this data and add the "column vectors" (i.e. each measurement) to get a 1D array (the summation of the first 22 1D arrays/measurements/vectors). The logical way to do this, it seems, is by indexing the waveform with a for loop, converting to DBL, and then adding each column with a shift register.

1D Waveform --> For loop (indexed) --> Get Waveform Components to get DBL Array for the index column --> Go to "add" block

And then by using a shift register I add each index column.

However, I get no output once the for loop finishes.

Any ideas? Examples are JPEGs/PNGs please!

[Fernando0901]

This might help you out

[altenbach]

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@ap8888 wrote:
However, I get no output once the for loop finishes.

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Please attach your code.

[ap8888]

Thank you both for the help.

I always thought an indexer of a for loop indexes columns, not rows. But in Fernando's example it seems like rows are being index, then summed.

Why, for example, is the attached not working?

[Fernando0901]

array a = [1,2,3]

array b = [1,2,3,4,5]

in LV a+b = [2,4,6].

In your case you are adding [] to [n, n+1, n+2]. You cannot do this.

In this situation, you should have used the "build array" function, right clicked it, and selected "concatenate inputs."

[Fernando0901]

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@Fernando0901 wrote:

In your case you are adding [] to [n, n+1, n+2]. You cannot do this.

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You can do this, it just wont work the way you want 😉

[JÞB · Accepted solution]

I'm a big fan of doing things the easy way.

[ap8888]

So to verify, the attached two blocks perform the exact same summing (of columns) operation?

Thanks

[JÞB]

Summed would have the same result in either case- Which is quicker to sling?  What if you wanted to really boost the array size and started bogging down a CPU core?  Which for loop is parallelizable?

One.jpg on all counts.

Now wait for Altenbach,  He'll chime in with a perfomance enhancement

Hold it..... I'm channelling.

For even better perfomance, since the size of the output array can be determined.  Initiallize an array of the required size and replace index[i] inside the loop.  This prevents re-allocating the array buffer multiple times as the array size grows"

[uni-pixel]

Hi

I try to find the number of ones in array at the end but it is not working.

Could some one help?