add data from DAQmy Read (Analog 1D Wfm NChan NSamp) to shift register

[avstenit]

If I try to attach the file I get the following error:

The contents of the attachment doesn't match its file type.

[GerdW · Accepted solution]

About that upload error! It's well known and that error exists for a long time…

On your specific VI problem:

The "before append" indicator shows an empty array because you initialized the shift register with an empty array!

You need to:

- initialize the shift register with a non-empty constant

or even better:

- handle that special case of empty input seperately!

[avstenit]

I have written some explains about the for loop behavour and I have also attached the link to the file, if one could maybe take a look.

[avstenit]

Thanks! Well I think if I initialize a shift register with non-empty contstant this data will get appended and modify the real measured that is not ok. So I think that I should go with case structure to check if shift register is empty or not - am I looking in the right direction? How can I check if shift register is empty?

[GerdW]

Hi avstenit,

look into the comparison functions palette. There used to be a function to test for empty arrays…