please help!! DCT blank problem!...stanford university lab 1 problem!

[kimjihwan123]

dear genius.

I am reading a lab pdf in standford university.(https://decibel.ni.com/content/docs/DOC-17962).

I just a beginner in labview and exercise the problem.

I want to fill the blank in "finish the dct block"

this is the problem.

I think I almost come. However, If I tested DCT, then waveform goes to zero values except t=0( false case in block diagram)

please let me know how can I get normal waveform??