# [ot][spam][random][crazy][random][crazy]

Undescribed Horrific Abuse, One Victim & Survivor of Many gmkarl at gmail.com
Mon Nov 21 01:21:02 PST 2022

```# this is after all summing (using multiplication by cos instead of addition):
(Pdb) p longvec
8.797795339894686

# this is supposed to be the same, and isn't
(Pdb) p (inserting_spectrum @ extracting_ift)
0.5488135039273254

0413
(Pdb) complex_shortspace_freqs = fftfreq(complex = True, dc_offset =
True, repetition_samples = len(randvec))
(Pdb) p complex_freq2time = create_freq2time(freqs=complex_shortspace_freqs)
(Pdb) p complex_freq2time[:,0]
array([0.0625+0.j, 0.0625+0.j, 0.0625+0.j, 0.0625+0.j, 0.0625+0.j,
0.0625+0.j, 0.0625+0.j, 0.0625+0.j, 0.0625+0.j, 0.0625+0.j,
0.0625+0.j, 0.0625+0.j, 0.0625+0.j, 0.0625+0.j, 0.0625+0.j,
0.0625+0.j])

Since the index is zero, the first sample is the average of all the magnitudes.

(Pdb) p extracting_ift[:,0]
array([ 0.0625, -0.    ,  0.125 , -0.    ,  0.125 , -0.    ,  0.125 ,
-0.    ,  0.125 , -0.    ,  0.125 , -0.    ,  0.125 , -0.    ,
0.125 , -0.    ,  0.0625, -0.    ])

extracting_ift is real-domain-only, so it is supposed to store some
values doubled. It looks like they cancel and amplify.

I made the wrong frequencies. These are the longspace ones. Oops. I
should probably check the shortspace ones before the longspace ones.

(Pdb) p randvec
0.5488135039273248

Looks like the first value is right; so in theory something about my
cosine code is wrong.

Here's how it's generated properly:
(Pdb) p (inserting_spectrum * extracting_ift[:,0]).sum()
0.5488135039273254

I'm remembering that I'm ignoring the doubling performed by the
real-domain transform. That must be the next mistake.
```