# tckgen -\> tck2connectome -\> connectome2tck -\> tckedit reduces track counts.

**URL:** https://community.mrtrix.org/t/tckgen-tck2connectome-connectome2tck-tckedit-reduces-track-counts/5866
**Category:** Uncategorized
**Created:** [July 8, 2022, 10:24am UTC](https://community.mrtrix.org/t/tckgen-tck2connectome-connectome2tck-tckedit-reduces-track-counts/5866 "2022-07-08T10:24:14Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![Joseph\_Hong](https://community.mrtrix.org/user_avatar/community.mrtrix.org/joseph_hong/32/3932_2.png) [@Joseph\_Hong](https://community.mrtrix.org/u/Joseph_Hong)
#### Post date: [July 8, 2022, 10:24am UTC](https://community.mrtrix.org/t/tckgen-tck2connectome-connectome2tck-tckedit-reduces-track-counts/5866/1 "2022-07-08T10:24:14Z")

</div>

Hi everyone!

I’m studying about several filtering algorithms.  
I’m trying to run COMMIT2 made by Alessandro daducci lab.

During this work, I have two questions.

1. When I ran `tckgen`, `tck2connectome`, `connectome2tck`, and `tckedit` in order, track counts of `tckgen`’s and `tckedit`’s output were different (5M and about 3.3M each).

Could you explain why it happened?

The codes which I used are below.

```auto
tckgen \
dhollander_FOD_wm_norm_100408.mif \
dhollander_tractogram_SD_STREAM_100408.tck \
-act 5TT2b0_100408.mif -crop_at_gmwmi \
-seed_dynamic dhollander_FOD_wm_norm_100408.mif \
-maxlength 250 -select 5M -nthreads 36 -algorithm SD_STREAM

```

```auto
tck2connectome -force -nthreads 0 \
-assignment_radial_search 2 \
-out_assignments fibers_assignment.txt \
dhollander_tractogram_Schaefer400_SD_STREAM_100408.tck \
Schaefer400_7Net_2mm_100408.nii.gz \
connectome.csv

```

```auto
connectome2tck -force -nthreads 8 -exclusive -files per_edge -keep_self \
dhollander_tractogram_Schaefer400_SD_STREAM_100408.tck \
fibers_assignment.txt \
bundles/bundle_

```

```auto
C = np.loadtxt( f'{data_dir}/connectome.csv', delimiter=',' ) 
CMD = 'tckedit -force -nthreads 64'
k = 0
for i in range(C.shape[0]):
    for j in range(i,C.shape[0]):
        if C[i,j] > 0 :
            CMD += ' bundles/bundle_%d-%d.tck' %(i+1,j+1)
os.system( CMD + ' dhollander_tractogram_Schaefer400_SD_STREAM_connecting_100408.tck' )

```

1. Is there limitation the number of inputs in `tckedit`?

When I ran `tckedit` using all seperated bundles made by `connectome2tck`, it outputed -1 in terminal and there was nothing.  
So I ran `tckedit` using about 800 seperated bundles, then it worked.

Do you know the reason? and Could you explain how I run `tckedit` using all seperated bundles at the same time?

Any responses will be helpful!

Best,  
Joseph.