# c,rfDC format to FIF format

**URL:** <https://mne.discourse.group/t/c-rfdc-format-to-fif-format/5864>\
**Category:** Support & Discussions\
**Tags:** meg, data-import\
**Created:** [November 3, 2022, 7:41am UTC](https://mne.discourse.group/t/c-rfdc-format-to-fif-format/5864 "2022-11-03T07:41:43Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![chuna2002](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/chuna2002/32/2038_2.png) [@chuna2002](https://mne.discourse.group/u/chuna2002)\
**Post date:** [November 3, 2022, 7:41am UTC](https://mne.discourse.group/t/c-rfdc-format-to-fif-format/5864/1 "2022-11-03T07:41:43Z")

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Dear MNE’s,  
I am using mne python to draw the topology map of MEG data, but I have encountered a problem. The drawing function requires the data to be in FIF format, but the data I use is in c,rfDC format. I am wondering if there is any way to convert the format used to FIF format?  
Thank you!

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**Author:** ![richard](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/richard/32/15_2.png) [@richard](https://mne.discourse.group/u/richard)\
**Post date:** [November 3, 2022, 10:26am UTC](https://mne.discourse.group/t/c-rfdc-format-to-fif-format/5864/2 "2022-11-03T10:26:27Z")

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Hello @chuna2002 and welcome to the forum!

You can simply read the data with MNE. No need to convert to FIF first:

[https://mne.tools/stable/auto\_tutorials/io/10\_reading\_meg\_data.html#d-neuroimaging-bti-data-dir](https://mne.tools/stable/auto_tutorials/io/10_reading_meg_data.html#d-neuroimaging-bti-data-dir)

Best wishes,  
Richard

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<div class="post-metadata">

**Author:** ![chuna2002](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/chuna2002/32/2038_2.png) [@chuna2002](https://mne.discourse.group/u/chuna2002)\
**Post date:** [November 3, 2022, 10:46am UTC](https://mne.discourse.group/t/c-rfdc-format-to-fif-format/5864/4 "2022-11-03T10:46:03Z")

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Thanks for your reply!  
I know there is a way to read the data in c,rfDC format,but this format cannot use the plot\_topomap() and plot\_asrrowmap() function which use the data in FIF format , so I would like to know if there’s a way to switch between these two forms.  
ChuNa

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<div class="post-metadata">

**Author:** ![richard](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/richard/32/15_2.png) [@richard](https://mne.discourse.group/u/richard)\
**Post date:** [November 3, 2022, 10:50am UTC](https://mne.discourse.group/t/c-rfdc-format-to-fif-format/5864/5 "2022-11-03T10:50:43Z")

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Once data has been read by MNE, all functions should work with it. Please share your code and pinpoint exactly what is not working so we can get a better understanding of your problem. Please also share the output of

```python
import mne
mne.sys_info()

```

Thanks!

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<div class="post-metadata">

**Author:** ![chuna2002](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/chuna2002/32/2038_2.png) [@chuna2002](https://mne.discourse.group/u/chuna2002)\
**Post date:** [November 3, 2022, 12:33pm UTC](https://mne.discourse.group/t/c-rfdc-format-to-fif-format/5864/6 "2022-11-03T12:33:22Z")

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```python
import mne
pdf_fname = ('D:/A/104012/6-Wrkmem/4D/c,rfDC')
config_fname = ('D:/A/104012/6-Wrkmem/4D/config')
head_shape_fname = ('D:/A/104012/6-Wrkmem/4D/e,rfhp1.0Hz,COH')
sphere = mne.make_sphere_model(r0=(0., 0., 0.), head_radius=0.080)
t0 = 0.07 # peak of the response
raw = mne.io.read_raw_bti(pdf_fname, config_fname, head_shape_fname, convert=False, rename_channels=False, preload=True)
pos=raw.info
for i in range(287):
    if pos['ch_names'][i].startswith('A') is False:
        print(pos['ch_names'][i])
        raw.info['bads'].append(pos['ch_names'][i])
print(raw.info['bads'])
condition = 'TRIGGER'
evoked = mne.read_evokeds(pdf_fname, condition=condition, baseline=None)
times = np.arange(0.05, 0.151, 0.02)
evoked.plot_topomap(times, ch_type='mag')

```

 ![image](https://global.discourse-cdn.com/free1/uploads/mne/original/2X/0/0dfb4be0dc29d15cb0868411abc2db7b708467e1.png)

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<div class="post-metadata">

**Author:** ![richard](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/richard/32/15_2.png) [@richard](https://mne.discourse.group/u/richard)\
**Post date:** [November 3, 2022, 12:45pm UTC](https://mne.discourse.group/t/c-rfdc-format-to-fif-format/5864/7 "2022-11-03T12:45:25Z")

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You cannot read the raw data as evoked …

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<div class="post-metadata">

**Author:** ![chuna2002](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/chuna2002/32/2038_2.png) [@chuna2002](https://mne.discourse.group/u/chuna2002)\
**Post date:** [November 4, 2022, 2:04am UTC](https://mne.discourse.group/t/c-rfdc-format-to-fif-format/5864/8 "2022-11-04T02:04:30Z")

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Thanks！I have solved my problem. 😃

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<div class="post-metadata">

**Author:** ![richard](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/richard/32/15_2.png) [@richard](https://mne.discourse.group/u/richard)\
**Post date:** [November 4, 2022, 9:33am UTC](https://mne.discourse.group/t/c-rfdc-format-to-fif-format/5864/9 "2022-11-04T09:33:48Z")

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Great! What did you do?