# read\_custom\_montage neuroscan compumedics file **URL:** \ **Category:** Support & Discussions\ **Tags:** montage, data-import\ **Created:** [June 30, 2022, 1:05am UTC](https://mne.discourse.group/t/read-custom-montage-neuroscan-compumedics-file/5179 "2022-06-30T01:05:28Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![louisestolz](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/louisestolz/32/1659_2.png) [@louisestolz](https://mne.discourse.group/u/louisestolz)\ **Post date:** [June 30, 2022, 1:05am UTC](https://mne.discourse.group/t/read-custom-montage-neuroscan-compumedics-file/5179/1 "2022-06-30T01:05:28Z")
Hello, I am trying to get MNE to read my montage from a compumedics neuroscan EEG system, but it cannot seem to identify the channel locations from my file. I have Windows 11 and am using Curry 9 to record EEG data. My “chanlocs” file is a .csv with ‘label’ for channels, x,y,z coordinates and other measures. Here is my code: fname = ‘chanlocs’ path\_chan = r’C:\Users.…\chanlocs.csv’ montage = mne.channels.read\_custom\_montage(path\_chan) And the error: ValueError Traceback (most recent call last) Input In [58], in \() 1 fname = ‘chanlocs’ 2 path\_chan = r’C:\Users\Louise\Desktop\eeg data\n-back\chanlocs.csv’ ----\> 4 montage = mne.channels.read\_custom\_montage(path\_chan) File ~\Anaconda3\envs\mne\lib\site-packages\mne\channels\montage.py:1399, in read\_custom\_montage(fname, head\_size, coord\_frame) 1396 montage = \_read\_brainvision(fname, head\_size) 1398 elif ext in SUPPORTED\_FILE\_EXT[‘xyz’]: → 1399 montage = \_read\_xyz(fname) 1401 if coord\_frame is not None: 1402 coord\_frame = \_coord\_frame\_const(coord\_frame) File ~\Anaconda3\envs\mne\lib\site-packages\mne\channels\_standard\_montage\_utils.py:392, in \_read\_xyz(fname) 390 ch\_names.append(ch\_name) 391 pos.append((x, y, z)) → 392 d = \_check\_dupes\_odict(ch\_names, np.array(pos, dtype=float)) 393 return make\_dig\_montage(ch\_pos=d) ValueError: could not convert string to float: ‘’ Here is a snapshot of what the csv file looks like: ![image](https://global.discourse-cdn.com/free1/uploads/mne/original/2X/8/85cf21837b1d051f453071bc7b15c482b5895f38.png) I have edited the csv file to have x,y,z in the first columns and channel labels in the last. Same error occurs. Any help is greatly appreciated! ---
**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:** [June 30, 2022, 6:36am UTC](https://mne.discourse.group/t/read-custom-montage-neuroscan-compumedics-file/5179/2 "2022-06-30T06:36:35Z")
Hello @louisestolz and welcome to the forum! Could you please share the original CSV file here? Open it in a text editor ( **not** in a spreadsheet program), paste the contents here, select what you’ve pasted, and click on the Preformatted text button in the toolbar. Thanks! Richard ---
**Author:** ![louisestolz](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/louisestolz/32/1659_2.png) [@louisestolz](https://mne.discourse.group/u/louisestolz)\ **Post date:** [July 1, 2022, 1:09pm UTC](https://mne.discourse.group/t/read-custom-montage-neuroscan-compumedics-file/5179/3 "2022-07-01T13:09:54Z")
Hi Richard, Thank you for your response! I actually resolved the issue since the code was correct, but I had an outdated file from Compumedics - attached is the updated QuickCap64 montage for future reference. Louise ```python |Label|x (mm)|y (mm)|z (mm)| |---|---|---|---| |Fp1|-29|104.536|33.1255| |Fpz|1|109.203|38.6223| |Fp2|30|104.651|34.1187| |AF3|-34|101.932|62.625| |AF4|36|101.054|63.734| |F11|-74|46.771|-30.6181| |F7|-70|61.8921|30.0395| |F5|-66|68.4593|60.4841| |F3|-52|76.7816|88.7107| |F1|-28|84.0625|107.998| |Fz|2|88.7299|113.494| |F2|31|84.8243|105.895| |F4|53|78.6525|87.4859| |F6|66|69.684|62.3549| |F8|70|61.2459|33.1351| |F12|74|44.4855|-24.3113| |FT11|-80|18.5638|-39.413| |FC5|-77|39.5866|71.902| |FC3|-62|47.61|106.204| |FC1|-34|54.3605|129.58| |FCz|3|57.2728|137.295| |FC2|37|54.129|127.593| |FC4|63|48.3719|104.102| |FC6|77|40.6956|72.7796| |FT12|79|16.394|-32.1129| |T7|-84|3.51988|38.8537| |C5|-83|8.38021|80.5715| |C3|-69|14.7642|118.085| |C1|-37|18.882|144.788| |Cz|3|22.0258|154.489| |C2|40|19.6438|142.685| |C4|69|15.7575|117.969| |C6|83|9.48921|81.4491| |T8|84|3.98277|42.8268| |TP7|-82|-26.0471|44.3119| |CP5|-81|-25.3914|84.5061| |CP3|-67|-22.9805|122.482| |CP1|-36|-20.8493|149.417| |CPz|3|-17.8212|158.125| |CP2|40|-18.1009|147.083| |CP4|67|-19.0074|122.019| |CP6|80|-21.1868|86.0298| |TP8|82|-24.591|48.1693| |M1|-76|-41.2549|8.83346| |M2|77|-38.4583|15.555| |P7|-73|-54.5051|50.6477| |P5|-68|-55.6527|84.0046| |P3|-56|-55.1609|114.15| |P1|-30|-54.7173|135.241| |Pz|2|-52.9139|142.078| |P2|32|-52.7307|135.009| |P4|56|-53.1743|113.919| |P6|68|-52.5571|84.6507| |P8|72|-52.1714|53.3961| |PO7|-54|-77.6496|59.3847| |PO3|-37|-79.559|94.8439| |POz|2|-78.7007|110.852| |PO4|37|-78.6814|93.7349| |PO8|55|-75.5473|60.1466| |O1|-29|-91.8544|67.0803| |Oz|1|-94.0242|74.3804| |O2|30|-90.7454|67.9578| |Cb1|-28|-92.8091|32.9615| |Cb2|31|-90.7069|33.7234| ``` ---
**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:** [July 1, 2022, 1:57pm UTC](https://mne.discourse.group/t/read-custom-montage-neuroscan-compumedics-file/5179/4 "2022-07-01T13:57:18Z")
Thanks for sharing! So the file contains **literally** those `|` characters??? You sure this wasn’t edited by hand by someone?