# error when using mne\_read\_forward\_solution: operands must be convertible to logical scalar **URL:** \ **Category:** Mailing List Archive (read-only)\ **Tags:** list-archive\ **Created:** [June 9, 2012, 7:35pm UTC](https://mne.discourse.group/t/error-when-using-mne-read-forward-solution-operands-must-be-convertible-to-logical-scalar/453 "2012-06-09T19:35:18Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\ **Post date:** [June 9, 2012, 7:35pm UTC](https://mne.discourse.group/t/error-when-using-mne-read-forward-solution-operands-must-be-convertible-to-logical-scalar/453/1 "2012-06-09T19:35:18Z")
This is what I got at the Matlab command window: > > [fwd]=mne\_read\_forward\_solution(fname,force\_fixed); Reading forward solution from A6\_ec1\_fen\_ds250\_ico3\_bem5120\_fwd.fif...             Reading a source space...[done]             Reading a source space...[done]             2 source spaces read             Read EEG forward solution (1284 sources, 257 channels, free orientations)             Source spaces transformed to the forward solution coordinate frame ??? Operands to the || and && operators must be convertible to logical scalar values. Error in ==\> mne\_read\_forward\_solution at 246 if fwd.source\_ori == FIFF.FIFFV\_MNE\_FIXED\_ORI || ... There was no complaint when I used this forward solution in my analysis to compute inverse solutions in mne\_analyze. How should I begin troubleshooting this? -Jeff -------------- next part -------------- An HTML attachment was scrubbed... URL: [http://mail.nmr.mgh.harvard.edu/pipermail/mne\_analysis/attachments/20120609/48c90a48/attachment.html](http://mail.nmr.mgh.harvard.edu/pipermail/mne_analysis/attachments/20120609/48c90a48/attachment.html) ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\ **Post date:** [June 10, 2012, 9:20am UTC](https://mne.discourse.group/t/error-when-using-mne-read-forward-solution-operands-must-be-convertible-to-logical-scalar/453/2 "2012-06-10T09:20:44Z")
Did you set force\_fixed to either true or false. I do not have any trouble reading your forward solution. - Matti ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\ **Post date:** [June 10, 2012, 6:47pm UTC](https://mne.discourse.group/t/error-when-using-mne-read-forward-solution-operands-must-be-convertible-to-logical-scalar/453/3 "2012-06-10T18:47:53Z")
I also have no problem reading your fwd solution. do you have the latest mne-matlab code [1] ? Alex [1] [https://github.com/mne-tools/mne-matlab](https://github.com/mne-tools/mne-matlab) ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\ **Post date:** [June 10, 2012, 7:04pm UTC](https://mne.discourse.group/t/error-when-using-mne-read-forward-solution-operands-must-be-convertible-to-logical-scalar/453/4 "2012-06-10T19:04:35Z")
> I also have no problem reading your fwd solution. > > do you have the latest mne-matlab code [1] ? I think the problem was that that force\_fixed could not be interpreted as logical value. It should be one of true/false. - Matti