Getting error in computing noise covariance matrix

1

Hi,
I am getting the following error can you explain the error and how can i rectify it?

Error using bst_noisecov/ReadRecordings
Number of channels is not constant.

Error in bst_noisecov (line 289)
    [DataMat, iTimeBaseline, iTimeCov] = ReadRecordings();

Error in tree_set_noisecov (line 71)
            bst_noisecov(iTargetStudies, iStudies_data, iData, [], isDataCov);

Error in tree_callbacks>@(h,ev)tree_set_noisecov(bstNodes,'Compute',0) (line 2620)
            gui_component('MenuItem', jMenu, [], 'Compute from recordings', IconLoader.ICON_NOISECOV,
2

Hi @Tanmay,

Noise covariance is computed using ALL channels. Thus, this error is produced as the selected recordings have a different number of channels.

Are you trying to compute a noise covariance using recordings from different runs?
This should be done if and only if the runs use the same channel file.

  • Could you share a screen shot of the tree database in Brainstorm?
  • How was your data imported?
  • Which files you want to use to compute the noise covariance?
  • Which channels are extra (or missing) across the different channel files?
3

Hi
I have 63 channel file recording but not electorde position can you add 63 electrode position file?
It would be helpful

4

Not having the electrode positions should not produce the reported error.

Could you reply the questions from the post above?
These will provide us with more information to assist you.