How to reference value in 14x19x101 array

I have a dataset freq_segmented which contains EEG FFT data from 14 trials from 19 channels for 101 freqencies (3-15 in tenths of a hz) stored in the field powspectrm.

When I look at the data it appears as below. Val(:,:,1) continues to val(:,:,101).

It appears that the 19 columns hold data for the 19 channel sensors, 1 value per 101 frequency portions.

How can I access a particular row, column, and frequency?

">> freq_segmented.powspctrm" returns the data as formatted in the image above.

">> freq_segmented.powspctrm{:,:,1};" returns the error Cell contents reference from a non-cell array object.

">> freq_segmented.powspctrm.val(1,1,1);" returns the error Struct contents reference from a non-struct array object.

">> freq_segmented.powspctrm(:,:,1);" returns nothing

Answer 1

[Stephen23]

Try basic subscript indexing:

mat = freq_segmented.powspctrm(:,:,1)

without the semi-colon (which suppresses output from being displayed).

https://www.mathworks.com/help/matlab/math/array-indexing.html

https://www.mathworks.com/help/matlab/math/multidimensional-arrays.html

[Stephen23]

Mark Jones'S "Answer" moved here:

Oh my, if I don't look like a rank newbie . . . which I am!

Thanks, Stephen. That cleared it up for me.

Mark

[Stephen23]

@Mark Jones: I hope that it helped. Remember to accept my answer, this is the easiest way to thank the volunteers on this forum.