Issue running the RUNICA function in the EEGLab toolbox

Hi,

I'm trying to use the function "runica" from the eeglab toolbox to decompose a fairly large data set. Now I've been testing it on a small sample of the data (5 channels) to figure out what do do but have hit a snag with the outputs.

From the command:

[weights,sphere,project,activations]=runica(datiatt([1:5],:));

I am getting the following outputs:

>Weights == 5x5 double, -6.485min, 8.232max

>Sphere == 5x5 double, -0.0225min, 0.0323max

>Project =[2.041472649833849e+04,1.057366806435951e+03,8.424862489971001e+02,5.5
08867487460723e+02,86.325649879637750] , 86.3256 min, 2.0415e+04 max

>Activations== [0.521181380438761;-
0.503483128865776;0.168416662178569;0.087787753657055;-
0.278149228696979], -0.5035 min, 0.5212 max.

The issues I'm having

• Activations is not equal to 128*length of datiatt matrix.
• When trying to compute the unmixing matrix so that I can view the components and re-run my psd analysis I am getting the error message:

W=weights*sphere "matrix dimensions do not match".

Without being able to create 'W' I can't go any further with the analysis.

Does anyone have any helpful hints or suggestions?

Thanks

Answer 1

[Walter Roberson]

Please show the exact error message for the multiplication. Also, please show size(weights) and size(sphere)

Your list of outputs shows Weights and Sphere in capitals. Please cross-check upper/lower case use, especially for Sphere, as there is a function sphere that could possibly be invoked if Sphere (capital) had been used for the variable.