I don't understand this error in Matlab 2021a: Error using slice (line 65) V must be a 3-D array.

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I'm trying to simulate photon interaction on a Z-layered slab, my code is below:
cfg.shapes=('{"Shapes":[{"Grid":{"Tag":1,"Size":[60,60,60]}},{"ZLayers":[[1,5,2],[5,10,3],[10,20,4]]}');
cfg.prop=[0.0000, 0.0000, 1.0000, 1;
3.5640, 1.0000, 1.0000, 1.3700;
18.0543, 9.3985, 0.9000, 1.3700;
1.4000, 30.0000, 0.9000, 1.3700];
cfg.tstart=0;
cfg.tend=5e-9;
cfg.tstep=5e-10;
figure
% a pencil beam outside the volume
cfg.srctype='pencil';
cfg.srcpos=[30 30 -10];
flux=mcxlab(cfg);
fcw=flux.data*cfg.tstep;
hs=slice(log10(abs(double(fcw))),[],25,1);
Any help would be great thanks.

Accepted Answer

Voss
Voss on 14 Oct 2021
This error happens because fcw is not a 3-D array. You should inspect flux.data to see if it's what you expect.

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