Preparation of the data for N-way ANOVA (anovan)

I have 3 matrices for 3 different modalities while processing the neuronal data (results);

1 st matrix with the size of (100 x 5)

2 nd matrix with the size of (50 x 5)

3 rd matrix with the size of (75 x 5)

I refer to the documentation of 'anovan' and to the section 'preparation of the data'. However, I am bit confused about how can I do convert/combine these 3 different matrices so I can perform N-way ANOVA.

Can anyone help me understand quickly? Thanks