MATLAB: Merging cell arrays with variable number of elements

Question

I have a cell array x that can be of two forms depending on some condition cond

if cond x = {A B1 B2 C} else x = {A B1 B2 B3 C} end

where A, B1, B2, B3, and C are all row vectors. I want to define a variable B that gets set based on cond, and then have a single expression for x:

if cond B = {B1 B2} else B = {B1 B2 B3} end x= {A B C}

The above does not work because it will treat B as a cell array, not a group of vectors. For instance, with cond = 0, we get something like the following type for x

 [1x2 double]    {1x3 cell}    [1x2 double]

How could I make the result to look like

 [1x2 double]    [1x3 double] [1x5 double] [1x2 double]   [1x2 double]

Thanks Farzad

Answer 1

 x = {A, B{:}, C} ;

In this expression, B{:} is a comma separated list (CSL); it is equivalent to listing B's cells' content separated by commas.