How to concatenate strings in a cell array in matlab

Question

I am trying to concatenate strings in a cell array using repmat in matlab.

What I want to do is something like:

aa={'xx','yy',repmat({'zz'},1,3)}

with the result equivalent to:

aa={'xx','yy','zz','zz','zz'}

but instead the result is:

{'xx','yy', {1x3 cell array} }

I realize that if I had a variable such as C=repmat('zz',1,3) then I could do

aa{'xx','yy',C{:}}

but the problem is I don't want to define any other variables like C. I want to do this in line if possible. Any ideas?

user2999345 · Accepted Answer · 2017-05-03 12:23:56Z

2

use vector concatenation:

aa=[{'xx','yy'},repmat({'zz'},1,3)]

aa = 
    1×5 cell array

     'xx'    'yy'    'zz'    'zz'    'zz'

answered May 3, 2017 at 12:23

user2999345

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4 Comments

Ben Barrowes Over a year ago

Good. This works, but is there no way to do this with a function on repmat? What I was hoping for is a function that takes a cell array and converts it into a comma separated list, i.e. that reproduces the C{:} behavior. For example: colonoperator(repmat({'zz'},1,3)) that outputs a comma separated list.

rayryeng Over a year ago

@BenBarrowes You honestly can't. Why are you opposed to temporary variables?

user2999345 Over a year ago

does reshape([{'xx','yy'},repmat({'zz'},1,3)],[],1) work for you?

Ben Barrowes Over a year ago

I tried using subsref to get a comma separated list from a cell array, but that does not seem to work for cells though it does for numerical arrays:groups.google.com/forum/#!topic/comp.soft-sys.matlab/… user2999345 your suggestion also works, but I was hoping for a function that operates on a cell array to produce a comma separated list.

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