It's not clear what's actually in the output array. It's a cell array, where the first column contains char vectors converted from scalar integers. The second column contains a thousand copies of the same array of unknown size. I assume the array is ostensibly numeric.
If those array copies are already numeric, then the only non-numeric content in the cell array is in column 1, which was intentionally converted from numeric. The solution would be to simply not create the problem in the first place.
Since it's unclear what the geometry of the array copies in column 2 are (or expected to be), it's not really clear whether it's expected that the cell array can be converted into a numeric array. It's also not clear why you'd need a thousand copies of the same array. If this is just prototype code and those offsets change in the loop, then it's not even clear that the resultant arrays would have the same size.
