Jennifer, it's hard to answer this question without knowing whether "table" means "the MATLAB table data type" or something else, and without knowing what is in the table. Walter's suggestion assumes a table as in "the data type", and further, that variables 2 and 4 in that table are valid inputs to unique(...,'rows'). (Walter, Gold Star for writing working code despite apparently not being able to run it, although you actually only need 13b or later to use tables.) Given that, here's a (perhaps) slightly more direct version of Walter's code:
[~,~,i] = unique(BigTable(:,[2 4]));
for k = 1 : max(i)
TableCell{k} = BigTable(i == k,:);
end
If you're into the whole brevity thing, rowfun lets you do it without a loop:
rowfun(@(x1,x2,x3,x4) table(x1,x2,x3,x4),BigTable, ...
'InputVariables',1:4,'GroupingVariables',[2 4], ...
'OutputFormat','cell')
But Jennifer, given the warning and error that you're getting, it seems likely that either you don't have a table, or the table contains something unusual in those variables. You'll have to provide a short example of your data.
