如何在Matlab中计算单元格的唯一元素？
 

我想计算Matlab中单元格数组的唯一元素。我怎样才能做到这一点？谢谢。

c = {'a', 'b', 'c', 'a'}; % count unique elements, return the following struct unique_count.a = 2 unique_count.b = 1 unique_count.c = 1

[B]回答：[/B]

要计算唯一元素，可以将[URL="http://www.mathworks.com/help/techdoc/ref/UNIQUE.html"]UNIQUE[/URL]与[URL="http://www.mathworks.com/help/techdoc/ref/ACCUMARRAY.html"]ACCUMARRAY[/URL]结合使用

c = {'a', 'b', 'c', 'a'}; [uniqueC,~,idx] = unique(c); %# uniqueC are unique entries in c %# replace the tilde with 'dummy' if pre-R2008a counts = accumarray(idx(:),1,[],@sum); 要生成结构，请使用[URL="http://www.mathworks.com/help/techdoc/ref/NUM2CELL.html"]NUM2CELL[/URL]和[URL="http://www.mathworks.com/help/techdoc/ref/struct.html"]STRUCT[/URL] ：

countCell = num2cell(counts); tmp = [uniqueC;countCell']; %' unique_count = struct(tmp{:}) %# this evaluates to struct('a',2,'b',1,'c') unique_count = a: 2 b: 1 c: 1

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