Comparing cell arrays of symbolic variables

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Leo Simon 2016-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/267144-comparing-cell-arrays-of-symbolic-variables

评论： Walter Roberson 2016-2-8

I'd like to be able to compare two arrays, each consisting of symbolic variables. In particular I'd like to be able to run setdiff on them. But setdiff appears not to work for symbolic arrays, as the example illustrates

syms a b c
G{1}    = {a,b,c} 
G{2}    = {a,b} 
setdiff(G{1},G{2})

Is there an alternative way of accomplishing what setdiff should be able to accomplish?

Thanks!

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Answer 1

Subhadra Mahanti 2016-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/267144-comparing-cell-arrays-of-symbolic-variables#answer_209028

编辑：Subhadra Mahanti 2016-2-8

在 MATLAB Online 中打开

isequal(G{1},G{2})

The above code will return if true and 0 otherwise.

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Leo Simon 2016-2-8

Thanks! I actually wanted a command that would return whatever is not in the union of G{1} and G{2}, not just check if they are equal. Obviously setdiff would work if I defined the G's as regular arrays rather than cell arrays, but I need it to works for cells.

Walter Roberson 2016-2-8

在 MATLAB Online 中打开

You do not have symbolic arrays to take the set difference of. {a,b,c} is a cell array each element of which contains one symbol. The symbolic array form would be

G{1} = [a, b, c];

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