finding index to a vector in structure

2015 10 1
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更新时间：2015 10 1
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Consider the following example:
f = struct
f(1).x = 5;
f(2).x = 1:10;
f(3).x = 1;
f(4).x = 2;
I wish to find an automated way of finding which element of the field x is a vector. In the example above, the answer is element 2. Thank you!

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the cyclist
the cyclist 2015-10-1

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I could not figure out a vectorize way to do this, but perhaps this loop is good enough:
n = size(f,2);
isVectorF = false(1,n);
for nv = 1:n,
isVectorF(nv) = not(isscalar(f(nv).x));
end
isVectorF is a logical with 0 = scalar and 1 = vector.

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