How to count field numbers of structure?

Please let me know how to count field numbers of structure as below.

Structure.A = zeros(10); Structure.B = zeros(10); Structure.C = zeros(10);

there are 3 fields in structure, and I want to know number '3'.

[Stephen23]

Use this:

numel(fieldnames(Structure))

[Vincent Hall]

Thanks Stephen Cobeldick, that works nicely.

Answer 1

[KSSV]

length(fieldnames(Structure))

[Jos (10584)]

NUMEL is preferred over LENGTH to get the number of elements.

LENGTH(S) will return the maximum value of SIZE(S), which can or cannot be the same as the number of elements of S ...

[GyuSang]

Thank you for your answer.

[Jan]

@Jos: I've seen many bugs caused by using length too sloppy. In the current case fieldnames replies a cell vector, such that length is trustworthy here.