check with Matlab if object is exsting -

check with Matlab if object is exsting -

matlab code:

for n = 1:length(data) if exist('data{n}.sid') array{n} = data{n}.sid else array{n} = 0 end end

result:

array = [0] [0] [0] [0] [0] [0] [0]

but in first , sec struct of "data", "hk1", resp. "hk1.sid" exists , contains "1"!

how have alter code, array looks this?...

array = [1] [1] [0] [0] [0] [0] [0]

content of data:

>> info info = [1x1 struct] [1x1 struct] [1x1 struct] [1x1 struct] [1x1 struct] [1x1 struct] [1x1 struct] >> data{2} ans = sid: 1 hk1: [1x1 struct] >> data{4} ans = pack_id: [1x1 struct] pack_seq_ctrl: [1x1 struct]

as see, data{2} includes "sid", data{4} doesn't include "sid"...

instead of exist('data{n}.sid'), utilize isstruct(data{n}) && isfield(data{n}, 'sid').

exist attempting check whether variable exists literally called data{n}.sid. that's not valid variable name, returns false , never through status wanted.

matlab