Finding structure array entries with certain values

Hello,

What is the way to find all structure array entries with specific values?

E.g. I tried:

 find(cell_data.CN == 4)

But that returns:

 Error using  == 
Too many input arguments.

Kind regards,

Tom

Answer 1

[Jos (10584)]

I assume that celldata is a structure array

% create some example data
  for k=1:10, celldata(k).CN = ceil(4*rand) ; end

% method 1: easy
  allCN = [celldata.CN] % comma separated list expansion 
  tf1 = allCN == 4 
  index1 = find(tf1) 

% method 2: very flexible
  fun = @(x) celldata(x).CN == 4 % useful for complicated fields
  tf2 = arrayfun(fun, 1:numel(celldata))
  index2 = find(tf2)

Both methods can be written as one-liners.

Answer 2

[Thomas]

You could use something like this

 strs={'1' '2' '3' '4'}
 ind=find(ismember(strs,'4'))

 >> ind =
     4

[Tom]

What is strs? I tried replacing strs with cell_data.CN there and got

Error using ismember (line 68) Too many input arguments.

So I don't think I understand properly your suggestion...

[Thomas]

strs in the array of cells.. that I am defining above the find command to give the example..

try

strs ={cel_data.CN};
ind=find(ismember(strs,'4'))