Error inside the function,"Struct contents reference from a non-struct array object"?

Error in split_train_test (line 11)  idx_label = find(dataset.label == i);

tr_num = 240;
field = 'label';
value = {tottrainlabel};
dataset = struct(field,value);
class_num = length(unique(dataset.label));

fr_dat_split = split_train_test(F, tr_num,class_num);

function dataset_split = split_train_test(dataset, tr_num, class_num)

if nargin < 3
  class_num = length(unique(dataset.label));
end

tr_idx = [];
tt_idx = [];

for i = 1 : class_num
    idx_label = find(dataset.label == i);
    num = length(idx_label);    
    idx_rand = randperm(num);

      tr_idx = [tr_idx idx_label(idx_rand(1 : tr_num))];
      tt_idx = [tt_idx idx_label(idx_rand(tr_num+1 : end))];
  end

Answer 1

[Walter Roberson]

Your call

fr_dat_split = split_train_test(F, tr_num, class_num);

is not passing the dataset into the function: it is passing some other variable, F instead. F is not a structure, whatever it is.

[arun]

I made the changes you told, but the function produces another error

Index exceeds matrix dimensions.

Error in split_train_test (line 15)
    tr_idx = [tr_idx idx_label(idx_rand(1 : tr_num))];

[Walter Roberson]

Some of your classes do not have as many as 240 samples.