array counting in not happening

numbers_to_extract_normal=[278,199,241,235,35,77,82,164,239,170];

numbers_to_extract_diagnosed = [139,137,136,135,133,140,141,116,157,188];

normal = 0;

diagnosed =0 ;

digits_normal = numel(num2str(numbers_to_extract_normal(i)));

Error: Array indices must be positive integers or logical values.

please help me

Answer 1

[Jan]

The variable i is not defined. If you omit it, num2str() replies a cell array and numel does not work directly. With cellfun():

digits_normal = cellfun('length', num2str(numbers_to_extract_normal));

Converting the numbers to char vectors only to count the number of digits is not efficient. Smarter:

digits_normal = floor(log10(numbers_to_extract_normal)) + 1;

[Rajib Panja]

thank you sir

Answer 2

[DGM]

Your index i isn't valid because it's a complex number.

i = sqrt(-1);

This is a good example of why you shouldn't be using i or j as iterators or indices.

This should also be a lesson in actually defining your variables before you use them.