How to check whether a specific variable is empty or not in table type

Question

Sangmin Lee 2020-4-17

评论： Sangmin Lee 2020-4-17

Hi, please see the follwing figure.

As you can see, in this 'table' type variable, some rows does not have 'ls_max_tone' and some have 'ls_max_tone' .

'ls_max_tone' variable is defined as 'cell' type.

I can find which row has 'ls_max_tone' variable using for loop. However, I know this is not efficient way.

Is there any efficient way such as

T_data(T_data.temperature >50, :)

which returns all rows that temperature value exceeds 50.

Thanks in advance.

Answer 1

Tommy 2020-4-17

T_data(~cellfun(@isempty, T.ls_max_tone),:)

This will return a table containing only the rows where ls_max_tone is not empty.

Sangmin Lee 2020-4-17

Thanks a lot!

I am always having difficulty in using cell array and cell function (@).

It works!