Extracting table from data structure
조회 수: 2(최근 30일)
I have multile .mat files and from these files I want to extract the table with variable name B (500000×1 double). At first, I have loaded data using S = dir('*.mat'); and then I am using commond K = S.B; to extract the data from table variable name B. This commond doesnot work and gave me this message: Reference to non-existent field 'B'.. Can you guide me which commond will I use to extract the table data from data structure.
Hiro 2021년 4월 6일
First thing you should do is check if S is a table variable.
If it turns out to be a table variable, then the next thing would be running the following command to check if B exists
Steven Lord 2021년 4월 6일
At first, I have loaded data using S = dir('*.mat');
The dir function does not load data. All it does is generate a list of files in the directory with the .mat extension. To load the data you'll need to use the load function. Then if you want to check if the loaded data contains a variable named B (that has been loaded into a field of the output of load you can use isfield.
data = load('census.mat')
doesItHaveAVariableB = isfield(data, 'B')
doesItHaveAVariableCdate = isfield(data, 'cdate')