Find row index of first 'True' value in column of table

I have a table (called T) of multiple columns of different types (int & string). One column (called 'active' - last column) is made up of 'True' and 'False' values.

I need to get the row index corresponding to the first instance of a 'True' value in that specific column.

When i subset this column out, using x = T.active; I get a cell containing the True/False strings.

The data looks like this:

0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995400000000	0.320874800000000	-0.243447200000000	-0.391341200000000	3	0.600000000000000	0.300000000000000	'False'	'False'
0.533995200000000	0.320874700000000	-0.243447100000000	-0.391341100000000	3	0.600000000000000	0.300000000000000	'False'	'True'
0.533995300000000	0.320876000000000	-0.243452500000000	-0.391338100000000	3	0.600000000000000	0.300000000000000	'False'	'True'
0.533996300000000	0.320879000000000	-0.243463900000000	-0.391332500000000	3	0.600000000000000	0.300000000000000	'False'	'True'
0.533998800000000	0.320884400000000	-0.243480800000000	-0.391323600000000	3	0.600000000000000	0.300000000000000	'False'	'True'

Answer 1

[Walter Roberson]

[~, idx] = ismember('True', T.active);

It will be 0 if none match.

[Centauri Jolene]

Thank you. This also worked for me:

idx = find(strcmp(T.active, 'True'), 1);

Answer 2

[KSSV]

Let T be your table.

idx = contains(T.active,'True') ; 
iwant = find(idx)
T(idx,:)