As an addition to Jordan's answer below, it would be a little simpler if you just use logicals rather than strings if you only have two options i.e.
Stokes = true;
Wind = true;
Flow = false;
If you have a lot of cases then I would imagine working with logicals and logical indexing would be faster than string comparisons.
Better still, you could just put them all into an array, either just using two arrays that you keep track of yourself to ensure they are in sync. Also, if you can, use function handles rather than strings for their names if you can, e.g (the 'x' in the Flow is just to give an example of a function handle with arguments).
funcs = { @Stokes, @Wind, @(x) Flow(x) }
toRun = [true, true, false];
or you could use a map, e.g.:
map = containers.Map( { 'Stokes'; 'Wind'; 'Flow'} , { {@Stokes, true}, {@Wind, true}, {@(x) Flow(x), false } } );
Then index into this using your string names as normal and extract both the function handle and the logical, or you could just leave out the function handle there and do that part exactly as Jordan suggests.
