How to index this structure

So I have a structure with lots of fields and corresponding values. So for instance if I want to find the indexes for a range of 100-150 how would I do this? The find function doesn't seem to work for a vector: Select_struct=find([file.Position]==100:150)

Answer 1

[Adam]

[~,matchingIdx] = ismember( [file.Position], 100:150 );

or

[~,matchingIdx] = ismember( 100:150, [file.Position] );

depending which way round you want the indices.