Import worksheet in excel

Hi all, I have a little problem. I have a file in Excel and import to Matlab:

lab= {'9.4', '9.2_1','9.2_2','9.2_3','9.2_4','9.2_5','8.1','8.2_1','8.2_2'};
K = length(lab);  
 for c = 1:K    
[ndata, text, alldata] = xlsread('test.xls',lab{c});
 end

I don't know how I solve the problem when in Excel is not sheet (eg. '8.2_1')

Thank you

Answer 1

[Matt Tearle]

[~,sheets] = xlsfinfo('test.xls')

Then compare sheets to lab using set operations (eg ismember or intersect)