MATLAB: Assess the xlread in elsefi command

elseifxlread

xlread is used to read xls files i want to use this command in ifelse condiations
if input==a
B=AS
elseif
B=AQ
it means that xlread the column AS
how i generate the code for above algorithm
columnB = xlsread(filename,'B:B')
[EDITED, Jan, please format the code properly, thanks]

Best Answer

if strcmp(in, 'a')
B = 'AS';
else % not elseif
B = 'AQ';
end
columnB = xlsread(filename, [B, ':', B]);