Step.1: Reading values from the excel sheet (see attachment).
[num,txt,raw] = xlsread('imag_real.xlsx')
Step.2: Apply a str2double to each cell of a cell array i.e. raw
data = cellfun(@str2double,raw)
Step.3: Storing real values to a and imaginary values to b
a = real(data);b = imag(data);
