convert char to double
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Geoff Hayes on 8 Apr 2020
Farshid - try using cellfun. It seems that the pn is a cell array with 38 elements and each element is a 8x1 char array. You haven't mentioned if each of the 8 characters is a single number or if all 8 combine to one (I'll assume the latter).
>> myData = load('example.mat');
>> numericData = cellfun(@(x)str2double(x'), myData.pn);