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How to Convert a column with Char in Cell matrice to Number?

Asked by Vyshakh Pv on 16 Apr 2019
Latest activity Commented on by Vyshakh Pv on 5 May 2019 at 10:37
  • I have a cell array:
A =
'Time' 'Name' 'Location' 'Duration' 'Remarks'
'100' 'John' 'Abc' '1000' 'Nill'
'101' 'Tim' 'Def' '1000' 'Nill'
'102' 'Tom' 'Ghi' '2000' 'Nill'
'103' 'Jim' 'Jkl' '4500' 'Nill'
Here I want to convert A(2:4, 1), and A(2:4, 4) to numbers and save to same matrice A.
I can do this using a LOOP and STR2DOUBLE(), but it is very time consuming when the matrice is very large.
Is there any method to convert a range of char-values in a cell matrice to to numbers?
I am looking for someting like:
A(2:4, 1) = str2double( A(2:4, 1) ) %This command is not working
A(2:4, 4) = str2double( A(2:4, 4) ) %This command is not working
  • Output should look like:
A =
'Time' 'Name' 'Location' 'Duration' 'Remarks'
100 'John' 'Abc' 1000 'Nill'
101 'Tim' 'Def' 1000 'Nill'
102 'Tom' 'Ghi' 2000 'Nill'
103 'Jim' 'Jkl' 4500 'Nill'

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2 Answers

Answer by Stephen Cobeldick on 16 Apr 2019
Edited by Stephen Cobeldick on 16 Apr 2019
 Accepted Answer

You almost got it right, you just need to split the numeric array into a cell array so that it can be allocated back to the cell array A:
A(2:4,1) = num2cell(str2double(A(2:4,1)))
A(2:4,4) = num2cell(str2double(A(2:4,4)))
Or simply on one line:
A(2:4,[1,4]) = num2cell(str2double(A(2:4,[1,4])))

  1 Comment

actually.....
for i = first : last
mat{i, col} = str2double(mat{i, col});
end
is faster than ....
mat(first:end, col) = num2cell(str2double(mat(first:end, col)));

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Answer by KSSV
on 16 Apr 2019
Edited by KSSV
on 16 Apr 2019

A = {'Time' 'Name' 'Location' 'Duration' 'Remarks'
'100' 'John' 'Abc' '1000' 'Nill'
'101' 'Tim' 'Def' '1000' 'Nill'
'102' 'Tom' 'Ghi' '2000' 'Nill'
'103' 'Jim' 'Jkl' '4500' 'Nill'} ;
T = cell2table(A(2:end,:),'VariableNames',A(1,:)) ;
T.(1) = cell2mat(T.(1)) ;
T.(4) = cell2mat(T.(4)) ;
T

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