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How can I convert data in format cell to double?

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Xinyuan Wei
Xinyuan Wei 2016-6-20
回答： Xinyuan Wei 2016-6-21
How can I conver the data in format cell attached here to double? I tried function double. It works well for some of my data but not this file. I cannot not understand what is the difference.

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采纳的回答

Star Strider
Star Strider 2016-6-20
You have to reference ‘G3’ specifically, then convert it.
This works:
d = load('Xinyuan Wei X.mat');
X = d.X;
G3 = X.G3; % Define ‘G3’
G3_dbl = str2num(cell2mat(G3)); % Convert ‘G3’ To Double
This is quite definitely not obvious! I had to experiment with it to get it to a double array.
  2 个评论
Guillaume
Guillaume 2016-6-20
I would advise against str2num as this evaluate arbitrary expressions in the string (including ones that wipe the hard drive!).
G3_dbl = str2double(G3);
is simpler anyway (does not need cell2mat)
Star Strider
Star Strider 2016-6-20
Excellent point!
Thank you for the clarification. I didn’t consider that.
(I always read your and Andrei Bobrov’s Answers and Comments because I learn so much from them. Thank you for your continuing contributions to MATLAB Answers.)

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更多回答（3 个）

KSSV
KSSV 2016-6-20
It is because..if you see your first dataset in X it is 'G3'. As it is a string, MATLAB is showing error to convert to double. You delete the first dataset 'G3' then double shall work.
Shameer Parmar
Shameer Parmar 2016-6-20
As the 'X' is in dataset format, so you need to create new variable by fetching data for 'X'.
first load your .mat file, then run the following code..
for i = 1: length(X)
x(i) = str2num(X{i,1});
end
x = x';
Xinyuan Wei
Xinyuan Wei 2016-6-21
Thank you so much for all your help.

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