Efficient code - Get rid of my loop

Question

jlt199 2016-8-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/300222-efficient-code-get-rid-of-my-loop

评论： Azzi Abdelmalek 2016-8-19

Hi,

I'm reading in some data from a csv file, which for some reason is being read in as strings rather than doubles. Now I need to do some math so need to convert to numbers, but my strings don't all have the same number of characters. Here's an example:

B = {'5085';'10955';'6496';'6497';'2953';'5090'};

The only way I have found to convert this is to use a loop:

for count = 1:size(B,1)
  B{count} = str2num(B{count});
end
B = cell2mat(B);

But there must be a more efficient, quicker, method for achieving this conversion. Any suggestions please?

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Answer 1

Star Strider 2016-8-19

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/300222-efficient-code-get-rid-of-my-loop#answer_232289

在 MATLAB Online 中打开

The cellfun function works without the loop:

B = {'5085';'10955';'6496';'6497';'2953';'5090'};
Bn = cellfun(@str2num, B)
Bn =
        5085
       10955
        6496
        6497
        2953
        5090