Character string to numeric vector

Dear all

I am extracting from a file in a for loop information in the following form: ' ( 0.0357 -0.0001 0.0051) ', which is a 1x27 char. I would like to store the three displayed numbers in a the three components of an array so I can use these figures to do mathematical operations. How could I transform them to do so in this case, keeping the minus signs that can appear for different steps of the for loop too?

[Stephen23]

@Richard Wood: please upload an unaltered sample data file by clicking the paperclip button.

Answer 1

[Stephen23]

txt = ' ( 0.0357 -0.0001  0.0051) '

txt = ' ( 0.0357 -0.0001  0.0051) '

vec = sscanf(txt(3:end),'%f',[1,3])

vec = 1×3

0.0357 -0.0001 0.0051

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or

vec = sscanf(strtrim(txt),'(%f%f%f',[1,3])

vec = 1×3

0.0357 -0.0001 0.0051

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Answer 2

[Sameer]

Hi Richard,

To extract the numbers from the string and store them in an array, you can use the "sscanf" function

Here's how you can do it:

% Example string
str = ' ( 0.0357 -0.0001  0.0051) ';

% Use sscanf to extract the numbers
numbers = sscanf(str, ' ( %f %f %f) ');

disp(numbers);

Please refer to the below MathWorks documentation link:

https://www.mathworks.com/help/matlab/ref/string.sscanf.html

Hope this helps!