how can i read values from text file?

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cemsi888 2015-1-27

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评论： Stephen23 2015-1-27

Good morning everyone. New day and one more Question too. It is about again read from text files. I take datas from device as a text file. In first Picture you see that i defined Parameters as a structure which are in s Matrix. The next step that i should do is: under these Parameters there are too many value that each column belong to one Parameter. First question how can i read values from text file (be careful there are semicoluns too)and than after i read how can i connect this numbers with Parameters.

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cemsi888 2015-1-27

and the values start from 230.th row

Stephen23 2015-1-27

You use the format specifier '%s' to read numeric data: why not just convert this immediately to numeric using the '%f' specifier, as all of your data seems to be floating point values.

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Answer 1

Stephen23 2015-1-27

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编辑：Stephen23 2015-1-27

Do not do this. Dynamically assigning variable names is a really bad idea in MATLAB:

http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

http://www.mathworks.com/matlabcentral/answers/56124-eval-is-evil-using-variables-created-dynamically-info-retrieval

http://www.mathworks.com/matlabcentral/answers/51946-systematic-do-not-use-global-don-t-use-eval

http://www.mathworks.com/matlabcentral/answers/79281-create-a-structure-name-based-on-the-string-of-a-variable-create-fieldnames-in-this-structure

The best alternatives are to keep your data in an array (e.g. as they are returned from your file-reading function), or if you require key-value access to your data then use a structure . Structures do allow dynamic fieldnames , and this is much more robust than dynamic variables.

If you have a newer version of matlab you can also use a table , which stores the data together in one array but also allows key-name access to the columns.

Summary: use a structure or table to store your data.