Write both strings and numbers to a file?

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Kevin Bachovchin 2014-6-5

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评论： Image Analyst 2014-6-6

Hello,

Is it possible using fprintf or another function to write both an array of strings and numerical values to a file? I would like to write the variables names as well as their numeric values.

Thank you, Kevin

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Answer 1

José-Luis 2014-6-5

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在 MATLAB Online 中打开

Yes you can:

 s = 'I am a string';
 n = pi();
 fprintf(1,'%s %f',s,n); %Replace 1 with an actual fid

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Kevin Bachovchin 2014-6-6

That works, but what would I do if I didn't know the number of elements in alphabet?

Image Analyst 2014-6-6

在 MATLAB Online 中打开

That won't happen. You will know the name of your variable. If your variable name itself is variable, and stored in a variable, like your variable name is myVariableName, and sometimes that will contain the string 'alphabet' and other times it might contain 'starTrek' and other times it might be 'starWars', then treat it just as an ordinary string

fprintf(fid,'%s %f %f %f %f %f', myVariableName, numeric)

so you'll see starTrek, alphabet, or starWars depending on what happened to be inside the string. But you will and must know that the variable is called myVariableName, otherwise how can you possibly tell it what to write out?

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Answer 2

Star Strider 2014-6-5

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If you are exchanging files with someone else who is using MATLAB, use a mat-file. They are easy to use, binary, so are smaller, and do not need formats to write or read. They also associate the variables with their values, and when the files are opened, the variables and values (string, symbolic, numeric, cell) are automatically loaded into the workspace of the function calling them.

See matfile and associated functions for details.