How to write a matrix into a txt file so that all variables in a columns have exactly the same starting character and length?

2011 4 21
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I am trying to export a matrix into a text file. The text file will later be feed into another program that requires all variables in a specific columns have the same starting location, and the same length.
How should I achieve this? Which Matlab function should I use to export the data?
Thank you.

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Fangjun Jiang
Fangjun Jiang 2011-4-21

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use sprintf formating, such as
a=rand(5,1);
sprintf('%20.2f\n',a(:));
doc sprintf
It also applies to fprintf.

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Liqing
Liqing 2011-4-21
Thank you very much for the suggestion. So for sprintf I will have to write one row at one time?
Walter Roberson
Walter Roberson 2011-4-21
No, sprintf() and fprintf() will repeat the format as often as needed to write out all the data.

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Liqing
Liqing 2011-4-21

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Now it is working. Thank you very much.
Another question. Now the deliminator is space, so that length of each row is very different. For example, in a column, '45' will have different length as '-45", '26.7', will have different length as '126.8'.
How could I fix this?
Fangjun Jiang
Fangjun Jiang 2011-4-25

0 个投票

What do you mean? What exact format do you want to achieve? Please read through the document of sprintf formatting. I think it should be able to cover most if not all format.
Is this what you need?
sprintf('%010.2f\n',45,-45,26.7,126.8)

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