writing bin data to *.dat file
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Lennart
el 21 de Oct. de 2015
Comentada: Star Strider
el 22 de Oct. de 2015
Hey everybody,
again I couldn't find the right solution and need your wise counsel ;)
I have a binary vector i.e. like this: x = rand(50,1)*7; x = fi(x,false,3,0) x = bin(x);
Now I want to write this to a dat file. I acutally thought I could use dlmwrite('test.dat', x, 'newline', 'pc') but if x = [101 ; 110 ; 001 ; 011 ; ...]
the test.dat file looks like this: 1,0,1 1,1,0 0,0,1 0,1,1 . . .
and not like I would like to have it: 101 110 001 011 . . .
Any idea how I can teach dlmwrite to neglect the commas while still using the newline parameter? Should I probably use some other function?
Beste regards and thanks in advance,
Lennart
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Star Strider
el 21 de Oct. de 2015
I don’t have the Fixed Point Designer, so I’m relying on the documentation for bin. The bin function returns a character array, and the dlmwrite function writes only numeric data. So it would seem that you have to convert the string to double-precision numeric, and use the 'precision' name-value pair argument.
See if this does what you want:
x = ['101' ; '110' ; '001' ; '011'];
xn = str2num(x);
dlmwrite('#TEST.txt', xn, 'precision','%03d')
type #TEST.txt
101
110
001
011
You will have to experiment to tweak it to your specifications, but this seems to be as close as dlmwrite can get to doing what you want.
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Star Strider
el 22 de Oct. de 2015
My pleasure!
Yes. The '%3s' format string guarantees a 3-character-wide text field.
If you want all the entries in your file to have a 7 (or larger character field), change the format string to accommodate it, for example '%7s' for a 7-character field. However, the string has to have the requisite number of leading zeros already in the string for that to display as you want it to. If it does not, the field will still be 7 characters long, but right-justified so the left positions are blank.
The '%3s' will accommodate larger fields, but shorter strings will be out of alignment, of varying length but at least 3 characters long. If you want them all in alignment in your file, use '%7s' (or '%8s' to print entire bytes).
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