Maximize Storage with Matlab Diary Function | Txt File Limit Solution"

[jemma]

I am using the diary function to store simulation results into a txt file, e.g.

diary('TextLog.txt')

however I expect to have around 50,000 rows of data and so not all my data will be stored. Is there anything I can do to specify the size of the file? Am I right in thinking the file will only hold what is displayed in the Command Window? If so, is there a way to change this? Unless there is a different command I can use? Thanks if you can help!

 

[Dr Transport]

how about writing your data to a file, no size limits...

 

[jemma]

Yes thanks, I've been trying to do this using fprintf.

With the example here: http://www.mathworks.com/help/techdoc/ref/fprintf.html

B = [8.8 7.7 ; ...
8800 7700];
fprintf('X is %4.2f meters or %8.3f mm\n', 9.9, 9900, B)
MATLAB displays:

X is 9.90 meters or 9900.000 mm
X is 8.80 meters or 8800.000 mm
X is 7.70 meters or 7700.000 mm

What does the %4.2f and %8.3f do apart from rounding values to 2 and 3 decimal places respectively? i.e. what's the 4 and 8?
Thanks!

 

[jhae2.718]

The 4 and 8 specify the width of the printed output. So, for %8.3f, if you has 12.345, it would print:

  12.345

and if you had 0.1236 it would print:

   0.124

padding with whitespace so that the column width is 8.

Try this code to see how that works:

number = 12.3456789;
[COLOR="Blue"]for[/COLOR] i=1:10;
    format = sprintf([COLOR="DarkOrchid"]'%%%i.3f\n'[/COLOR], i);
    fprintf(format, number);
[COLOR="blue"]end[/COLOR]

It should produce:

12.346
12.346
12.346
12.346
12.346
12.346
 12.346
  12.346
   12.346
    12.346

• Field width

Minimum number of characters to print. Can be a number, or an asterisk (*) to refer to an argument in the input list. For example, the input list ('%12d', intmax) is equivalent to ('%*d', 12, intmax).

 

[alphy]

I would suggest using the "dlmwrite" function in Matlab to specify the size of the file and ensure that all data is stored. This function allows you to specify the delimiter, which can be a comma, tab, or space, and also the precision of the data. Additionally, you can use the "fclose" function to close the file and ensure that all data is saved before opening it again. Alternatively, you could also use the "save" function to save your data in a .mat file, which can hold larger amounts of data compared to a text file. I would also recommend checking the documentation for the diary function to see if there are any options for increasing the size of the file.