How to save variables in a TEXT FILE
To save your matlab variables/arrays as ascii text, there are a number of
things you can do. Here are some options in order of increasing difficultly:
- For small matrices, you can use the "diary" command to create a diary file,
and then list the variables on this file. You can then use your text
editor to manipulate the diary file at a later time. The output of the
diary includes the matlab commands used during the session. To turn the
diary on, you simply enter a command of the form:
diary filename
To turn the diary off, just enter the command:
diary off
When using this method, you have some control the output format with
the "format" command. See "help format" for more details.
- You can save variables using the "save" command, with the /ascii option.
For example:
A = rand(4,3);
save temp.dat A /ascii
creates an ASCII file called temp.dat which contains something like:
0.2113 0.8096 0.4832
0.2115 0.7496 0.4483
0.4813 0.5896 0.4383
0.2373 0.5654 0.1934
The format options are limited to either short or long floating point
format with the "save" command.
- Use the "fopen" and "fprintf" commands in Matlab to create your own
custom format. These commands are similar to the ANSI C functions
of the same name, with some extensions. Here is a simple example
from "help fprintf". These statements
>> x = 0:.1:1; y = [x; exp(x)];
>> fid = fopen('exp.txt','w');
>> fprintf(fid,'%6.2f %12.8f\n',y);
create a text file containing a short table of the exponential function:
0.00 1.00000000
0.10 1.10517092
...
1.00 2.71828183
last updated: 7/13/95
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