import ip address in octave - import

Question

I have a dataset that consists of IP addresses packets transferred etc. Octave is converting the IP addresses into float values. How do I import IP addresses as it is and what data type is to be used (String?)?

Answer 1

How do you import them in octave? GNU Octave has plenty of functions to load/save data. It depends how your IP adresses (IPv4 or IPv6?) are stored in your file which function is the easiest/best for you.
For example if you have a file called "ips.txt".
192.168.10.4
8.8.8.8
14.32.244.8
You could use this to get a cell:
octave:1> f = fopen("ips.txt", "r");
octave:2> l = textscan(f, "%s");
octave:3> fclose(f);
octave:4>
octave:4> l{1}
ans =
{
[1,1] = 192.168.10.4
[2,1] = 8.8.8.8
[3,1] = 14.32.244.8
}
octave:5>
But perhaps char(fread(..)) or fgetl may be better for you dependent what you want to do later with the imported ips...
addition:
Because you commented that you have IP addresses are inside a list of floats and not a fixed scheme (a fixed scheme would be for example: "The wanted ips are at the beginning of the line, the 4.th column or somethink like that which could be processed with awk) I also add a possibility with regexp:
I created this file ips.txt:
192.168.10.4 some text 3.14 8.8.8.8
other 123.44 14.32.244.8
4.667.2 12.943 127.0.0.1 hello world
And load it with this script using regexp
f = fopen("ips.txt", "r");
x = char(fread(f));
fclose(f);
[S, E, TE, M, T, NM, SP] = regexp (x', '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}');
which gives you for M:
M =
{
[1,1] = 192.168.10.4
[1,2] = 8.8.8.8
[1,3] = 14.32.244.8
[1,4] = 127.0.0.1
}
-- Andy