How to store outputs in a vector? - octave

Question

I need to put the outputs of my function into a vector.
In fact my results seems like this:
ans=
result 1
ans=
result2
ans=
result3
......
I need that my result look like this:
Vector= (result1
result2
result3
....)
The head of my function is like this:
function[keys]=generate()
for k=1:257
x= round(rand*9);
vet = x*ones(1,16);
i= round(rand*length(vet));
i(i==0)=1;
val= round(rand*257);
vet(i)=val;
keys=dec2hex (vet)
endfor
endfunction
I would be very grateful if you could help me.

Answer 1

This is, generally speaking, a very vague question.
If the function you are calling returns multiple things you can capture them in a vector like so:
[a, b, c] = myFunc()
If you are calling multiple functions each storing one thing you could do something like this:
vec = []
a = myFunc1()
vec = [vec a]
a = myFunc2()
vec = [vec a]
etc...
or shorter:
vec = [myFunc1() myFunc2() ... ]
It seems as though the ans output you're seeing is a result of the lack of a semi-colon on the line:
dec2hex(vet)
You should save that output into a vector and return that:
function[keys]=generate()
keys = [];
for k=1:257
x= round(rand*9);
vet = x*ones(1,16);
i= round(rand*length(vet));
i(i==0)=1;
val= round(rand*257);
vet(i)=val;
keys = [keys dec2hex(vet)];
endfor % endfor for octave
endfunction

Answer 2

I would omit the for loop and you should use randi if you want to generate random integers, for example for indexing. And I guess you want to split generating of keys and converting them to hex because the hex format is for visualisation. At the end I guess this question suffers from the XY-problem
function keys = generate ()
key_cnt = 5;
key_offset = 9;
key_length = 16;
keys = ones (1, key_length) .* randi (key_offset + 1, key_cnt, 1) - 1;
val = randi (2 ** 8, key_cnt, 1) - 1;
i = randi (key_length, key_cnt, 1);
ind = sub2ind ([key_cnt, key_length], 1:key_cnt, i');
keys (ind) = val;
endfunction
function ret = hex_keys (k)
## convert keys to hex string
for i = 1:rows (k)
ret(i, :) = [sprintf("%02X ",k(i,1:15)), sprintf("%02X",k(i,16))];
endfor
endfunction
k = generate ();
hex_keys (k)
gives
00 00 00 2A 00 00 00 00 00 00 00 00 00 00 00 00
03 03 C7 03 03 03 03 03 03 03 03 03 03 03 03 03
07 07 07 07 07 07 07 07 07 07 07 07 A7 07 07 07
03 03 03 03 03 03 03 8F 03 03 03 03 03 03 03 03
03 03 03 03 03 03 03 03 03 D0 03 03 03 03 03 03
Of course increase key_cnt to 257 if you are finished with testing.

Answer 3

very likely you can wrap your statement to compute ans into either horzcat or vertcat to achieve what you want.