R[1;-1] how i write the program in matlab for random selection between 1 and -1

need help

Answer 1

[Jan]

V = 1 - 2 * randi([0,1])

or

V = 1 - 2 * (rand >= 0.5)

Answer 2

[Torsten]

x = rand;
if x <= 0.5
  number = 1;
else
  number = -1;
end

Best wishes

Torsten.

Answer 3

[Pawel Jastrzebski]

clear all;
clc;

% use 'random function' of your choice
% - rand()
% - randi()
% - randn()

% GENERATES A RANDOM NUMBER IN A RANGE OF -1 TO 1:
r1 = -1+ 2*rand(1);

% GETS THE SIGN OF THE 'r1'

sVal = sign(r1);

% ALL ABOVE CAN BE DONE IN ONE LINE:

sVal1 = sign(-1+ 2*rand(1));

[Jan]

The sign() function can reply 0 also, if rand replies 0.5.

[Pawel Jastrzebski]

Good point - thanks for correcting.