can't get ny script running. What could be the problem?

a=4:-1:4;
w=a*randn(350,1);
n = 400000;
proc_1= zeros(1, n);
for i = 1 : n
  if rand() <= 0.5
    proc_1(k) = x1(randi(length(x1)));
  else
    proc_1(k) = x2(randi(length(x2)));
  end
  resultant(k)=proc_1(k)+w(k);
end

i'm running this script but it keeps giving me this error=> " ??? Index exceeds matrix dimensions."

[darova]

WHere is the whole code?

[Optics Wizard]

^I concur. OP, please post the entire code. Or, maybe the answer is that you haven't defined x1 or x2...

Answer 1

[Walter Roberson]

w=a*randn(350,1);

so w is length 350

n = 400000;
for i = 1 : n

so i will go to 400000

resultant(k)=proc_1(k)+w(k);

k is not defined in anything we see, but it could easily exceed 350. Especially if k is intended to be the same as i, in which case proc_1(k) would be valid up to k = 400000 but w(k) is only valid up to k = 350

[Hasan Bravo]

How can i make w(k) valid upto 400000 while not changing the w(k) equation?

[Steven Lord]

You can't retrieve the 400000th element of a vector if the vector doesn't have a 400000th element. You're asking for something that simply does not exist.

[Walter Roberson]

You could "reuse" w values, such as

w(mod(k-1,350)+1)

which would use w in cycles of 350 (that is, k=351 and 701 and 151 would all map to w(1))

But it is not at all clear that that would be desirable.