Assigning random numbers to an variable

Hello,

I was wondering how to assign random numbers to a varibale that already has numbers. Any help is appreciated

Example: variableX = (1:1:336);

variableY = Assigns a random number to each values of the variableX

Thank you

Answer 1

[Benjamin Thompson]

The rand function is for uniformly distributed random numbers, while randn is for normally distributed random numbers. Both functions accept arguments for the size of the output that you want:

>> A = rand(3,3)

A =

0.8147 0.9134 0.2785

0.9058 0.6324 0.5469

0.1270 0.0975 0.9575

>> B = randn(3,2)

B =

2.7694 0.7254

-1.3499 -0.0631

3.0349 0.7147

You can also overwrite a variable that already exists, so it sounds like you want:

variableX = randn(336,1);

This would overwrite what was in variableX with a new column vector of normally distributed random numbers, where the length of the vector is 336.