MATLAB: Normrnd function not working

MATLABmatlab function

I tried the following examples:
    n1 = normrnd(1:6,1./(1:6))
    n2 = normrnd(0,1,[1 5])
    n3 = normrnd([1 2 3;4 5 6],0.1,2,3)
I only get the following console output:
>> n1 = normrnd(1:6,1./(1:6))
Undefined function 'normrnd' for input arguments of type 'double'.
>> n2 = normrnd(0,1,[1 5])
Undefined function 'normrnd' for input arguments of type 'double'.
>> n3 = normrnd([1 2 3;4 5 6],0.1,2,3)
Undefined function 'normrnd' for input arguments of type 'double'.
I have only signal processing toolbox, and plain matlab. If I type:
edit normrnd
The normrnd.m opens up normally.
What is the problem?

Best Answer

The normrnd function is in the Statistics and Machine Learning Toolbox. You must have it downloaded and installed to have access to its functions.
You can do essentially the same with the built-in MATLAB function randn:
n1 = (1:6) + randn(1,6)./(1:6);
Here, you add the desired mean, and multiply by the desired standard deviation.
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