0
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Manipulate[
    Plot[PDF[NormalDistribution[mu, sigma], x], {x, -4*sigma, 4*sigma}],
    {mu, -10, 10}, {sigma, 0, 10}
]

I got the following error:

enter image description here

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2
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For the code to work without error messages, signa needs an initial value, for instance:

Manipulate[Plot[PDF[NormalDistribution[mu, sigma], x], {x, -4*sigma, 
   4*sigma}], {mu, -10, 10}, {{sigma, .5}, 0, 10}]

Alternatively, just tolerate the initial error messages, and move the sigma slider to obtain the desired results.

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  • $\begingroup$ Thanks. I just realized that it's stupid mistake. Sigma should be >0. $\endgroup$ – Chen Stats Yu May 21 '15 at 17:30
  • 1
    $\begingroup$ Or, if you don't care too much about the error (like if this is going to some other user, who might try any input, including illegal values), using Quiet[ ] around the body of Manipulate might be a safer option. You can also set specific errors/wranings to eliminate. $\endgroup$ – Bichoy May 22 '15 at 2:57

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