creating a frame

Hi

Want to clarify a simple doubt I have, which was posted earlier, but had not got a reply.

Does

a = randn(20,20)
imshow(a, [ ])

create a frame with 20x20 pixel, size of each pixel being 1x1, the values of the pixels are Gaussian and the intensity(values of the pixels) are gray linear scale?

Does

a = 3*randn(20,20)
imshow(a, [ ])

create a frame with the same specifications, now that the values are Gaussian with a standard deviation of '3'??

Awaiting your advice

Cheers

P

Answer 1

[Walter Roberson]

No, and No.

randn() cannot produce numbers beyond +/- realmax. No fixed finite range of numbers can have a gaussian distribution. A gaussian distribution has an infinite tail, always.

[PChoppala]

Well, can you please advise what I should use?

I was assuming randn gives uniformly distributed numbers...to be Gaussian.

Anyway, can you help me to get a frame with the above specifications?