hi, can i get random no. in specific range ?
between 19 , -19
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You didn't read the help on rand(), did you? If you had, you would have seen the answer to your question as the very first example:
Example 1 Generate values from the uniform distribution on the interval [a, b]: r = a + (b-a).*rand(100,1);
Needless to say, a=-19 and b = 19 in your case, and 100 is the number of random numbers to be generated, or:
r = -19 + 38 .* rand(100, 1);
Depending on whether you want to draw from a discrete or a continuous distribution, you will likely want to use either the randi() or unifrnd() function.
As Sean Lawson said in the above comment, using -19+38*rand will generate a random real number in the range (-19 19)
to generate random integers use
randi ([lower_limit upper_limit],a,b,c...)
which generates an axbxcx..... random integer array in the range (lower_limit upper_limit)