How to draw a density function?

Suppose I have :

x = 1-2 frequency 5 probability 1/2 x= 2-4 frequency 3 probability 3/10 x = 4-6 frequency 2 probability 2/10

and I want to draw it... how can I do it?

Answer 1

[Youssef Khmou]

hi,

you mean probability density function ?

 try :
 doc pdf

For example, you want to draw the Normal PDF over the range [-10:10] with N(0,1):

 x=-10:0.1:10;
 Y=pdf('norm',x,0,1);
 figure, plot(x,Y), title(' Normal distribution N(0,1)');

'pdf' function can draw up to 23 distributions,

Answer 2

[Wayne King]

This appears to be a simple discrete random variable with a probability mass function. The problem is that in that case, you cannot have assignments like 1-2, 2-4

The outcome 2 cannot be assigned two different probabilities: 5/10 and 3/10.

Further, this cannot be a distribution with probability assigned to the intervals you give with discontinuities at the interval endpoints because that would not yield a valid probability density function. The total measure (integral) of those step functions would exceed 1.

Here is a valid probability mass function. I'll just assign the probability at the midpoint of the interval (but that may not be correct for your case)

x = [1.5 3 5];
y = [1/2 3/10 2/10];
bar(x,y)