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Thread: Plotting graph

  1. #1
    Senior Member Vinod's Avatar
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    Plotting graph

    Hello,
    How to plot graph of y=x! in r along with all the points between x! and (x+1)!? For example If i want to know 5.2!, I should know it by seeing the graph. (5.2!=169.406099462)
    Last edited by Vinod; Oct 6th 2018 at 05:36 AM.
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  2. #2
    MHF Contributor

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    Re: Plotting graph

    Quote Originally Posted by Vinod View Post
    Hello,
    How to plot graph of y=x! in r?
    Please clarify the notation. What is $x!~?$ Is that simply a punctuation or what is it a factorial?
    What does "in r" mean?
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  3. #3
    Senior Member Vinod's Avatar
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    Re: Plotting graph

    Quote Originally Posted by Plato View Post
    Please clarify the notation. What is $x!~?$ Is that simply a punctuation or what is it a factorial?
    What does "in r" mean?
    Hello, It means x factorial. "r" means r software.
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  4. #4
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    Re: Plotting graph

    Strictly speaking, x! is only defined for x a non-negative integer. To extend to non-integer values you should use the "gamma function": $\displaystyle \Gamma(x)= \int_0^\ifty z^{x- 1}e^{-z}dz$. For n a positive integer, $\displaystyle \Gamma(n)= (n- 1)!$. The gamma function is still not defined for x a negative integer but is defined for all other numbers.
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