Evaluates the cosine integral for any real nonnegative number x.


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Inputs/Outputs

  • cdbl.png x —

    x is any real nonnegative number. If x is negative, the VI uses the absolute value of x.

  • idbl.png Ci(x) —

    Ci(x) is the result of the calculation of the cosine integral for the given value of x.

    • The following equation defines the cosine integral.

    where Ci is the cosine integral and γ is the Euler constant.

    The following illustration shows the graph of the cosine integral in the interval (0, 15).