problem in plotting the logarithmic integral

Good Evening to everybody.

I have a serious problem. I'm using Matlab, and I am not be able to plot the Logarithmic Integral, logint or LI(x). Matlab do not recognize the command or the input, and I don't know how to do.

For example if I write

x = linspace(0, 10); y = cosint(x); plot(x,y)

it's all ok.

But if I try to write logint(x) or Li(x) or whatever else.. nothing. Error.

What's the problem?

Thank you very much to everybody

Answer 1

[Star Strider]

It’s in the Symbolic Math Toolbox as logint. There is also a MuPAD version as Li. I can’t find documentation for any others, although searching the File Exchange for logarithmic integral might be an option.