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problem in plotting the logarithmic integral

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Henry
Henry 2014-9-9
回答： Star Strider 2014-9-9
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

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回答（1 个）

Star Strider
Star Strider 2014-9-9
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.

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