How to use expint in Matlab for two argument?

Hello,

I check the help documment: http://www.mathworks.com/help/symbolic/expint.html There are introduction about two argument expint. But i get error "Error using expint Too many input arguments." when i conduct "expint(n,x)" in Matlab R2003a. I don't know why.

Thank,

Rain

Answer 1

[Azzi Abdelmalek]

Try

double(expint(4,sym(3)))

[selin]

Hello, I also have a question about this. Does 4 correspond to n and sym(3) correspond to the power of x in the denominator? I asked a question in https://www.mathworks.com/matlabcentral/answers/329103-expint-function-with-two-arguments?s_tid=srchtitle

I would appreciate so much if you could help me about this! Thank you!