could the function expint() use symbol as parameter?

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wjp
wjp 2013-5-10
hi, I use expint() in my code, but the parameter is a symbol. matlab give me errors like this:
Error using expint (line 34) Inputs must be floats, namely single or double.
I seach expint in http://www.mathworks.cn/ and find that the expint can accept symbol as input paramter of matlab R2013a. But my matlab version is R2011b.

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