expint not functioning as expected?

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J
J 2011-3-29
Hi all,
I am trying to use expint in a routine I am coding, however it doesn't seem to be working as I expect it to. I expect it to function as shown by the link below
http://mathworld.wolfram.com/ExponentialIntegral.html
With the output starting negative then becoming positive around 0.372. Have I misunderstood what this function does?
I am using the command below to check output:
>> plot(expint(0:0.01:1.5))
Thanks,
J

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采纳的回答

Matt Fig
Matt Fig 2011-3-29
I think perhaps you are looking for this:
Ei = @(x)real(-expint(-x));
x = -2:0.001:3;
plot(x,Ei(x))
  2 个评论
J
J 2011-3-29
So effectively I was just assuming to see the real part of the answer? Just me being stupid again then...
Matt Fig
Matt Fig 2011-3-29
You probably confused one definition of the exponential integral for the other. Read the doc for EXPINT carefully.

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