How can I plot the complex formula as follow?

Question

I try for this ...

I want to see the result like this

Plots from web

Plot[(-1.047-1.50133 I)*E^((-0.34381+1.35844 I) t) *(1+ Erf[(0.72714+0.9341 
I)* Sqrt(t))+((-1.047+1.50133 I)*E^((-0.34381-1.35844 I) t)*
1+Erf[(0.72714-0.9341 I)*Sqrt(t))]

Is it supposed that people willing to help will rewrite the formula from an image? — m0nhawk, May 23 '15 at 12:17
Welcome to Mathematica.SE! I hope you will become a regular contributor. To get started, 1) take the introductory Tour now, 2) when you see good questions and answers, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge, 3) remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign, and 4) give help too, by answering questions in your areas of expertise. — bbgodfrey, May 23 '15 at 12:24
As noted by @m0nhawk, please enter your code in the question with Mathematica format. — bbgodfrey, May 23 '15 at 12:25
@m0nhawk yes,because the image is from the http://www.wolframalpha.com/ ,but I want to use Mathematica to show it. I also try the method of "Plotting Complex Quantity Functions " still can't plot it. — Erergo, May 23 '15 at 12:40
@Erergo You should copy and paste textual code into this question, not an image of it. But this is probably also a duplicate. — Mr.Wizard, May 23 '15 at 12:47
@Erergo it's not good for someone to retype that kind of equation. Copy a text. Also, from what I've see, you have a miniscule i, and in Mathematica imaginary unit is a capital I. — m0nhawk, May 23 '15 at 12:49
Two other problems are evident from the image. First e should be E. Second, Plot does not handle complex numbers. — bbgodfrey, May 23 '15 at 12:49
sorry ,I use this web first time,let me learn how to paste the code. — Erergo, May 23 '15 at 12:52
Thank you. I cleaned up the format a bit for you. I am not sure why you got the more complicated output from Mathematica. — Mr.Wizard, May 23 '15 at 13:13

score 0 · Accepted Answer · answered May 23 '15 at 13:16

In seems that your function has an imaginary part of zero for all inputs in range:

expr[t_] := (-1.047 - 1.50133 I)*
   E^((-0.34381 + 1.35844 I) t)*(1 + Erf[(0.72714 + 0.9341 I) *Sqrt[t]]) + (-1.047 + 
     1.50133 I)*E^(( -0.34381 - 1.35844 I) t)*(1 + Erf[(0.72714 - 0.9341  I)*Sqrt[t]])

Table[Im[expr[t]], {t, 0, 15, 0.1}] // Union

{0.}

How can I plot the complex formula as follow?

1 Answers1