Plot Definition and 658 Threads

Hello: I have entered data into two lists in Mathematica: centroidEnergy = {1.3485, 1.4780, 1.6176, 1.7820, 1.9123, 2.0274, 2.1635, 2.3163, 2.4213, 2.5191, 2.6515, \ 2.7490, 2.8763, 2.9894, 3.0728, 3.1949, 3.2816, 3.3923, 3.4773, 3.5884, \ 3.6804, 3.7702, 3.8374, 3.9679, 4.0507...

How do you plot a straight line, parallell to the y-axis in gnuplot? Something like: x = 20 ?

How do I plot a Complex Function like... e^ix? I tried things like... complexplot(x,y); ...but that gets me knowhere. I searched on the program, but it never mentions anything about a Complex Plane of Argand Plane. I would really like to see this graph, which probably looks...

If you were to plot T^2 versus ms using the equation T^2= (4pie^2/k)(ms +mw) how would you calculate the value for mw? can someone please help me? What do they mean by plot T^2 verus ms?

What are the dimensions of a rectangular plot with maxium area if the north and south sides cost twice as much to fence as the east and west sides and if you have $1000 to spend? East and west sides cost $10 per meter to fence.

\int _1 ^{\infty} \frac{1}{x^{1.3}}dx I need to plot this integral and approximations with left and right endpoints using Mathematica. I've tried a google search to get some instructions... but nothing. Does anyone know how to do this? Thank you.

I've been asked to complete electric field E and potential V inside and outside of a simple plate capacitor (the plates are infinitely large and the distance between the two plates is d.) My working is as follows. Inside the cap- E = \frac{ \sigma } { \epsilon_{o} } then potential V=Ed...

Is there any software which can help me plot graphs of mathematical functions i dearly need it for calculating areas in definite integral. :shy: