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## sine wave equations

**From**: |
MICHAEL FORREST |

**Subject**: |
sine wave equations |

**Date**: |
Sat, 02 Dec 2006 16:31:16 +0000 |

Dear all,

`I am using NEURON simulation package, a tool for simulating Neurons. In the
``simulation I am currently building I am using sine wave equations. And the
``sine wave plots look somewhat corrupted. Not all the waves are of the same
``shape etc. Now, there must be loads of people on this list that know these
``sine equations backwards. So, I write to kindly ask if my equations are OK.
``I write because my NEURON simulation is not working as desired - and a fault
``in the sine wave equations is one candidate. I have already done a little
``check myself by using an online plotting applet to see what their plot looks
``like. ANd it looks fine! So I write to this list as an extra check.
`

`2 one dimensional sine wave equations 180 degrees out of phase (with an
``offset, D, for each, that ensures the centre is non-zero. So that we dont
``ever have negative values).
`
y(x) = A*sin(((2*PI*x)/lambda)-0) + D
where A = D
y(x) = A*sin(((2*PI*x)/lambda)-PI) + D
where A = D

`Now, I have tried these alternative equations as well. These form corrupted
``sine waves as well:
`
y(x) = A*sin(((360*x)/lambda)-0) + D
where A = D
y(x) = A*sin(((360*x)/lambda)-180) + D
where A = D

`For anyone that wants to go deeper into my problem (though this would
``require some neuroscience knowledge) there is a running thread on it at this
``forum (NEURON forum hosted at Yale):
`
https://www.neuron.yale.edu/phpBB2/viewtopic.php?p=2312#2312
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**sine wave equations**,
*MICHAEL FORREST* **<=**