1. The problem statement, all variables and given/known data
I have 1.805cos(2pi / 12.165x) +3.125 as the function of tidal data. However I need to use another function, superimpose, to more accurately graph the data for the tides. And yeah I'm pretty lost... Does the next function have to be something to do wit the moon and its rotation around earth?
And help would be greatly appreciated :)
HallsofIvy
Aug21-08, 07:06 AM
I have no idea what you are asking! Why is that not accurate? What do you mean by "superimpose" another function?
flyinghigh
Aug21-08, 07:09 AM
Sorry, should of explained that to find a more accurate representation of the tide, you use the sum of two cosine functions, which is also known as superposition. So yeah, the tide is represented by y1+y2, where y1=the above function, y2=??...
HallsofIvy
Aug21-08, 07:15 AM
that obviously depends upon the data!
flyinghigh
Aug21-08, 07:20 AM
Well then what area of the data? Since I already have the first function that takes into account the tide heights and occurence, what else is required? That's why I asked if it was based on the moon's orbit etc.
flyinghigh
Aug22-08, 05:29 AM
Anyone have any advice?
Defennder
Aug22-08, 09:01 AM
I have 1.805cos(2pi / 12.165x) +3.125 as the function of tidal data. However I need to use another function, superimpose, to more accurately graph the data for the tides. And yeah I'm pretty lost... Does the next function have to be something to do wit the moon and its rotation around earth?You have to be more explicit. What does that mean? What is x? What are you trying to show?
flyinghigh
Aug22-08, 10:37 PM
You have to be more explicit. What does that mean? What is x? What are you trying to show?
1.805 is the amplitude of the waves, as in the average difference between the high tide and the low tide. 2pi/12.165x is the period of the tide, as in how frequently it occurs. 3.125 is the average water height and hence the vertical phase shift of the function. So then I need another function in the same form, as in y=Acos(Bx-C)+D, that I then add to my function.
I'm trying to show, more accurately, tidal data. I think the second function has to be something to do with the moon and it's effects on certain tides? But yeah anyone who know's what they're talking about please help!