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Frostbite
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Any good techniques to plot a function of two variables by hand  or how do we do it anyway?
 one year ago
 one year ago
Frostbite Group Title
Any good techniques to plot a function of two variables by hand  or how do we do it anyway?
 one year ago
 one year ago

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klimenkov Group TitleBest ResponseYou've already chosen the best response.1
The general way is to plot many different points that satisfy your equation and then to draw a curve through them.
 one year ago

Frostbite Group TitleBest ResponseYou've already chosen the best response.0
Well i am reading in my math book "Functions of Several Variables" trying to figure out what they mean, but find it quite hard. They constantly refure to something called outlines and contours (don't know if it is called outlines but best translation i can do so far)
 one year ago

klimenkov Group TitleBest ResponseYou've already chosen the best response.1
Oh, may be you are asking about surfaces.. I thought about equation \(F(x,y)=0\).
 one year ago

Frostbite Group TitleBest ResponseYou've already chosen the best response.0
surfaces yea
 one year ago

JakeV8 Group TitleBest ResponseYou've already chosen the best response.0
you can hold one of the 3 variables constant and plot the remaining 2variable equation... such as a y = mx + b line, with z or f(x,y) held constant is like looking at the edge of the plane that would occur if you extended that line into the 3rd dimension
 one year ago

JakeV8 Group TitleBest ResponseYou've already chosen the best response.0
or a parabola on an xy plane would extend into a "trough" shape when you extend it. More complicated functions in 2 variables are not simple 2 dimensional curves extended into 3 dimensional space, though.
 one year ago

Frostbite Group TitleBest ResponseYou've already chosen the best response.0
Still i find it quite hard to see how they come up with this (see attachment)
 one year ago

Frostbite Group TitleBest ResponseYou've already chosen the best response.0
that is the function f(x,y)=x^2xy+y by the way
 one year ago

JakeV8 Group TitleBest ResponseYou've already chosen the best response.0
ouch... hurts my brain!
 one year ago

JakeV8 Group TitleBest ResponseYou've already chosen the best response.0
I am not sure how to generate those graphs easily by hand... sorry!
 one year ago

klimenkov Group TitleBest ResponseYou've already chosen the best response.1
dw:1349108764775:dw
 one year ago

Frostbite Group TitleBest ResponseYou've already chosen the best response.0
Well thanks for trying. might just be a nutt to crack and then you can do it everytime.
 one year ago

klimenkov Group TitleBest ResponseYou've already chosen the best response.1
Try to write it like this \(f(x,y)=x^2+y(1x)\). Let x be a constant and draw a line in a plane x=const. Do this several times. Next let y=const and then try to find out what you've got.
 one year ago

Frostbite Group TitleBest ResponseYou've already chosen the best response.0
Yea okay i have it on a sketch infront of me  i think.
 one year ago

klimenkov Group TitleBest ResponseYou've already chosen the best response.1
Why do you need to draw it?
 one year ago

klimenkov Group TitleBest ResponseYou've already chosen the best response.1
Can you send a photo of what you've got?
 one year ago
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