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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?
 2 years ago
 2 years ago
Frostbite Group Title
Any good techniques to plot a function of two variables by hand  or how do we do it anyway?
 2 years ago
 2 years 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.
 2 years 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)
 2 years ago

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

Frostbite Group TitleBest ResponseYou've already chosen the best response.0
surfaces yea
 2 years 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
 2 years 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.
 2 years 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)
 2 years 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
 2 years ago

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

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

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

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