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saurabh.sama
Member Posts: **1**

in Matlab

guys,

i have to evaluate surface area.. the surface looks like a quadraticsurface on x-y plane . i broke the whole curve in 3 parts and performed curve fitting on it. after this the part of the curve in positive x direction is revolved around the y axis creating a paraboloid type of surface(Note: the axis of fitted parabola is diff from the y axis so the curve will differ in positive x direction from negative x direction)

now this is how i m trying to evaluate the surface area of the surface i generated.

this is d code i was using to findout the surface integral

syms r theta

x=2.515251898 + r*cos(theta) ;

z=2.515251898 + r*sin(theta) ;

y= (x.^2 + z.^2 )*0.0152151093240165

R=[x y z]

Ru = diff(R,r)

Rv = diff(R,theta)

g = cross(Ru,Rv)

ro=0

rf = 30.0499755714919

t= g(1)^2 +g(2)^2 +g(3)^2

S = int(int(sqrt(t), r,ro,rf), theta,0,pi());

pretty(S)

eval(S)

the problem is it is not able to evaluate the surface integral.. it's giving errors

Warning: Explicit integral could not be found.

is their any other way to evaluate the surface area or if there is any problem in coding please help me out

i have to evaluate surface area.. the surface looks like a quadraticsurface on x-y plane . i broke the whole curve in 3 parts and performed curve fitting on it. after this the part of the curve in positive x direction is revolved around the y axis creating a paraboloid type of surface(Note: the axis of fitted parabola is diff from the y axis so the curve will differ in positive x direction from negative x direction)

now this is how i m trying to evaluate the surface area of the surface i generated.

this is d code i was using to findout the surface integral

syms r theta

x=2.515251898 + r*cos(theta) ;

z=2.515251898 + r*sin(theta) ;

y= (x.^2 + z.^2 )*0.0152151093240165

R=[x y z]

Ru = diff(R,r)

Rv = diff(R,theta)

g = cross(Ru,Rv)

ro=0

rf = 30.0499755714919

t= g(1)^2 +g(2)^2 +g(3)^2

S = int(int(sqrt(t), r,ro,rf), theta,0,pi());

pretty(S)

eval(S)

the problem is it is not able to evaluate the surface integral.. it's giving errors

Warning: Explicit integral could not be found.

is their any other way to evaluate the surface area or if there is any problem in coding please help me out

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