[mathcad] 3d graphs for random functions

Author: =?iso-8859-2?Q?Damian_Ga=B3=EAziowski?= Posted: Wed, 2 Apr 2008 12:18:08 +0200

Hey,

I need to make a 3d surface plot for my function, and i have problems with that. I didn't find the answear in similar topics so i decided to make a new one.

the function is:

G(x,y)=(sqrt(1+2*x^2*y^2))/sqrt((1-y^2)^2))

when i'm trying to create a plot, mathcad report me an error "divide by zero",
even when i'm setting x>0 and y>0

maybe formula is wrong, i don't know
all i want is to show how my variable G depends on x,y

G=(sqrt(1+2*x^2*y^2))/sqrt((1-y)^2))

and i want to make a plot ...G on Y axis, x on X, y on Z. What is the right formula...?How should i do this?

best regard!
Damien

RE: [mathcad] 3d graphs for random functions

Author: Neil Harris Posted: Wed, 2 Apr 2008 12:31:28 +0100

Damien,

Your function becomes infinite at y = +/- 1, as 1 - y^2 = 0 at these values.

Neil

________________________________

From: Damian Ga³êziowski "mailto:damian.galeziowski"
Sent: 02 April 2008 11:18
To: "mathcad"
Subject: [mathcad] 3d graphs for random functions

Hey,

I need to make a 3d surface plot for my function, and i have problems with that. I didn't find the answear in similar topics so i decided to make a new one.

the function is:

G(x,y)=(sqrt(1+2*x^2*y^2))/sqrt((1-y^2)^2))

when i'm trying to create a plot, mathcad report me an error "divide by zero",

even when i'm setting x>0 and y>0

maybe formula is wrong, i don't know

all i want is to show how my variable G depends on x,y

G=(sqrt(1+2*x^2*y^2))/sqrt((1-y)^2))

and i want to make a plot ...G on Y axis, x on X, y on Z. What is the right formula...?How should i do this?

best regard!

Damien

Re: [mathcad] 3d graphs for random functions

Author: =?iso-8859-2?Q?Damian_Ga=B3=EAziowski?= Posted: Wed, 2 Apr 2008 17:45:54 +0200

helo Neil

problem is exactly when i'm setting y different from 1 and -1 stil the same error. "divide by zero"
have you checked it? do you have 3d surface graph to that?

Damien

ps. can you send me right definition of this function in mathcad?, parameters as well.
From: Neil Harris
To: "mathcad"
Sent: Wednesday, April 02, 2008 1:31 PM
Subject: RE: [mathcad] 3d graphs for random functions

Damien,

Your function becomes infinite at y = +/- 1, as 1 - y^2 = 0 at these values.

Neil

From: Damian Ga³êziowski "mailto:damian.galeziowski"
Sent: 02 April 2008 11:18
To: "mathcad"
Subject: [mathcad] 3d graphs for random functions

Hey,

I need to make a 3d surface plot for my function, and i have problems with that. I didn't find the answear in similar topics so i decided to make a new one.

the function is:

G(x,y)=(sqrt(1+2*x^2*y^2))/sqrt((1-y^2)^2))

when i'm trying to create a plot, mathcad report me an error "divide by zero",

even when i'm setting x>0 and y>0

maybe formula is wrong, i don't know

all i want is to show how my variable G depends on x,y

G=(sqrt(1+2*x^2*y^2))/sqrt((1-y)^2))

and i want to make a plot ...G on Y axis, x on X, y on Z. What is the right formula...?How should i do this?

best regard!

Damien

RE: [mathcad] 3d graphs for random functions

Author: Neil Harris Posted: Thu, 3 Apr 2008 10:47:30 +0100

Damien

If a divide by zero happens anywhere other than when y = +/- 1, then what you actually have is not the same as what you think you have.

Try the enclosed script.

Neil

________________________________

From: Damian Ga³êziowski "mailto:damian.galeziowski"
Sent: 02 April 2008 16:46
To: "mathcad"
Subject: Re: [mathcad] 3d graphs for random functions

helo Neil

problem is exactly when i'm setting y different from 1 and -1 stil the same error. "divide by zero"

have you checked it? do you have 3d surface graph to that?

Damien

ps. can you send me right definition of this function in mathcad?, parameters as well.

From: Neil Harris "mailto:N.Harris"

To: "mathcad"

Sent: Wednesday, April 02, 2008 1:31 PM

Subject: RE: [mathcad] 3d graphs for random functions

Damien,

Your function becomes infinite at y = +/- 1, as 1 - y^2 = 0 at these values.

Neil

________________________________

From: Damian Ga³êziowski "mailto:damian.galeziowski"
Sent: 02 April 2008 11:18
To: "mathcad"
Subject: [mathcad] 3d graphs for random functions

Hey,

I need to make a 3d surface plot for my function, and i have problems with that. I didn't find the answear in similar topics so i decided to make a new one.

the function is:

G(x,y)=(sqrt(1+2*x^2*y^2))/sqrt((1-y^2)^2))

when i'm trying to create a plot, mathcad report me an error "divide by zero",

even when i'm setting x>0 and y>0

maybe formula is wrong, i don't know

all i want is to show how my variable G depends on x,y

G=(sqrt(1+2*x^2*y^2))/sqrt((1-y)^2))

and i want to make a plot ...G on Y axis, x on X, y on Z. What is the right formula...?How should i do this?

best regard!

Damien

Attachments:
SurfacePlot.mcd

Re: [mathcad] 3d graphs for random functions

Author: =?iso-8859-2?Q?Damian_Ga=B3=EAziowski?= Posted: Fri, 4 Apr 2008 09:43:37 +0200

helo Neil

thanx for help, now i see, and the script works.

Damien
From: Neil Harris
To: "mathcad"
Sent: Thursday, April 03, 2008 11:47 AM
Subject: RE: [mathcad] 3d graphs for random functions

Damien

If a divide by zero happens anywhere other than when y = +/- 1, then what you actually have is not the same as what you think you have.

Try the enclosed script.

Neil

From: Damian Ga³êziowski "mailto:damian.galeziowski"
Sent: 02 April 2008 16:46
To: "mathcad"
Subject: Re: [mathcad] 3d graphs for random functions

helo Neil

problem is exactly when i'm setting y different from 1 and -1 stil the same error. "divide by zero"

have you checked it? do you have 3d surface graph to that?

Damien

ps. can you send me right definition of this function in mathcad?, parameters as well.

From: Neil Harris

To: "mathcad"

Sent: Wednesday, April 02, 2008 1:31 PM

Subject: RE: [mathcad] 3d graphs for random functions

Damien,

Your function becomes infinite at y = +/- 1, as 1 - y^2 = 0 at these values.

Neil

From: Damian Ga³êziowski "mailto:damian.galeziowski"
Sent: 02 April 2008 11:18
To: "mathcad"
Subject: [mathcad] 3d graphs for random functions

Hey,

I need to make a 3d surface plot for my function, and i have problems with that. I didn't find the answear in similar topics so i decided to make a new one.

the function is:

G(x,y)=(sqrt(1+2*x^2*y^2))/sqrt((1-y^2)^2))

when i'm trying to create a plot, mathcad report me an error "divide by zero",

even when i'm setting x>0 and y>0

maybe formula is wrong, i don't know

all i want is to show how my variable G depends on x,y

G=(sqrt(1+2*x^2*y^2))/sqrt((1-y)^2))

and i want to make a plot ...G on Y axis, x on X, y on Z. What is the right formula...?How should i do this?

best regard!

Damien

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