## 4 Badges

13 years, 32 days

## 'eval' function for a matrix...

Hi guys

I've got a Jacobian matrix defined in my maple code to be:

m1

The matrix consists of expressions involving the variables R,X,Y,Z,t where R:=(X2+Y2+Z2)0.5

I wish to evaluate the matrix for X=1, Y=1, Z=1, t=1ONLY. but I want to leave R alone. I've tried using the code:

eval(m1,{X=1,Y=1,Z=1,t=1}):

but Maple evaluates it for all the vaiables including R.

Is...

## urgent help needed! Supernovae graphs...

Maple

Hello,

I'm under pressure to complete the following plot for a Masters project. I just can't seem to find where the errors are. I'd be very grateful if anyone can help.

x*,y*,zare independent variables

r*(x*,y*,z*):=(x*2+y*2+z*2)0.5:

r(x*,y*,z*,t):=  (r

## Supernovae mesh plot...

Maple

Hey Guys,

I have plotted the following graph, its the position of an elementary volume before a supernovae takes place.

x0=r0sinθ0cosΦ0

y0=r0sinθ0sinΦ0

z0=r0cosθ0

Created a mesh of 10 mesh points, divided the ranges

0<r<1

0<θ<∏

## Mesh Points Plot for Supernova...

Maple

Hey guys I'd be grateful if you can help me plot the following graph. It's the position of an elementary volume before a supernova takes place.

x0=r0sinθ0cosΦ0

y0=r0sinθ0sinΦ0

z0=r0cosθ0

create a mesh of 10 mesh points, divide the ranges

0<r<any positive value

## Spherical coordinates...

This problem has been doing my head in for a long time now! I'd be very grateful if anyone can help.

I need to plot this function f(r,theta,phi)=exp[-(r-r0)2/22]. where r0=4 But first, if this is in spherical coordinates, where's the theta and phi in this expression? Why are they missing?

I believe the code required to plot this is something like: sphericalplot(f(r),r=0..5,theta=0..2Pi,phi=0..2Pi), but...

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