Question: '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 there I code I can use just for X,Y,Z,t?

 

Many Thanks

Jimmy 

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