Question: 'eval' function for a matrix

Hi guys

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


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:


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


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