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Question: How to substitute a variables in matix?

Question:How to substitute a variables in matix?

ZhuWeihong 20 Maple
matrix subs
April 25 2012
0

there are four points :

O = (0, 0), P = (0, b/d), Q = (beta/delta, 0), R = ((-d*beta+b*gamma)/(-delta*d+gamma*c), (beta*c-delta*b)/(delta*d-gamma*c))

and then  define the jocbian maxtrix as

J=Matrix(2, 2, {(1, 1) = beta-2*delta*x-gamma*y, (1, 2) = -x*gamma, (2, 1) = -y*c, (2, 2) = b-2*d*y-c*x})

at last , i want to get the jocbian matrix at the four points,  so  must substitute the coordinate of the four point into the jocbian matirx, how i do it ! thank you....
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