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These are questions asked by lena

what can I do I stuck in it,


where c1 and c2 is constant of three terms

a,b are variables in x


The fubction I've got  for ex:

f(x,y)= sum(exp(x*r[i])*a(r[i]),i=1..3):


r[1],r[2],r[3] are functionsof y

I plot f in 3d in the case when r[i] are values. no problem

but i got confused when r[i] are functions

I'm straggling with Maple. The main purpose is to plot f(x,y)

I have two for loops for x and y  coordinates and I want to plot f(x,y)

for i from 1 to 5 do
for j from 1 to 5 do
here I should type yhr function that depends on x and y( how can)


and then i put the list of  points:=seq,( x,y,f(x,y) ??

and then surfdata(ponts)

is my logic right???



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