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These are questions asked by apbraga

Hi there,

I need to differentiate a summation like

sum(sum(u[i,j]^2*d[i,j]^2,j = 1 .. N),i = 1 .. c)

in relation to an arbitrary element, say u[s,t].

I usually get 0, whereas the expected response is


Does anyone know if this is possible in Maple?




Hi there, I am trying to give my first steps into Maple (I have been a Matlab user for years),and I have the following problem.

The elements of my matrix  U[s, t] are defined as

U[s, t] := 1/(sum((d[s, t]/d[j, t])^2, j = 1 .. c))

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