Dear Mapleprimes,

I have a problem with the sum command. I'm differentiating wrt. a value q[i] in a sum. I have the following:

diff(sum((1/2)q[i], i=1..n),q[i]);

This returns:

n(1/2)

but I'm differentiating wrt. q[i] not the whole sum. Any ideas?

Thanks very much.

Christian

Dear Mapleprimes,

I'm trying to add a sequence of numbers using the add command. It appears that it can only add up to a specific number. The following works:

add(2*i, i=1..5)

gives 30.

But it is not possible to do:

add(2*i, i=1..n)

such that n is a parameter.

Does anyone know how to add a finite series of values where n is unknown?

Dear Maple Prime,

I'd like to know if when I use the Solve command, I can restrict the solutions to REAL solutions?

THanks,

Christian

I have just tried to solve for 2 equations in 2 unknowns. The 2 equations are very non-linear. I know for a fact that there are 2 solutions as I can draw the curve, but for some reason and for some parameter specifications Maple will only give me 1 out of the 2 solutions. I use the following:

Solve( [eq1,eq2] , [x,y])

Thanks in advance,

Christian

I guess I have an easy question here. How do you write stuff in Maple which you don't want displayed? For example, if I wanted to set alpha=1 but I didn't want that printed after pressing enter?

Cheers