Troubleshooting - A Guide to MATLAB for Beginners and Experienced Users - page 254

simplify(ans)

ans =
1/3*n^3+1/2*n^2+1/6*n

(b)

symsum(rˆk, k, 0, n)

ans =
r^(n+1)/(r-1)-1/(r-1)

pretty(ans)

(n+1)
r 1
-------- - -----
r-1 r-1

(c)

symsum(xˆk/factorial(k), k, 0, Inf)

??? Error using ==> fix
Function 'fix' not defined for variables of class 'sym'.

Error in ==> C:\MATLABR12\toolbox\matlab\specfun\factorial.m
On line 14 ==> if (length(n) ~ =1) | (fix(n) ~ =n) | (n<0)

Here are two ways around this difficulty. The second method will not work
withthe Student Version.

symsum(xˆk/gamma(k + 1), k, 0, Inf)

ans =
exp(x)

symsum(xˆk/maple('factorial', k), k, 0, Inf)

ans =
exp(x)

(d)

symsum(1/(z - k)ˆ2, k, -Inf, Inf)