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Need help fixing a function error

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Chris
Chris 2013-9-30
回答： Wayne King 2013-9-30
Alright so have to m files open but every time i try to call up my function it says that the function definition is not allowed in that context. What does the error mean? go slow This is the question (a) Write a function file that accepts the values of r, a and n as arguments and uses a for loop to return the sum of the first n terms of the geometric series. Test your function for a = 3, r = 1=2 and n = 10. (b) Write a function file that accepts the values of r, a and n as arguments and uses the built in command sum to find the sum of the first n terms of the geometric series. Test your function for a = 3, r = 1=2 and n = 10. Hint: Start by defining the vector e=0:n-1 and then evaluate the vector R = r.^e. It should be easy to figure out how to find the sum from there. and this is what i have
a=3;
r=1/2;
g=0;
for n = 0:10
fx=geometricfunction
end
and my function file
function g=geometricfunction(a,r)
fx=g+a.*r.^n
end
I am still lost right now and dont have any idea what to do

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回答（1 个）

Wayne King
Wayne King 2013-9-30
You don't want to call the function inside of a for loop, you want to write the loop inside of the function
Also, Matt J started to try and help you here:
Geometric series question
So please do not make a new post when you have an active post for the same question.

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