# Calculate sum of series using for

5 views (last 30 days)
Angel Hiram Torres Mota on 20 Jun 2019
Commented: James Tursa on 20 Jun 2019
I need help to calculate the sum of this example using only for.
Thanks for the help!

James Tursa on 20 Jun 2019
What have you done so far? What specific problems are you having with your code? This is a very simple for-loop. Do you know how to write a for-loop?
Angel Hiram Torres Mota on 20 Jun 2019
In new to matlab and this is one of my first assignments. Im just confused at the i = m and also confused at what are my inputs. If you can recommend a book of webpage where I can learn more of this, I would also appreciate it.

James Tursa on 20 Jun 2019
Edited: James Tursa on 20 Jun 2019
Here is an outline to get you started:
a = something; % you put a value here
m = something; % you put a value here
x = something; % you put a value here
y = 0; % the starting y value
for i=1:m % the for-loop indexing
% you put code here to add something to y
end % the end of the for-loop
See the Getting Started tutorials here:

Angel Hiram Torres Mota on 20 Jun 2019
Thanks!
Angel Hiram Torres Mota on 20 Jun 2019
a = input("Value of a: ");
m = input("Value of m: ");
x = input("Value of x: ");
y = 0;
for i=1:m
y = ((a)*(x^i));
end
disp(y)
Like this I suppose?
I apologize again, as I said I'm new to this.
James Tursa on 20 Jun 2019
That's a good start at getting the values in. But in the for-loop, you want to be adding terms into y. The way you have it coded now, you are simply replacing the value of y with a new term. You need to correct the code inside the for-loop.