just started matlab just wondering how to set up a 'for' loop

[the cyclist]

It is a bit difficult to help you here, without just writing out the full code.

I would highly recommend watching the MATLAB Onramp tutorial, and also reading the documentation of the for statement, which has a few examples. Then, you could try to write the code yourself, and come back with specific questions.

[Bethany Young]

the question had asked for x to be 0.8, this is what i down so far however i dont think i have done it right it followed what what written on onramp

x = 0.8;

S = 0;

for n = 1:inf

S = S +((-1)^n+1)./(2*n-1)*x^(2*n-1);

end

S;

[James Tursa]

That's a good start. Three suggestions:

• Change the top value inf to some finite number
• wrap the -1 exponent in parentheses, e.g. (-1)^(n+1)
• To display the answer you can use disp(S) or maybe look at fprintf( )

[James Tursa]

Are you supposed to sum these terms until the terms get small enough that they don't affect the sum? Or ...?

[Bethany Young]

ive been asked to do the first 10 terms so ive just changed inf to 10

[James Tursa]

Then I think with the -1 exponent correction you are done.

Answer 1

[James Tursa]

Here is an outline to get you started:

x = _____;
nmax = _____;
result = 0;
for n=1:nmax
    result = result + _____;
end

You need to fill in the blanks. The x value and the maximum n value to use. For the blank inside the for-loop, you need to write an expression involving x and n that matches the terms in your sum formula.