Partial Sums Using For Loop: Plotting Only First Output?

Follow-up question to this question: http://www.mathworks.com/matlabcentral/answers/175676-partial-sums-using-for-loop#answer_167102

I'm trying to plot that function in relation to M, where M is the vector 1:10. For some reason it's only plotting the first output value (2) no matter what the x value is.

I know it needs to iterate through M, so I've tried to do that with an index i here, but to no avail:

    function g = Pset0_P5_fxn(x,M)
   g = 0; % Initialize g
   i = 1:10;
   for n = M(i)
       a = ((x.^n)./(factorial(n)));
       g = g + a;
   end
end

Answer 1

[Star Strider]

You have to subscript ‘g’ if you want to plot all the values in the loop summation:

Your function:

function g = Pset0_P5_fxn(x,M)
g(1) = 0; % Initialize g
k = 1:M;
for n = 1:length(k)
    a = ((x.^n)./(factorial(n)));
    g(n+1) = g(n) + a;
end
end

Then calling your function and plotting ‘g’:

gexp = Pset0_P5_fxn(1, 10);                 % Calculate ‘Pset0_P5_fxn(1,10)’

figure(1)
plot([1:length(gexp)], gexp)
grid