Hi! I need help with how I put an input in this program!

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Anthony Fuentes
Anthony Fuentes 2016-10-15
回答： Geoff Hayes 2016-10-15
Hi! I need help with this program (below).I need to put the n terms with an input, and I don't want that the graph behavior tends to infinity. Thanks a lot.
clear
clc
p = 0; % Start at 0
S = []; % Initiate array of approximations
i = 0;
while 1 == 1 % Infinite Loop
p = p + (4*((-1)^i))/(2*i + 1); % The Leibniz formula for pi: http://en.wikipedia.org/wiki/Leibniz_formula_for_pi
if rem(i,2) == 0 % Alternately set p1 and p2, then average them to find a better approximation
p1 = p;
S = [S p1]; % Append new value to array
if i > 9
plot(length(S)-10:length(S),S(length(S)-10:end))
axis([length(S)-10 length(S) 2 4])
pause(0.1)
else
plot(S)
axis([1 10 2 4])
pause(0.1)
end
else
p2 = p;
S = [S p2]; % Append new value to array
if i > 9
plot(length(S)-10:length(S),S(length(S)-10:end))
axis([length(S)-10 length(S) 2 4])
pause(0.1)
else
plot(S)
axis([1 10 2 4])
pause(0.1)
end
end
i = i + 1;
end

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回答（1 个）

Geoff Hayes
Geoff Hayes 2016-10-15
Anthony - which n terms? Or do you only want the program to iterate for at most n times? If this is true, then just take your script and make it into a function that takes a single input: a maximum number of iterations. Something like
function myFunc(n)
Your while loop then becomes
while i < n
and your result S will have n elements. Since this is a function, make sure that you remove your call to clear.

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