draw a line to where the area approach?

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Khang Nguyen
Khang Nguyen 2020-11-21
评论： Khang Nguyen 2020-11-22
I want to draw a line to where the area is approaching. How should i do it?
% excersice 1:
clear all
a = 1
area = 0
figure;
hold on
for i = 1:20
a = a + a
area = area + (a *(1/8).^i)
scatter(i,area)
end
ylabel("value of series")
xlabel("n")

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采纳的回答

Image Analyst
Image Analyst 2020-11-22
You can use yline() if you have a fairly recent version of MATLAB:
% Exercise 1:
clear all
fontSize = 18;
a = 1
area = 0
figure;
hold on
for k = 1:20
a = a + a
area = area + (a *(1/8) .^ k)
plot(k, area, '.', 'MarkerSize', 40)
end
caption = sprintf('Final value at %.4f', area);
title(caption, 'FontSize', fontSize)
ylabel("value of series", 'FontSize', fontSize)
xlabel("n", 'FontSize', fontSize)
grid on;
yline(area, 'LineWidth', 2, 'Color', 'r');

更多回答（1 个）

KSSV
KSSV 2020-11-22
a = 1 ;
i = 1:20 ;
area = zeros(size(i)) ;
for i = 1:20
a = a + a ;
area(i) = (a *(1/8).^i) ;
end
i = 1:20 ;
plot(i,cumsum(area))
ylabel("value of series")
xlabel("n")

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