how to graph using loop?

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Khang Nguyen
Khang Nguyen 2020-11-21
评论： Khang Nguyen 2020-11-21
I want to calculate a problem and graph it
I want to graph i and area but it only show one point on my graph
% question1
clear all
a = 1
vectori = []
areavec = []
figure;
for i = 0:20
a = a + a
area = a *(1/8).^i
scatter(i,area)
end

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采纳的回答

the cyclist
the cyclist 2020-11-21
编辑：the cyclist 2020-11-21
Put the command
hold on
on the line after figure.
See the documentation for the hold command for details.

更多回答（1 个）

Setsuna Yuuki.
Setsuna Yuuki. 2020-11-21
编辑：Setsuna Yuuki. 2020-11-21
You must change this:
clear all
a = 1
vectori = []% ??
areavec = []
figure;
for i = 0:20
a = a + a
areavec(i+1) = a *(1/8).^i %area --> areavec and areavec is a vector, not a scalar
end
i = 0:20;
scatter(i,areavec) %area --> areavec and graph must be out of cycle
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Setsuna Yuuki.
Setsuna Yuuki. 2020-11-21
I edited my answer, now this works :D

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