Population growth in 7 years

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Ydd97
Ydd97 2019-11-15
评论： Hend Nasrallah 2021-6-24
Hi,
I want to make a graph that will calculate how the population will change in 7 years in a spesific country. Say in 2018 there is approximately 5 million people in a country, and the growth rate is 0.63%. What will the approximated population be in 2025? Is there anyone that can help me code this.
I have already calculated this using expontential euqation:
y= a(1+r)^t
P = 5(1.0063)^7
P = 5.22 million

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采纳的回答

Fabio Freschi
Fabio Freschi 2019-11-15
% rate
r = 0.0063;
% years
t = 7;
% initial population
a = 5e6;
% population
y = a*(1+r)^t
  3 个评论
显示 1更早的评论
Fabio Freschi
Fabio Freschi 2019-11-15
you must create a vector for the years and for the populations. For this you can use a for loop
for i = 1:7
t(i) = i;
y = a*(1+r)^t(i);
end
figure,plot(t,y)
or, better, use a vectorized notation
t = 1:7;
y = a*(1+r).^t;
figure,plot(t,y);
Hope it helps.
Please accept the answer if you are satisfied
Hend Nasrallah
Hend Nasrallah 2021-6-24
Hi i tried doing this question but the figure is not showing anything, it just giving me blank figure can I know what is the problem with the command ?

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更多回答（1 个）

Fabio Freschi
Fabio Freschi 2021-6-24
Ran in:
Below you can find the output of the following code
% rate
r = 0.0063;
% years
t = 7;
% initial population
a = 5e6;
t = 1:7;
y = a*(1+r).^t;
figure,plot(t,y);
  1 个评论
Hend Nasrallah
Hend Nasrallah 2021-6-24
thank you, but i have question if we want to plot years for example from 2018 to 2025 how can we plot it using the same question and for loop.

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