Population growth in 7 years

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

Answer 1

[Fabio Freschi]

% rate
r = 0.0063;
% years
t = 7;
% initial population
a = 5e6;

% population
y = a*(1+r)^t

[Ydd97]

Hi, thank you so much for helping me :)

Just wondering if I want to make a graph out of this, is it possible to use

for i=1:y

and then plot for (t,y) ?

[Fabio Freschi]

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]

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 ?

Answer 2

[Fabio Freschi]

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);

[Hend Nasrallah]

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.