How can I create sine wave with varying amplitude between certain range?

I am trying to create a sine wave with varying amplitude. I am using a function for amplitude i.e., sqrt(t) where t is the time stamps. This is creating a sine wave with smoothly increasing amplitude. But I want amplitude to vary between certain range keeping the frequency same. For example, between 1 and 5. Below is the code which I wrote.

fs = 2560; % Sampling frequency
dt = 1/fs; % seconds per sample 
StopTime = 5; % seconds 
t = (0:dt:StopTime)'; % seconds
F = 20; % Sine wave frequency (hertz) 
amp = sqrt(t);
data = amp.*sin(2*pi*F*t);
figure(1);clf(1);
plot(t,data);
title('Sine Wave');

What should be the function of amplitude in order to achieve varying amplitude?

[Image Analyst]

How exactly do you want the amplitude to vary between 1 and 5? Linearly from 1 at the start to 5 at the end? Oscillating like a sine wave? Exponential decay from 5 at the start to 1 at the end? You have to specify some formula.

[Subham Sutaria]

I want amplitude to linearly vary between 1 and 5.

I used linspace function and it worked.

Thanks for replying.

[RAHUL DOGRA]

I want an increased sine function than make it constant after some particular value how can I do that?

Answer 1

[VBBV]

%if 
amp = 1:2:5;
data = amp.*abs(sin(2*pi*F*t))

Use abs to plot only the fixed amplitude range

[Subham Sutaria]

Thank you for the reply. it worked. But I wanted more like a single sine wave with varying ampltiude, not multiple sine waves. Is it possible?