I need to plot a sine wave

I need to plot a sine wave with a frequency of 15 amplitude of 4 time of 0:0.1:1 how do i go about this, thanks :-)

[Jan]

Please use meaningful tags only.

[Subhranil Barman]

Write a MATHLAB code to generate a CT step signal with peak Amplitude of 5 Volts and should be plotted on the time scale from 0 to 1000.

[Rik]

That comment sounds like a homework question. You can find guidelines for posting homework on this forum here. If you have trouble with Matlab basics you may consider doing the Onramp tutorial (which is provided for free by Mathworks). You may also consider re-reading the material you teacher provided and ask them for further clarification.

Answer 1

[Geoff Hayes]

Francis - from an example at fft, we can do

 t = 0:0.01:1;
 f = 15;
 a = 4;
 y = a*sin(2*pi*f*t);
 plot(t,y);

Though ten samples (your t) may not be enough to accurately represent the sine wave (that you are attempting), so try

 Fs = 1000; 
 t = linspace(0,1-1/Fs,Fs);
 f = 15;
 a = 4;
 y = a*sin(2*pi*f*t);
 plot(t,y);

[Francis Arthur-Worsop]

thank you very much :-)

Answer 2

[Junyoung Ahn]

clear;
clc;
close;

f=15; %frequency [Hz]
t=(0:1/(f*100):1);

a=4;    %amplitude [V]
phi=0;  %phase
y=a*sin(2*pi*f*t+phi);
plot(t,y)
xlabel('time(s)')
ylabel('amplitude(V)')

[Sinan Islam]

Good job!

Answer 3

[Jos (10584)]

This is the general formula of a sine wave. If leave it to you to fill in the numbers.

y = Amplitude * sin(2*pi*f*t + phase)

Answer 4

[cesar moreno]

If you need to load the generated data into an array of length N

then,

int k (the index of the array)

int N (the number of points in the data array)

The ARRAY holds values of type FLOAT example: array is called data[N] each location is a FLOAT

y = Amplitude * sin(2*pi*f*t + phase)

for k = 0 to N (load one location at a time)

data[k] = Amplitude * sin( ((2*pi*f*k)/N) + phase )