How can I plot a sine wave with my data? I'm almost there but I'm stuck

Frequency = 1000 Hz

time = 0.001 sec

Amplitude = 5 V

I want to plot a sine wave for a lab. I want the x-axis (time) to go from -0.001 to 0.001.

The following is the code I tried running:

%PLOT SINE WAVE

f_1 = 1000; %frequency in Hertz

t_1 = 0.001; %time in seconds

A_1 = 5; %amplitude in volts

t = -0.001:0.001; %time (x-axis)

X = A_1 * sin(2*pi*t_1*f_1);

%END OF CODE

I looked online and tried to plot it, but my X value is a single number and not an array. This is where I got stuck. I appreciate any help.

Answer 1

[dpb]

t = -0.001:0.001; %time (x-axis)

There's your problem--the default interval for colon ':' is 1 -- hence the next interval is 0.999 > 0.001 and so you don't get a vector of times but only the first. Here's where linspace is very useful--you don't need to compute a dt explicitly for inconvenient values--

You have already defined a variable t_1; I'll use that to make it easier to modify the code by not burying constants--

t=linespace(-t_1,t_1,50);    % generate 50 points between -/+ t_1

Now evaluate your X with that t and all will be well... :)

[Jad]

Thanks! I got it now.