How to draw straight horizontal line with specific axis

Hello, I am currently working on my project and I am new to Matlab. My question is how to plot straight line vector with specific axis? For Example, I want to plot horizontal line that starts from 1450 to 1470 ( this is the x -axis )

Answer 1

[Voss]

plot([1450 1470],[0 0]) % this line will be at y = 0 because I've given plot [0 0] as the y-coordinates

xlim([1400 1500]) % set the x-limits of the axes to something beyond the horizontal line so you can see it

[Abdullah Alasfour]

Thank you for your help

[Voss]

You're welcome! Any questions, let me know. Otherwise, please "Accept This Answer". Thanks!

Answer 2

[Cris LaPierre]

plot? See Ch 9 in MATLAB Onramp. You might consider going through the entire onramp, too.

plot([1450 1470],[0 0])

[Abdullah Alasfour]

If I want to apply on it Inverse Fourier transform will it work ?

[Cris LaPierre]

That depends. It will do something. What is it you are hoping to accomplish by doing this?

[Abdullah Alasfour]

I am designing a ideally filter that is constant around my required frequency H(w) ( Our Doctor specified that it is ideally ) and I am hoping to build it, so I can do ifft to get h(t) . After that, I will do multiplication or convolution between input and filter to get the output.

[Cris LaPierre]

Not sure we can provide an answer with the information we have.

[Abdullah Alasfour]

No problem, thank your for your help

Answer 3

[Tushar]

Hello Abdullah, you can use the plot function and give the x- vector as per your requirements like shown here :

x = [1450, 1470];  % x-axis limits
y = [5, 5];        % y-values for the horizontal line, you can set your value, 5 is used here for just as example

plot(x, y, 'k-')   % 'k-' represents a black solid line
xlim([1450, 1470]) % set the x-axis limits

Also find a documentation of the 2-D graph plots here : Link

[Abdullah Alasfour]

Thank you for your help

Answer 4

[Image Analyst]

@Abdullah Alasfour I understand that you want to do bandpass filtering of a signal in the Fourier domain. While I don't have any examples of that exactly, I do have some other Fourier filtering demos that might help or at least be interesting. They are attached.

Basically you need to convert your signal to the spectral domain with fft, then zero out the frequencies (indexes) that you don't want, and then inverse transform with ifft