I am very new to this things. Sorry for probably stupid question. I don't understand what units and meaning have the values on Y-axis of Fourier Transform graph? On X-axis it is Frequency (Hz). Pretty clear. Can't find the meaning of Y.
Here is the code in MATLAB I used to produce the graph, and the image of the output:
A = 5; t = 0:1/1000:1; f1 = 7; s = A * sin(2 * pi * fi * t); F = fft(s); figure; plot(abs(F)), (s);