Dominant frequency of a ramp function (Linear function)

For a linear function y=mx where m is a constant, how to find the m such that the dominant frequency of the signal (y) attains a desired value? The code that I'm writing is yielding a dominant frequency at 0. How can I correct it?

Given the condition that y can reach a maximum value of 3, I need to define the rate of a linear signal y=mx such that the dominant frequency of the signal lies at 0.01.

I'm using the following code to perform this operation:

        y=0.01:0.01:3; %Maximum value of 3 (fixed)
        x=0.1:0.1:30;  %Random values of x are given, and I'm trying to find the dominant frequency for this case. 
        % Based on the result for this x, I would've tweaked my 'x' values so as the dominant frequency reaches 0.01
        y=abs(fft(y)); 
        y=fftshift(y);
        n=length(y);
        f=(-n/2:n/2-1)*(2/n);
        plot(f,y)
        %Issue with the code is that it is yielding a dominant frequency at 0 for all the cases (random x values). 

Further, I want to ask this question that is the dominant frequency for a linear function dependent on the rate at which the sample data are taken (sampling frequency)?

Thanks in advance!