How to plot the Instantaneous frequency of this function?

I tried the matlab code from its website but got the strange Instantaneous Frequency graph?

f=30; T=-0.4:0.00001:0.4; R=(1-0.5*f.^2*T.^2).*exp(-0.25*f.^2*T.^2);

[Srikanth Sedimbi]

Can you post the link? What exact command did you use to plot? Did you try "plot(T,R)" ?

[bijaya prasad pokhrel]

My function f=30; T=-0.4:0.00001:0.4; R=(1-0.5*f.^2*T.^2).*exp(-0.25*f.^2*T.^2); Copied Instantaneous formula for my case from the below link but got the strange figure. I attached the similar picture. https://kr.mathworks.com/help/signal/ug/hilbert-transform-and-instantaneous-frequency.html

[bijaya prasad pokhrel]

How to calculate the instantaneous frequency of Ricker Wavelet

Answer 1

[Selva Karna]

use frequency and sample with in wave file playing