# Questions tagged [frequency]

The tag has no usage guidance.

18 questions
Filter by
Sorted by
Tagged with
67 views

### FindFit low speed when fitting polynomial coefficients: is it possible to significantly increase the speed?

I work in Mathematica with a Butterworth filter, the transfer function of which depends on the selected order and cutoff frequency. I want to evaluate the change in the location of the roots on the ...
107 views

### Identifying the three frequencies using fourier transform

The following simple function has clearly three frequency components: ...
141 views

### How can I add two sin waves of different amplitude and frequency? [closed]

I've been tearing up the internet, but I can only find explanations for adding two sine waves of same amplitude and frequency, two sine waves of different amplitudes, or two sine waves of different ...
249 views

### Another way to calculate frequency from Fourier transform

I have some trouble with calculating frequency after Fourier transform. My code: ...
140 views

### Fourier transform of non-uniform sampled data

I need to perform an inverse Fourier transform of this set of data, which is in the frequency domain (the x-axis is in $\mu$Hz). However, I'm having two doubts $-$ firstly, this spectral spacing is ...
319 views

### Get frequency axis in Fourier transform (and save them)

I am trying to get the Fourier transform of a light-curve (with an even number of points, 300, and equally spaced in time, 6.9 seconds) and my problem is to get the frequency on the x-axis. I can ...
42 views

### Solving an equation in a specfic region

Good morning, I want to find a solution to the following equation: \left|u\cdot\sin\left(2\pi\cdot f\cdot t\right)\right|=u\cdot\exp\left(-\frac{t}{a}\right)\space\Longleftrightarrow\space t=\dots\...
220 views

### frequency shift in Fourier transform

Have a bit of an analysis issue with Fourier transform of a sinusoidal signal: I have a piece of signal that represents spatial scanning of a pattern. xcoordinate is distance and y is amplitude. I'm ...
245 views

### Plotting complex number wrt frequency

I want to plot a complex function wrt frequency. How can i do it? If my function as follows: w=2*Pi*f; Zc=(1/i*w*C) Zl=(i*w*L) Z1=(R*Zc)/(1+Zc*Zl) where i==> ...
209 views

### FindFit and Frequency Data

I wrote a code in Mathematica, which tries to match the data by using a weighted sum of 4-parameter beta distribution. I have real-world frequency data, that look like the below image. In the latter, ...
160 views

### How to find frequency from graph after i solve equation by using NDSolve

How i can find a frequency from graph after i solve equation by using NDsolve. I try to find frequency, and after that i want to plot a graph frequency versus alpha. This is my code ...
836 views

### Frequency decomposition of an mp3 file?

After loading an mp3 file test = Import["test.mp3"] I would like to make a plot with x-axis being the frequency of waveforms ...
661 views

### Automatically finding frequency

For example we have a sinusoidal function and we want to find frequency of this function/ For those we use Discrete Fourier Transform. Code: ...
695 views

### Re and Im of fourier transform for shifted rectangular pulse

I'm currently trying to vizualize the relation between time and frequency domain and their behavior for a single rectangular pulse regarding different paramters. A special focus is set on the real Re ...
98 views

### Why does Continuous Wavelet Transform have phase information at high frequencies?

I'm playing around with ContinuousWaveletTransform using a sine wave of a constant frequency: ...
88 views

### Identify frequency components

I try to perform data analysis on wind power production. Data consist in 17520 points, corresponding to the production averaged over 30 minutes over the 365 days of the year. I somehow expect to see ...