已回答
Gaussian FFT
Try plotting the absolute value of the frequency domain amplitudes... when your Gaussian is not centered at time 0, the phase ma...

12 years 前 | 1

| 已接受

已回答
Anyone using MATLAB on a LINUX OS??
Works fine for me on Redhat... running it on a 12-core, 96GB machine at work. Any simple-ish benchmarks you looking to test/meas...

12 years 前 | 0

已回答
I want to plot PSD for my input data(meters)
If you are measuring displacement in meters in the time domain, then your frequency domain amplitudes (after performing the FFT)...

12 years 前 | 0

| 已接受

已回答
Difference between fft and manually coding for a fourier transform
You are not correctly defining the frequencies "k" that are associated with the amplitudes in the frequency domain, but it start...

12 years 前 | 0

| 已接受

已回答
Scaling of fft output?
See my answer here: <http://www.mathworks.com/matlabcentral/answers/15770-scaling-the-fft-and-the-ifft> In order to conse...

12 years 前 | 0

已回答
Is there any alternative to if statements inside for loops?
Do you pre-allocated "Pin", if not... then before the for-loops put: Pin = zeros(8760,Ni); The inside of your for-loops ...

12 years 前 | 0

已回答
impulse response interpretation
I reran through the process of generating the Frequency Response data (G) using your code and the one from the FEX just to see i...

12 years 前 | 0

已回答
from time domain to frequency domain and back to time domain
Your "X" has shifted the zero frequency amplitude to the center. You need to use *ifftshift* to get it back where Matlab expects...

12 years 前 | 0

| 已接受

已回答
I cant generate a square wave in matlab using the square wave command
If you dont have the Signal Processing Toolbox, will the following work as an alternative: y = sign(sin(2*pi*100*t));

12 years 前 | 2

已回答
obtain the Impulse response from a frequency response
N = 1000; % Number of samples df = 20; % Frequency increment (in Hertz) Nyq = 10000; % Nyquist Frequency (in Hertz) ...

12 years 前 | 4

| 已接受

已回答
Can my integration code for an accelerometer data work for a Square wave?
Instead of trying to convert using your code, try mine located here: <http://www.mathworks.com/matlabcentral/answers/21700-fi...

12 years 前 | 0

| 已接受

已回答
Help With Plot Legend
If you are just trying to apply the 3 legend strings to 3 lines on a plot, then all you need to do is: legend(cell) Take...

12 years 前 | 0

已回答
What does x(1,:) do in MATLAB ?
"a0" is the Fourier Transform of the first row of "at" at(2,:) % gives the second row at(3,:) % gives the third row (and s...

12 years 前 | 15

| 已接受

已回答
Interpreting frequency using pwelch function
1/26.0893 years per sample equals roughly 1208771.41 seconds per sample, which is roughly equivalent to an Fs of 8.27286276e-07 ...

12 years 前 | 0

已回答
if statement for range of array values
I think what you might be after is something like: if all(x(i-1:i+1) < xmax) || all(y(i-1:i+1) < ymax) % something e...

12 years 前 | 0

已回答
Rows
a = rand(1000,5); b = min(a,[],2);

12 years 前 | 1

| 已接受

已回答
Question about fft
The way it is implemented above, the value at 0 frequency is just the sum of your signal from -1 seconds to 1 second (you have a...

12 years 前 | 0

已回答
quick easy question
It looks like "t" is an array of numbers, therefore you need to incorporate a "." before you multiply "(B1*cos*(Omega_d*t) + B2*...

12 years 前 | 0

已回答
Create a array of 1 and -1
Not the most efficient, but: >> a=nchoosek([1,2,3,4,5,6,7,8],4); >> b = ones(size(a)); >> b(mod(a,2)==0) = b(mod(a,2)==0)...

12 years 前 | 0

已回答
FFT single-sided amplitude spectrum plot spike at 1Hz of accelerometer data
As a general rule of thumb, I will remove any trend and/or mean from the data before I run it through FFT.

12 years 前 | 0

| 已接受

已回答
why fgetl read spaces?
If they are all just numbers on the line, then converted the string to numeric should do the trick new_t = str2num(t);

12 years 前 | 1

已回答
Matrix of statuses or matching; discrete one-to-one mapping
You can't do this with any old NxK matrix, it must be a square NxN matrix. Otherwise your condition, that the sums of individual...

12 years 前 | 0

| 已接受

已回答
plotting the frequency spectrum
Your "f" looks off. For your configuration (which uses fftshift): N = length(y); dt = x(2)-x(1); % Time increment Nyq = 1...

12 years 前 | 0

已回答
How to extract correct FFT?
Just to eliminate a few things, try this: dt = time(2)-time(1); Fs = 1/dt; M = length(gage); N = pow2(nextpow2(M)); ...

12 years 前 | 0

| 已接受

已回答
Alternative to using "unix(sprintf('ls %s/*/*/*.out',pathname))" ?
I ran a test... Running this from Matlab: [~,List] = unix(sprintf('ls %s/*/*/*.out',pathname)); And then doing some m...

12 years 前 | 0

| 已接受

已回答
How to create 'density' plot from 2d scatter data
Check out the example for *hist3* in the Help navigation window... maybe useful here.

12 years 前 | 1

已回答
combine ARRAYS
doc cat This should work, too: C = [A ; B];

12 years 前 | 0

| 已接受

已回答
Sequence within a sequence
To beat a dead horse... I thought I remembered a version by Walter using *cumsum*, but I couldn't find the link. Here's my at...

12 years 前 | 1

已回答
Calculating energy
In order to obtain energy, do not even worry about the power. Just do this: Using "*y*" and "*f*" from the output of spectrog...

12 years 前 | 1

| 已接受

已回答
Guide- coma
Yes. Every time the user types something and then hits enter, or tab, or clicks somewhere else in the GUI, etc. the callback fun...

12 years 前 | 0