Greg Dionne
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Answer 10 questions that were unanswered for more than 30 days
Awarded to Greg Dionne on 19 Jan 2018
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Feeds
How is the number of sample points returned by waypointTrajectory determined?
It's hard to say for certain without trying your specific value for the sample rate, fs, and desired ending time, tEnd, but off-...
mehr als 2 Jahre vor | 0
| akzeptiert
Average of a each vertical section of a stepped sawtooth wave
If you have the Signal Processing Toolbox, FINDCHANGEPTS is worth a look (it will give you the indices of each step of which you...
mehr als 3 Jahre vor | 1
changing color of structure which defined as object
The platformPlotter is intended to plot (possibly multiple) objects at once with a unique color. The orientationPlotter is in...
mehr als 3 Jahre vor | 1
| akzeptiert
How to edit original data in for-each equivalent statement
You can often avoid the need for references and the for-loop altogether in MATLAB. This example should get you started: classd...
etwa 5 Jahre vor | 0
| akzeptiert
Segmentation of audio signal.
If you have the Signal Processing Toolbox, buffer may be what you're after. Hope this helps! -Greg
mehr als 5 Jahre vor | 0
RMS Function Returns NAN
It's likely you have NaN in your input, or your input is an empty vector. If you wish to exclude NaN values from computation, t...
mehr als 5 Jahre vor | 0
| akzeptiert
thd() in matlab workspace shows me an unexpected result, is anything wrong ?
The default window used when running the THD function has a wide rolloff which masks the second and third harmonics in your sign...
mehr als 5 Jahre vor | 2
| akzeptiert
Why this bandpass butterworth is unstable (while the corresponding low and high pass are stable)?
You will have better results if you use second-order sections. See the "Limitations" section of https://www.mathworks.com/help/...
mehr als 5 Jahre vor | 2
| akzeptiert
medfreq with delta-F threshold ?
From what I can tell your sinusoid is around ~895 Hz and has fairly clean second and third harmonics. So I took that as the sta...
mehr als 5 Jahre vor | 0
| akzeptiert
measure time from fft spectrogram
You can extract the time vector from the third output of the spectrogram function. [S,F,T,Pxx] = spectrogram(X,...) F is the...
mehr als 5 Jahre vor | 1
| akzeptiert
Fast Fourier Transform of the subtraction between a signal and the same signal but shifted
Circularly shifting in the time domain is equivalent to multiplying by a phase ramp in the frequency domain. The FFT of the va...
mehr als 5 Jahre vor | 1
| akzeptiert
How to get pairwise distance matrices from dynamic time warping dtw on a matrix of time series ?
Your signals look extremely well time-aligned (within a sample). Since you have NaN, I suppose you could just perform a weigh...
mehr als 5 Jahre vor | 0
Warping window in "findsignal()" for dtw as TimeAlignment.
At the moment there are no warping constraints used in the FINDSIGNAL variant of DTW. I'm usually successful at coaxing it to...
mehr als 5 Jahre vor | 0
FFT of Downsampled Signal
Hi Adam, If you have significant noise on the signal, then decimate(x,10) or resample(x,1,10) would be preferable. Your result...
mehr als 5 Jahre vor | 1
| akzeptiert
Making a video showing trajectories of particles
This should get you started: load Trajectories.mat hAxes = newplot; colors = lines(10); axis(hAxes,[0 1300 0 1100]) f...
mehr als 5 Jahre vor | 0
| akzeptiert
DSP TOOL BOX NOT WORKING Spectrum Analyzer For Two-Sided Power Spectrum
This worked for me: sin = dsp.SineWave('Frequency',100,'SampleRate',1000); sin.SamplesPerFrame = 1000; scope = dsp.SpectrumAn...
mehr als 5 Jahre vor | 1
| akzeptiert
Generating a sound that goes up and down in frequency - based on a vector of numbers
Hi Harriet, I'm glad you have the Signal Processing Toolbox and were successfully able to use vco, resample, and spectrogram to...
mehr als 5 Jahre vor | 0
Weighted spline for calculating trajectory with lowest possible lateral acceleration
I'm not certain if I understood your question correctly, but you could try adapting the approach in the drivingScenario trajecto...
mehr als 5 Jahre vor | 0
How to select matching records based on the differences in their detection time?
I think you want something like this(?): function [t1s, t2s] = szanto(t1, t2) % compute time vectors offset from first tim...
mehr als 5 Jahre vor | 0
How to find the slope of phase data (between two points) which is uneven
You could try a combination of <https://www.mathworks.com/help/matlab/ref/unwrap.html unwrap> (to remove the jumps of your array...
etwa 6 Jahre vor | 0
Looking for a way to patch 44k polygons fast
Have you tried using just one patch? You can specify X and Y as matrices (this example taken from the doc page on <https://www....
etwa 6 Jahre vor | 0
| akzeptiert
how to apply dynamic time wrapping
DTW(X,Y) can work on vectors of non-equal length. It will repeat elements in either X or Y so that the comparison is of the sam...
etwa 6 Jahre vor | 0
| akzeptiert
How can I determine the diameter (inner and outer) of the ring profile?
Try this link: <https://www.mathworks.com/help/images/detect-and-measure-circular-objects-in-an-image.html>
etwa 6 Jahre vor | 0
Why does findchangepts doesn't work right?
If you have R2016b or later try: Fs = 100; [sst,f] = fsst(Ch9,Fs,kaiser(512,10)); fridge = tfridge(sst,f,10,'NumRidge...
etwa 6 Jahre vor | 1
Time response of the voltage
Most of the documentation for the bilevel measurements panel can be found here: <https://www.mathworks.com/help/simulink/ug/bile...
mehr als 6 Jahre vor | 0
| akzeptiert
ismember runs too slow (others have asked similar questions)
Looks like your positional data could fit in a 3-D histogram (168x24x168). This could be made considerably faster, but hopefull...
mehr als 6 Jahre vor | 1
| akzeptiert
plot a smooth envelope for oscillation curves
Do you have a particular selection criteria for the peaks or formula for how you would like the smoothing performed at the ext...
mehr als 6 Jahre vor | 0
| akzeptiert
How to combine Matlab's build-in functions dtw and pdist?
You'll want to take the output of DTW and put it into a form that PDIST can recognize. This should get you started: func...
mehr als 6 Jahre vor | 1
Filter big data simulink or matlab
<https://www.mathworks.com/help/signal/ref/hampel.html hampel> should get you started plot(hampel(OutAIS.Data)) If you n...
mehr als 6 Jahre vor | 1
| akzeptiert
colthoid fitting using trajectory();
The trajectory generator uses a fast discrete solver to obtain a G2-continuous path, so some discontinuities (usu < 1 degree/met...
mehr als 6 Jahre vor | 0
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