William Rose

Active since 2007

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unable to load file in Matlab Answers
I have been unable to load data from a file in Matab Answers for a week or more. I can attach a data file to my answer by click...

1 day ago | 0 answers | 0

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Answered
How to constrain the time and how to derive the acceleration and position trajectories from given velocity trajectory?
@Alireza, You are correct: trapveltraj(,EndTime=tEnd) assumes tEnd is a scalar or a vector of segment durations. Example 1: Th...

1 day ago | 0

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Answered
Determine of coherence using Transfer function (Bode plot)
@Kumaresh Kumaresh, The coherence equals one in your example because you estimated the spectra Pxx, Pyy, and Pxy using a single...

2 days ago | 0

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Issue with Fitting Damping Model to Experimental Data
@Ts, You say q(t) is a response. Response to what? To v(t), I assume. But you have not told us v(t). If you apply the differ...

7 days ago | 0

Submitted

SNR of ECG
Estimate signal to noise ratio for electrocardiogram.

8 days ago | 2 downloads |

Answered
Signal quality assessment with SNR in Matlab
@Elzbieta, This is a long answer, but I don't have time to write a shorter one. My reading of your calc_snr() code is that it ...

11 days ago | 0

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Answered
Preserving relative proportions in graph after introducing bias in log scale plot
@Samuel, [Edits: Correct spelling errors, including "ch2inv" to "chi2inv".] [Edit: Correct formula for .] I have not tried to...

11 days ago | 0

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Answered
Plotting the Electric field of a SPR sensor
@Mohamed, Do you have the data, and you want to know how to make a plot? If so, see here. If you are looking for a formula fo...

12 days ago | 0

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How can I draw a bifurcation diagram of the logistic dynamical coupled logistic map lattice system in MATLAB?
@Harpreet, What have you done so far? Your function L(e) is the logistic map function, with r=3.99. You have not specified th...

19 days ago | 0

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Answered
Violinplot extending beyond data range
@Angie, [Edit: add ylim() so that all 3 plots have same y-axis range.] You can vary the bandwidth, or the kernel function, or...

20 days ago | 0

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How do I interpret the output from fftn? (performed on a 3D matrix: time x spatial dimension 1 x spatial dimension 2)
@Neil Bailey, When you compare the 2d FFT to the 3d FFT, you must view slices through the 3d FFT that correspond to the plane ...

20 days ago | 1

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Answered
Layered Damped Soil on Elastic Rock - Site Amplification in Kramer Book
@ibrahim can beziklioglu, You included two plots: a matlab-generated plot of Amplification factor as a funciton of frequency, a...

20 days ago | 0

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SNR vs Amplitude plot for ECG Lead
@Elzbieta, You have 21 amplitudes, 17 heart rates, and 8 leads (I, II, and V1 thorugh V6). That is a lot of combinations. I c...

22 days ago | 0

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Calculating calibration ECG device parameters
@Elzbieta, [edit: fix spelling mistakes] As you know, the MPS450 allows the user to specify various output waveforms. See tabl...

22 days ago | 0

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How to extract features from an ECG signal using ECGPUWAVE tool provided by physionet in MATLAB?
@Radu Stelu, ecgpuwave.m, here, is a matlab wrapper that calls an executable. there is additional info about ecgpuwave.m here. ...

22 days ago | 0

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How to modify the filter to match the power output of the wind turbine with the wind speed?
@jana nassereddine, The horizontal axis labels and values are partly cut off, or absent, on the three images you uploaded which...

27 days ago | 0

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Increasing value over time of Power of a audio signal
@Alex Kouroupis, You say "I need to calculate the power myself cause i need the values for a model". The first plot you pro...

1 month ago | 1

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Answered
Compare probability density functions of 2 vectors
@T.C., [Edit: fix error in my code below.] The 2 sample Kolmogorov-Smirnov test. x1=rand(1,50); x2=rand(1,40); [h,p]=kstest...

1 month ago | 2

Answered
MLS(moving least squares) algorithm problem... help me!!!
@종영, In your comment you refer to "cubic spline function". Cubic splines for smoothing can be done with csaps(). The code be...

1 month ago | 0

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Handling Multiple UTM Zones for Azimuth and Elevation Calculations in MATLAB
@Lidor, if I had to compute azimuth and distance for locations specified across multiple UTM zones, I would just convert to lat,...

1 month ago | 0

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Input for ARfit ? (EEG analysis)
@Annaëlle, [Edit: fix spelling.] Have you run the script ardem.m, which is part of the ARfit toolbox? Does it produce reason...

1 month ago | 1

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Plot the tidal ellipses for the four major tidal constituents
@은진, The line idx = find(strcmp(NAME, major_constituents{i})); does not work, because strcmp(NAME, major_constituents{i}) ...

1 month ago | 0

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Answered
2D Fourier transform- problems with the shift
@nathan blanc, Reconstructing the 2d DFT is a little tricky. The attached script uses the Nk largest components of the 2d DFT t...

2 months ago | 0

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My MATLAB psgnifit code is calculating the wrong values from the plot and I am unable to resolve it. Please help.
@Adithi Anil, I have not tried running your code. I notice that gamma=0; % lower symptote, supposedly lambda=10; % upper sympt...

2 months ago | 1

Answered
Why does the phase response get cutoff beyond a frequency?
Check the values returned by freqz. Answering on my cellphone so I’m limited in what I can do. Look for NaNs at high frequencies...

2 months ago | 0

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quaternion kinematic formulation in attitude dynamics block does not seem to be complete.
@Gökhan, I think you are correct. A factor of (-1/2) should multiply the right hand side matrices in the equation here for the...

2 months ago | 1

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Answered
Why is my MATLAB video such poor quality?
@Walter Roberson, thank you for the link fix. [Edit: fix spelling.] @Mitchell Tillman, I would definitely explore the possibi...

2 months ago | 0

Answered
A problem about subcarrier spacing of ofdm
@lc, The error you report is because the variable x has not been defined. You will need to provide more context in order to re...

2 months ago | 0

Answered
Estimating Initial Delay Values for NARX System Outputs in Real-World Applications
@Sandeep, To get an initial estimate for delay, I would compute the cross correlation of the input and the output. If you are ...

2 months ago | 0

Answered
Understanding AIC Values for Best Model
@Alyssa, Those negative AICs should be positive. Simple interpretation is to take the model with the lowest (positive) AIC. ...

2 months ago | 0

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William Rose

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