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Star Strider


Last seen: Today |  Con actividad desde 2012

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Hic sunt dracones! PROFESSIONAL: Physician (M.D.): Diplomate of the American Board of Internal Medicine; M.Sc. Biomedical Engineering: Instrumentation, Signal Processing, Control, System Identification, Parameter Estimation NON-PROFESSIONAL: Amateur Extra Class Amateur Radio Operator; Private Pilot, Airplane Single Engine Land, Instrument Rating Airplane; Gamer NOTE: I do not respond to emails or personal messages, unless they are about my File Exchange contributions. Time Zone: UTC-7 (Standard); UTC-6 (Daylight Savings/Summer)

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Respondida
Concatenating a signal given its segments' limits
A different approach — ww = [10 15 16 22 33 44 45 50 51 60 70 80]; N =...

alrededor de 3 horas hace | 0

Respondida
How do I open .bin file and transform data to .txt file
A ‘4-byte float’ is probably 'float32' (possibly 'real*4'), so one of those should work for the ‘precision’ argument in fread. ...

alrededor de 14 horas hace | 0

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Respondida
12 Lead ECG Problem
See Detecting QRS complex in ECG signal and how can I get cardioid graph from ecg QRS complex? for representative examples.

1 día hace | 0

Respondida
Unrecognized function or variable 'knnimpute'
If you installed the Toolboxes using the installer, MATLAB should be able to access them. Your posted code works here — dat...

1 día hace | 0

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Respondida
How do I find the minimum between a matrix and a varying matrix function? I get "Error in fmincon (line 563) initVals.f = feval(funfcn{3},X,varargin{:});"
There is one typo (. where _ should be) in: eps_dried = eps_dried.I3.epsilon; so change that to: eps_dried = eps_dried.I3_e...

1 día hace | 1

Respondida
How to get data points from graph
Getting information from .fig files has changed over the years. This approach works with the most recent releases. Use the f...

1 día hace | 0

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Respondida
unsupervised thresholding of signal amplitudes: MLE?
I encourage you to investigate the ‘prominence’ values of the peaks. This is not a straightforward concept to define (see the f...

2 días hace | 0

Respondida
How to set up a plot with labels but no Y-axis tick marks
Perhaps this — figure boxchart(rand(10)) yt = yticks; yline(yticks, '-k', 'Color',[1 1 1]*0.25) Ax = gca; Ax.YAxis.Visibl...

2 días hace | 0

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Respondida
How can I obtain the difference between two data stored in workspace?
If the two variables have the same number of elements, just subtract one from the other. For example: speed_error = refere...

3 días hace | 0

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Respondida
How to find the frequency and amplitude of an oscillating signal?
One approach — T1 = readtable('book1.xlsx', 'VariableNamingRule','preserve') VN = T1.Properties.VariableNames; t = T1{:,1}; ...

3 días hace | 0

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Respondida
How can I solve this datetick error?
The datetick function uses MATLAB datenum values to calculate and plot the dates and times. A much simpler approach uis to us...

4 días hace | 0

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Respondida
Using fit, which coefficients should I extract to assess differences?
Only ‘c’ and ‘d’ are signifiantly different from zero, since the confidence limits of ‘a’ and ‘b’ include zero (the confidence l...

4 días hace | 0

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Respondida
How the increase the affect of lowpass filter on a field data?
The cutoff frequency of the lowpass filter is too high. Try these — LD = load('T35.mat'); T35 = LD.T35; sampling_interval...

5 días hace | 0

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Respondida
How can I use various colors to fill the area under a normal distribution curve?
Sure! Try this — x = linspace(1.5, 5, 250); mu = 3.3; s = 0.6; y = normpdf(x, mu, s); figure plot(x, y) hold on Lv...

5 días hace | 1

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Respondida
problem of using findpeaks
My guess is that the datetime values are not considered to be monotonically increasing because they span multiple years. Try ...

5 días hace | 1

Respondida
how to open .fdt file
Searching the Interweb (with DuckDuckGo), I found 15.1 How to load EEGLAB .set and .fdt files without using EEGLAB (05/09/2020 u...

5 días hace | 1

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Respondida
How to find duration of peaks/valleys in chart
Try this — T1 = readtable('NV1-9999.csv', 'VariableNamingRule','preserve') VN = T1.Properties.VariableNames; x = T1{:,1}; ...

6 días hace | 1

Respondida
What is the function to use to blacken a region?
Perhaps this — % clear %% Plotting the graphs % We have p(x) = 16 => p(x) - 16 = 0 f = @(x) (800000 .* exp(-x./5000)) ./ (x...

8 días hace | 0

Respondida
why is this not outputting the correct values
There is a syntax error, in that you used a colon operator ‘:’ instead of a comma in the ‘pythtrips’ references. The syntax is ...

8 días hace | 0

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Respondida
Creating an equation with 2 unknowns with Curve Fitting
The question is a bit ambiguous. I do not see where curve fitting (actually parameter estimation) enters into it, because I do ...

8 días hace | 0

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Respondida
Como resolver esta ecuacion
Is there a problem? This works — % Parámetros del sistema m = 45; % masa c = 64; % coeficiente de amortiguamiento k =...

8 días hace | 0

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save a figure in a predefined folder as variable using print
Using the fullfile function may help. You have to supply the necessary information, however fullfile will build the path.

9 días hace | 0

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Respondida
How to plot specified data points on a polar plot with curved lines, instead of straight lines
I am not certain what result you want. The plot image you posted looks like a sort of spline fit, however when I tried a spline...

9 días hace | 0

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Sorting pairs into seperate matrices based on whether they are ascending or descending
The loop is not necessary anyway. Just use ‘logical indexing’ — pairs = [2 8 7 5 6 8 4 7 ...

9 días hace | 0

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Respondida
I have line and want to colour the area behind the line (beyond the x axis) how can I do this
I am not completely certain what ‘behind’ the line means, however from your comments with respect to the x-axis, I guess that yo...

10 días hace | 0

Respondida
Fit experimental data to analytical expression
Equation (3) is a bit mystifying to me. imshow(imread('analytical_expr.png')) imshow(imread('phase_vel.png')) I assume th...

10 días hace | 0

Respondida
Convert a datetime to string
I am not certain what the problem is. To convert [2022 07 17] to your desired format using datetime, try this — DT = dateti...

10 días hace | 0

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Respondida
unexpected discontinuity in graphic
My guess is that the filter is unstable. This occurs relatively frequently with transfer function realiations of filters. I ...

11 días hace | 0

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Respondida
exponential regression functions with error in input values
There are other options, however everyone hass fminsearch, so using it — x = [4; 25; 100]; y = [100; 50; 0]; % objfcn = @...

11 días hace | 0

Respondida
3D surface plot from only scalars
The only difference appears to be that whatever produced the plots in the posted image is using much higher precision and differ...

11 días hace | 0

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