Star Strider

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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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Feeding a variable in a set of ODEs from an external nested for loop
It is difficult for me to follow what you are doing. I would create the ‘q_T_values’ and ‘q_b_values’ calculation as a separa...

etwa eine Stunde vor | 0

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I can't run wavedec2() - 'unrecognized function or variable'
You may be having path probleems. Run these: restoredefaultpath rehash toolboxcache from a script or your Command Windo...

etwa 2 Stunden vor | 0

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time series fitting to statistical moments
‘where a and sigma are unknown parameters’ Beyond that, I am clueless as to any appropriate way to do this parameter estimation...

2 Tage vor | 0

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Distinguish the different curves and identify the points corresponding to each way
Another approach, using the stackedplot (introduced in R2018b) function — T1 = array2table(10*(rand(100,5)+(4:-1:0)), Variable...

2 Tage vor | 1

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Why i get error message when trying using lowpass?
Since it seems to be installed, you may be having path problems. Run these from a script or your Command Window: restoredef...

3 Tage vor | 0

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Can I set a datetime locale for readtable in a script?
Note that "dd/MM/yyyy :hh:mm:ss" uses 12-hour format (using hh for the hours) without the AM/PM indicator. To use 24-hour forma...

4 Tage vor | 0

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Image Processing Toolbox not found despite being installed
Run these from a script or your Command Wiindow: restoredefaultpath rehash toolboxcache If that still does not solve tthe p...

4 Tage vor | 0

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3d lines plot
Peerhaps something like this — t = linspace(0, 1).'; x = sin(2*pi*t); y = cos(2*pi*t); z = x+y; figure plot3(x, y, z) ...

4 Tage vor | 0

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Potential flow past an airfoil
Check the File Exchange. When I did and searched on ‘airfoil’, I found: Plot Pressure Distribution (Cp) Over an Airfoil / Aer...

5 Tage vor | 0

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Forcing robustfit to return an intercept
Note that ‘Y’ is single precision. MATLAB defaults to the lowest precision, so casting it as double produces a non-zero interce...

5 Tage vor | 0

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How can I extract specific weather data from a 3D grid?
Without even representative data, I’m not certain even how to simulate this. I would use the scatteredInterpolant function fi...

6 Tage vor | 1

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ODE time vector plot does not correspond to the time vector values
We don’t have your ‘ode_arm’ function, however it may be that ode23 is encountering a singularity () at about 0.9 time units, an...

6 Tage vor | 0

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Alternative to ginput for finding curve intersections with unevenly spaced data in MATLAB
Another approach — x = [linspace(0, 2.4) linspace(5.2, 7, 8)].'*1E-3; y1 = [x(x<=2.4E-3)*580/2.4E-3; 500*ones(size(x(x>2.5E...

8 Tage vor | 1

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Plot: Dots won't go higher than y=0
If you add: set(gca, 'YScale','log', 'YLim',[10 1E+8]) you will see that the green dots plot appropriately. The y-axis limit...

9 Tage vor | 0

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Extracting number after a string in header of CSV file
One approach — C1 = readcell('DummyData.txt') str = {'Memory Length','Horizontal Scale','Sampling Period'}'; idx = cellfun(@...

9 Tage vor | 0

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Plot the function on graph
Consiider fplot. I have n o idea what ‘forina’ refers to, however the rest is straightforward — b = 2; y = @(x) sqrt(9*x +...

9 Tage vor | 0

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Load data into the "System Identification Toolbox"
Since you have time-domain data, use the iddata function to prepare it for the identification function of your choice. (I prefe...

10 Tage vor | 0

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Extracting Zoomed in part of curve and finding rising Edges of data
Depending on the result you want, it might be easier to use islocalmax for this — T1 = readtable('DS0007_REDUCED.CSV') t = ...

12 Tage vor | 0

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How to print array value and it's undex?
It would be necessary to print the indices as well — data(6500:6503,:) = [100 105 10...

13 Tage vor | 0

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How to make color axis ticklabes with two end limits ([cmin cmax]) only?
One problem may be that your clim call (at least as posted) needs parentheses. This call to clim: cl = clim; should retur...

13 Tage vor | 0

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Horizontal Freestream Flow Issues With Symbolic Math Toolbox
The ‘ZData’ matrix from the symbolic code appear to be transposed with respect to ‘psi_vals_fs’. This is likely due to the assu...

16 Tage vor | 0

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Help with making an Ellipse Area function
The only error I can see is that you need to assign something to the ‘area’ variable in your ‘EllipseArea’ function. I assign...

16 Tage vor | 1

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I'm trying to plot a mat file with a 1x1 structure, but it's giving the error that "Index in position 2 exceeds array bounds. Index must not exceed 1."
When you load into a variable, that creates a structure. The information you want will then be in that structure. data1 = lo...

16 Tage vor | 0

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automating many column headings in table
Perhaps something like this — A = randn(5,10); T1 = array2table(A, VariableNames=compose('physical state at step %4d',1:size(...

17 Tage vor | 0

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Finding specific peaks and valleys
To find specific valleys, one option might be to use the MinPeakProminence value. The prominences are the tthird output returne...

17 Tage vor | 0

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How can I plot multiple figures in one from multiple saved .fig files that have 2 figures but I only want 1 of them?
It would help to have at least one of the .fig files to work with. In general, use the openfig function to open each file. T...

17 Tage vor | 0

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How do i calculate the standard deviation from multiple csv files where i would like the standard deviation for each second?
Perhaps this — Time = datetime('now')+seconds(0:2).'; Time.Format = 'H:mm:ss'; Temperature = [20.754 19.219 19.338 20.89; 20...

17 Tage vor | 0

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Convert Set of (x,y) Coordinates Into Polygon
Try this — LD = load('coordinates.mat') coordinates = LD.coords; shp = alphaShape(coordinates(:,1),coordinates(:,2),'HoleT...

18 Tage vor | 2

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Compare two irregularly sampled, noisy sinusoidal signals
Use the nufft function for irregularly-sampled data. Beyond that, ‘similarity’ is a somewhat amorphous concept. I did a line...

18 Tage vor | 1

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Multiple regression with nonlinear variables
I am not certain what you want to do. Fitting a generalized additive model (GAM) for regression using the fitrgam function wo...

18 Tage vor | 1

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