# Star Strider

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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**Content Feed**

Legend command not working when plotting figure

I am surprised that the legend call did not throw an error. It did when I tried to run the code: ElectronEnergy = (1:100:1000...

9 hours ago | 0

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How to mark labels on sampling points

I have no idea what you want to plot. Try this — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_f...

1 day ago | 0

How can I resample data with multiple time column?

One approach — M = [ 19 1 1 0 0 0 1009.4 28.9 71.0 0.0 0.0 0.0 0.0 19 1 1 0 0 30 1009.4 28.8...

1 day ago | 0

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How to find x value for a known y in array plot?

Possibly: idx = find(diff(sign(y - 0.8*max(y)))); xvals = x(idx) That should find the closest indices to all of them.

2 days ago | 0

how to connect the upper points of a sine curve by making them a curve?

Use the envelope function (R2015b and later) in the Signal Processint Toolbox. Perhaps: envup = envelope(y); The function ...

2 days ago | 1

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Not getting curve in my graph

‘Any ideas?’ Yes. Subscript ‘theta’ and all the argument vectors using the loop index ‘i’ rather than ‘n’. n=100; s=ze...

3 days ago | 1

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how to get decimal answers?

If you are using the Symbolic Math Toolbox, use the double function if the expressions do not contain symbolic variables. If th...

3 days ago | 1

Plotting 5 different filled markers on one graph

If you don’t need lines connecting the points, use the scatter function. It has a 'filled' option to automatically fill the mar...

3 days ago | 0

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How to read a .dat file containing an ECG signal?

PhysioBank used to be much friendlier than it now is. I have no idea what records you’re interested in, however the easiest w...

4 days ago | 0

Write multiple variables from a function

sw_sats is a 7071x200 array co2_sat is 7071x200 array k_brine is a 1x1500 array Kb is a 1x1500 array That means that ‘Sw’ ...

4 days ago | 0

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Change value based on the values of another column

Another approach — v = [-0.00554 -0.00503 -0.00406 -0.00406 -0.00316 -0.00274 -0.00274 0 0 0 0 0 0 0.00233 0.004...

4 days ago | 0

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problem in creating plot from for loop

The value of ‘t’ is the last value in the loop, and the intermdiate values of ‘vs’ are not saved, so the result is only one valu...

4 days ago | 1

Heat map from csv data

It looks like a surf plot viewed from the top. Try this — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/u...

5 days ago | 1

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Shade area between two lines on a plot - max., and min., values

It would help to have the data. This is straightforward using the patch function — x = linspace(0, 110).'; ...

5 days ago | 1

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Convert a time string to double

I am not certain what you are doing, however the isbetween function (that does not require conversion out of datetime) may be wh...

5 days ago | 0

fprintf use with error

It looks as though you want to print a percent (%) sign. Try this — fileID = 1; ...

5 days ago | 1

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How can I apply filer for three signal using matlab

If they all have the same sampling frequency and are the same lengths and the same filtering requirements, concatenate them as c...

5 days ago | 0

How to display interval data on x axis in histogram plot (eg. 10-20, 20-30,...) ?

Try this — x_ax_data = ["10-20", "30-40", "50-60", "70-80", "90-100"]; % Create String Vector y_ax_data = [0, 0, 200, 550...

6 days ago | 1

I have problem in solving ode45

The principal problem appears to be having 2 differential equations and 1 initial condition. Try this — w=2*pi; zeta=0.25;...

6 days ago | 0

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How to build up linear functions in MATLAB and plot the?

The lilnes are easy enough to plot — xm = [0 0.04999; 0.05 0.24999; 0.25 0.6]; ym = [0 0.25; 0.3 0.55; 0.6 1]; for k = 1:s...

6 days ago | 1

Get the filename of a loaded file

Save the fille name as a string or character array first, then refer to it as any other variable — filename = '\Data_record_fi...

7 days ago | 1

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How to plot this function

Force the NaN value at (0,0) to be 0 — [X,Y] = ndgrid(linspace(-5,5,50)); Z = (X.^3.*Y - X.*Y.^3)./(X.^2+Y.^2); Z(isnan(Z)) ...

8 days ago | 0

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How to read excel data include specific word? cell?

Try this — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1085430/kpmarch.xlsx') Lv = ismem...

8 days ago | 0

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Basic 2D-contour plot

One optiono is to use the first column and first row as the appropriate coordinate vectors, and then the rest of the matrix as t...

8 days ago | 1

Filtering Data which not function of time

The data being filtered do not have to be functions of time. They can be functions of anything, so long as the sampling interva...

8 days ago | 0

Operator '.^' is not supported for operands of type 'cell'

The original problem was caused by using curly brackets {} around the 4: A=(-(vss.*c.^2)./(ks.^2))+((Vs.*K.*gamma.^2.*ct.^2)./...

9 days ago | 0

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how to fit an exponential curve to my signal in a plot?

It would help to have the signal. There appears to be high-frequency noise, so the first step would be to calculate the one-si...

9 days ago | 1

plotting X and Y coordinates over time

The data were not supplied, however it quite probably works correctly. You are asking it to do a linear interpolation, probably...

9 days ago | 0

how can I solve this problem

I have no idea what you want, especially with two expressions for ‘sm’ and several variables undefined, so taking a wild guess —...

9 days ago | 1

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Exponential curve fitting with nonlinearleastsquares methood

Use a different vector for ‘StartPoint’ and then experiment — Xk = [800; 1000; 1490; 2000; 2510]; Yk = [590; 720; 970; 1190...

9 days ago | 0