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Star Strider


Last seen: Today Active since 2012

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.

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Answered
how can i extract the last two digits of a big number e.g 2454152
One approach — number = 2454152; Out = rem(number,100) .

7 hours ago | 1

Answered
Calculation of rise time of skin conductance data
The data are certainly available, however making sense out of them is difficult. Is there a time vector? The risetime func...

7 hours ago | 0

Answered
Check for coordinate pairs matches in .mat file
If I understand the problem correctly, the ismember function may be appropriate — List = randi(9, 10, 2) toMatch = randi(9, 1...

8 hours ago | 1

Answered
How to store images in an array ?
I’m not certain what you’re doing. I’ve not done anything similar in a while, however see if the getframe function will do wh...

10 hours ago | 0

Answered
Why isnt plot working for this code?
It will work with the for loop if (1) the plot call plots points instead of lines, or (2) if the values are subscripted inside t...

12 hours ago | 0

Answered
Approximating sharp changing time dependent term for use with ODE solver
The documentation secion on ODE with Time-Dependent Terms uses interp1 that also has a number of different methods to do the int...

15 hours ago | 0

Answered
Solve equation with multiple values for V
Another approach — Vr = 12; Vi = 3; Pr = 5000; syms n V = [3;3.5;4;4.51;5;5.5;6;6.5;7;7.5;8.01;8.5;9;9.5;10;10.49;10...

15 hours ago | 0

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Answered
How to extract data with multiple headerlines locations, with a differing number of headerlines per file?
My apologies, however this has to be the most inelegant code I ever wrote. It has the virtue of being able to read the posted...

22 hours ago | 1

Answered
How can i replace a string to a numeric value in a specific column of an array ?
I am not certain if ‘string’ refers to character vectors or string variables. Try this — column = ['M';'B';'M';'M';'B';'B']...

1 day ago | 0

Answered
Finding the turning point on the left side of a peak
‘... the turning point on either side of the major peak’ Those are referred to as the Q and S deflections (or waves). Th...

1 day ago | 0

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Answered
Help. Plot graph calculation
A somewhat more analytic representation — x = linspace(-1, 3, 250); y = (x).*((x >= 0) & (x < 1)) + (2-x).*((x >= 1) & (x < 2...

1 day ago | 0

Answered
Changing color of plot
Alternatively, using logical indesing — x = -10:.01:10; y = sin(x); dy = gradient(y); ...

1 day ago | 0

Answered
Solving for angle (Beta) using vpasolve
That’s the result I get when I solve it (and then correct it by ) — M1 = 3; P1 = 1; theta2 = 5; thetha3 = 20; gamma = 1....

2 days ago | 0

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Answered
extract especific rows from matrix
One option — c = [202002041000 25 202002041015 35 202002041030 54 202002041045 ...

2 days ago | 0

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Answered
How can I get a time versus amplitude graph from the waveform.
The spectrogram function returns amplitude (the ‘z’ axis of the rotated surf plot) in units of dB/Hz, so it will not produce the...

2 days ago | 0

Answered
Issue with Quiver plot
I have absolutely no idea what the desired result actually is. One option: negate ‘x2’ Another option: set(gca, 'XDir','r...

3 days ago | 0

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Answered
How to use duration data in the x axis of a patch graph?
Post the code and post the MATLAB version you are using. Only in the last 2 releases (that I am aware of) has patch supported d...

3 days ago | 0

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Answered
smooth step function with rise time
It occurred to me that one option would be filtering the original signal to ‘round off’ the sharp transitions. I first tried a ...

3 days ago | 0

Answered
What do I do next to solve for m?
The conditions only apply if the values of the constants are not defined first. Try this — syms f m g L I f = sym(0.1); ...

3 days ago | 1

Answered
dirac() and ode45 issue
I doubt that the dirac call is actually necessary. The code works correctly without it — tspan1 = 0:0.00000001:0.01; x0=...

3 days ago | 0

Answered
Trouble with symbolic integrals
Since the desired result is numeric, use vpaintegral — syms x; f = exp((x^2-1)/2)/(1-x^2)^0.5; int_f = vpaintegral(f,-1,1)...

3 days ago | 0

Answered
Plot figures in the same figure (MATLAB)
Add the second matrix to the code, concatenate it with ‘H’ along dimension 3, then use a for loop to address and plot them. H...

3 days ago | 0

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Answered
How to extract symbolic parts and corresponding constant values with division in symbolic polynomials?
I cannot find any function that would return the desired result, however ther are other options, a few of which are — syms x...

4 days ago | 0

Answered
How to plot multiple y values for a single x value
The plot function figures this out automatically — A = randn(512,10); x = 1:10; figure plot(x, A, '.') xlim([0 11]) ...

4 days ago | 0

Answered
INDEX IN POSITION 1 EXCEEDS ARRAY BOUNDS (MUST NOT EXCEED 3)
These — for i = 1 : n Sum = 0; for j = 1 : n should instead be — for i = 1 : size(a,1) ...

4 days ago | 0

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Answered
find the intersection of the four corner and trim the value out of the corner
Solve for the intersections, then plot to those limits — grid on syms stress1 stress2 shear12 SL_Ts=1800; SL_Cm=1400; ST_T...

4 days ago | 0

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Answered
Integration of a function having constant parameter
Try this — syms a x F = int((4*a - 2*x + 4*a*x - 3*a*x^2 - 2*a*x^3 + a*x^4 - x^2 + x^3), x, 0, 1) Ffcn = matlabFunction(F) ...

4 days ago | 1

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Answered
plot nonlinear equation in x y coordinate
Try something like this — syms x y SL_Ts=1800; SL_Cm=1400; ST_Ts=40; ST_Cm=230; SLT=100; k=((x^2/(SL_Ts^2))-((x*y)/...

4 days ago | 0

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Answered
Interpolated contour plot with excel data
I’m guessing as to what ‘x’ and ‘y’ are, however it will be easy to reverse them if I guessed wrong. T1 = readtable('https...

4 days ago | 0

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Answered
Plot scatter plot as shade
Try this — LD = load('conc.mat'); conc = LD.conc; t=[0;30;60;120;300;600;900]; figure plot(t, conc) hold on shadeWidth...

4 days ago | 0

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