Community Profile # Star Strider

Last seen: Today 2012 以来アクティブ

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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smoothdata function not working for matrix . any one have ideas to what is going on?
Try this — LD = load('mat.mat'); a = LD.a; for k = 1:size(a,2) a_smoothed(:,k) = smoothdata(a(:,k)); end x = 1:si...

problem with fit function for data
The fit function requires column vector arguments. Force that sith the ‘(:)’ subscript noitation. E = [416.861, 818.7, 109...

How to use one marker for looped plots in legend
I cannot run the posted code, however the solution may be straightforward. figure hold on for k = 1:50 hs{1} = scatter...

fit 2nd order differential equation parameters to data
The problem appears to be not allowing the intial conditions to be estimated as parameters as well as the initial value of ‘a_m’...

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Using solve to find intersection points
It’s as simple as it looks — syms x f(x) = exp(-x^2) g(x) = sym(0.8) xi = solve(f == g) xi_vpa = vpa(xi) .

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How can I simplify the folllowing equation
One approach — syms x Eqn = 2*x^2 - 2*x*(2*x^2 - 1) + 2*x*(2*x*(2*x^2 - 1) - 2*x^2 + 1) - 1 Eqn = simplify(Eqn, 500) .

1日 前 | 0

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How to plot data with two different X- axis in a single plot?

2日 前 | 0

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translating and solving an equation with values of x and y known
In the third term, the square root is of the numerator only, not the entire expression, amd the denominator does not appear to h...

2日 前 | 0

To determine whether the system is stable.
Welcome to the wonderful world of floating-point approximation error! See ‘Check’ and ‘Check_max’ for an illustration of the ...

3日 前 | 1

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How to properly format a data table with fprintf?
In the numeric edit descriptors, the value to the left of the decimal is the field width (this includes all the numbers, the sig...

3日 前 | 0

Find which matrix row contains average minimum value
One approach — M = rand(288,365); AMV = mean(min(M)) % Average Minimum Value [val,idx] ...

3日 前 | 0

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trying to find theta
The Question lacks clarity. % plot mountain Mn_x = [0, 1000, 3014.8]; Mn_y = [0, 0, 616]; plot (Mn_x, Mn_y) hol...

3日 前 | 0

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Solve for x given y and plot
Depending on what you wan, either use fzero or interp1 — y = @(x) (2 * exp((2*x)/3)) - ((7*x.*exp((2*x)/3))/3); x = linspace(...

3日 前 | 0

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Doubt in solving ODE45
It seems that ‘dis’ does not appear anywhere. L=20; v=20;%v (m/sec) T=L/v; tspan_1=[0:0.001:T];%time range y0_1=[0;0];...

3日 前 | 0

How do you plot a line of constant value on a surface plot?
See if contour3 or contour3m will do what you want. [X,Y,Z] = peaks(30); figure surf(X,Y,Z) hold on contour3(X,Y,Z,[1 1...

3日 前 | 0

How to properly create function for integration?
There are several problems with the posted code image. First, ‘z’ is not defined anywhere, and it is not an argument to ‘E_fu...

3日 前 | 0

How can I plot the derivatives of the components of the solution to a system of ODEs?
The only way is to use al loop — tspan = [0 50]; z0=[0.01 0.01 0.01 0.01]; [t,z] = ode45(@(t,z) coupled(t,z), tspan, z0); ...

3日 前 | 2

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Cannot calculate integral function
If you want a numeric result, use vpaintegral (introduced in R2016b) instead of int. Not all expressions have analytic integral...

3日 前 | 0

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How to convert logarithmic to linear
If you have the Signal Processing Toolbox, use the db2mag function. If you do not have it: dB2mag = @(dB) 10.^(dB/20); ...

3日 前 | 0

Matlab Polar Plot Legend does not match with the plot
I cannot run that and I amm not certain what you are are plotting. Create a handle for each polarplot call: th = linspace(0, ...

4日 前 | 0

How to save output of double loop as a matrix?
Since ‘A’ is a matrix, save it as a cell array — for i=1:m for j=1:n A{i,j} = myfunction(...) end end .

4日 前 | 1

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There are NaN values in ‘x’, ‘y’, and ‘sd’. This ia frequent cause of patch failures. Remove them and it works! Try this ...

4日 前 | 1

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3D Sphere projection in Matlab
I worked on this for a while yesterday, without success. Today, I used a relatively straightforward approach that simply flips ...

4日 前 | 1

How would I go about writing this equation in matlabs?
There are several options, depending on what you want to do. syms x p(x) = 1/(2*sqrt(sym(pi)))*exp(-(x-5)^2/4) figure f...

5日 前 | 0

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How to save .mat file into hdf5 in matlab?
I have no recent experience with HDF5 files, however the h5write documentation for data indicates that it must be a numeric matr...

5日 前 | 0

Error with plotting my function
It works if you give ‘f’ a vector to work with — f = @(x) 2.^x-5*x+2; %Given Function xaxis = [0:0.5:2]; ...

5日 前 | 2

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I am trying to plot an ellipse using a polarplot function.
The polarplot function requires the angular measure to be in radians. Change that in the polarplot call and it works. (The e...

5日 前 | 0

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Am I using corrcoef correctly?
‘Am I using corrcoef correctly?’ Yes, except for squaring the result, and that will produce . H=log([0.01 0.02 0.03 0.04 ...

5日 前 | 0

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Converting a linear equation to decibel
The ‘theta’ vector likely needs to have more points, however that appears to be correct. I use a slightly different approach ...

5日 前 | 0

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Sampling frequency and correct signal plotting
I believe this is simply an interaction of the sampling frequency and the signal frequency, typically referred to as ‘aliasing’....

5日 前 | 0

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