# 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**

Fitting an anonymous function: Debye Callaway Model

I do not have your data so I cannot run your code. However it is always appropriate to compltely vectorise objective function...

3 hours ago | 0

How to Reshape a Matrix into a Cell

Transpose the row vector, call reshape, then transpose that result — syms R11 R12 R13 R21 R22 R23 R31 R32 R33 k = 1; timest...

7 hours ago | 0

Curve fit autocatalytic model

if ‘x’ is greater than 1 and ‘n’ is not an integer, the result will be complex. Example — k = rand m = rand n = rand x ...

9 hours ago | 0

fsolve function not solving nonlinear equations, I had observed "Invalid datatype. Options argument must be created with OPTIMOPTIONS"; could you assist me, pse

One problem is that fsolve wants the initial parameter estimates as a single vector, and the third argument is the ‘options’ str...

14 hours ago | 0

apply hanning window for signal processing

I do not understand your code, so I am not certain where to suggest adding the hann call in that context. (I specifically do no...

15 hours ago | 0

How to assign new variables?

Use the strrep function instead of the if block — jj = 1; dependent_vars{jj} = 'act_per_ha'; jj = 2; dependent_vars{jj} = ...

3 days ago | 0

Latex, sprintf and variable that changes

Your sprintf statement has fields for 3 variables, however you only provide 2. Provide all 3 and it works — i = 1; j = 1; ...

3 days ago | 0

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Why I have the error Genetic algorithm script error no Global Optimization Toolbox ?

You have to license, download and install the Global Optimization Toolbox. There is no separate license for gamultobj. You m...

3 days ago | 0

I need to plot precipitation data. First, adjust y limits of a stacked plot to accommodate totals for the month. Second, have dates on the x axis.

Convert the table to a timetablee and ‘Column2’ will automatically be plotted as a funciton of the time variable. However I d...

3 days ago | 1

How to get the Z-transform and tf of this function y[n] = 0,5y[n − 1] + x[n] ?

Perhaps something like this — syms n x(n) y(n) z t X(z) Y(z) assume(n>=0 & in(n,"integer")) Eqn = y(n) == 0.5*y(n - 1) + x(...

3 days ago | 0

Finding and integrating peaks in a data array

The findpeaks function will accurately locate the peaks. Integrating them depends on what you want to do. In the past, I have ...

3 days ago | 0

Finding length of time in between peaks.

I already addressed this in my Answer to your previous question on exactly the same topic. If you are having problems with it...

4 days ago | 0

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whats wrong with this code?

It works here. How are you calling your ‘aero_drag’ function? dens = rand v = rand A = randn(1,5) drag = aero_drag(de...

4 days ago | 1

usage of ode45

imshow(imread('WhatsApp Image...16.45 PM.jpeg')) syms M(t) I_1(t) I_2 V(t) t g mu A Y T Eq1 = diff(M) == -g*V*A Eq2 = diff(...

4 days ago | 0

find function not working with double inequality

The problem is in the ‘indf’ logic: indf = find(signal_freq-b<CenterFreqs<signal_freq+b); That performs the first comparision...

4 days ago | 0

Identifying PTT of ECG and PPG signals

Without your data, it is going to be nearly impossible to suggest an approach to this. Also, without your data, it is impossibl...

4 days ago | 0

Matlab fft plot axes

This would be my approach — Fs = 1000; Fn = Fs/2; L = 60; t = linspace(0, Fs*L, Fs*L+1).'/Fs; ...

4 days ago | 0

Omit nans from data set when calculating weights

Since NaN values are considered to be ‘missing’, to remove them from a specific vector (or matrix), you can use the rmmissing fu...

5 days ago | 1

Can anyone explain the difference in results for rainpl function between R2016b and R2021a?

The earliest available online information on rainpl is R2019a, so any changes between R2016b and R2019a are unavailable. (I don...

5 days ago | 0

how to plot time and frequency domain by using FFT from CSV file?

Try this — A = readmatrix('FILE060.CSV'); Asz = size(A) t = A(:,1); s = A(:,2:end-1); figure plot(t, s) grid xlim([m...

5 days ago | 0

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Delete rows in a given array based on values in another array

Perhaps this — A = randi(99, 50, 1); Abfr = buffer(A,10) % Show Everything In 'A' B = randi(99, ...

5 days ago | 0

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How to move the position of 2D projection of a 3D plot along the Z axis of the same figure?

Use surfc instead of surf, and then make appropriate changes to 'ZLocation' and 'FaceColor' in the contour part of the plot. ...

5 days ago | 0

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Error using sym/matlabFunction>getOptions "Invalid Values"

As noted, the right-hand-side of ‘ode’ is 0, and that is not actually a differential equation. The left-hand-side is. The mi...

6 days ago | 0

an ode with arguements

You have five differential equations and three initial conditions. The initial conditions vector must have the same length a...

6 days ago | 0

Identify point in signal where it moves away from zero

Your signals are difficult to work with. That there are several together makes this more challenging than it might otherwise ...

7 days ago | 0

bar of mean of last 3 entries for 2 data sets

It would help to have your data. Perhaps something like this — Data1 = randn(30) + randn(30,1); Data2 = randn(30) + randn(...

7 days ago | 0

How to display a 150x150x150 matrix?

There are too many to plot here, so I only plot every 10 (of 150). Try this — Uz = unzip('microint0.mat.zip'); LD = load(U...

7 days ago | 0

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Combining multiple rows from one matrix to another matrix

Use the reshape function — P=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 ...

7 days ago | 0

How do I fix the error "Execution of script interp2 as a function is not supported"?

You have a script that you named ‘interp2’ and that is throwing the error. The solution is to re-name the script to something...

8 days ago | 0

Make a surface plot

Creating surface plots from your data is straightforward using the scatteredInterpolant function. Once the ‘Cm’ matrix is creat...

9 days ago | 0