Star Strider

Last seen: Today | Active since 2012

Followers: 0 Following: 0

Message

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)

Statistics

All

View badges

Feeds

Answered
Trying to combine two IR spectra where x is wavenumber (cm-1) and y is transmittance (0 to 1), having trouble.
It would help to have the data. The best way is probably to interpolate the longer series to the length of the shorter series...

3 hours ago | 0

Answered
Tornado chart with colormap gradient
Perhaps something like this — % Data data = [0.496; % Electrical conversion efficiency 0.426; % Biogas efficiency val...

5 hours ago | 0

Answered
I'm trying to find displacement from acceleration datas
Your original ac celeration data have a trend, and you are integrating the trend. Use the detrend function tto remove it (alter...

7 hours ago | 0

Answered
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...

23 hours ago | 0

Answered
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...

1 day ago | 0

Answered
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 ...

1 day ago | 0

Answered
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...

1 day ago | 0

Answered
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...

1 day ago | 0

Answered
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

Answered
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

| accepted

Answered
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

Answered
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...

4 days ago | 1

Answered
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(...

4 days ago | 0

Answered
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 ...

4 days ago | 0

Answered
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

| accepted

Answered
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...

5 days ago | 1

Answered
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(...

5 days ago | 0

Answered
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...

5 days ago | 0

Answered
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...

5 days ago | 0

Answered
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; ...

5 days ago | 0

Answered
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

Answered
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

Answered
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...

6 days ago | 0

| accepted

Answered
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, ...

6 days ago | 0

| accepted

Answered
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. ...

6 days ago | 0

| accepted

Answered
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

Answered
an ode with arguements
You have five differential equations and three initial conditions. The initial conditions vector must have the same length a...

7 days ago | 0

Answered
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

Answered
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(...

8 days ago | 0

Answered
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...

8 days ago | 0

| accepted