# 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**

Why is the line over imagesc not where I expected it to be?

The image functions such as imagesc reverse the y-axis direction. Experiment with: set(gca, 'YDir','normal') to see if tha...

circa 15 ore fa | 0

How do I fit a curve to the peaks of the data?

The approach depends on the result you want from the curve. If you want parameters, then findpeaks or islocalmax will be nece...

circa 15 ore fa | 0

intersection from a plot and loop

clear all; close all W_takeoff = 10000; W_landing=6000; S = 20; AR = 5; cd0 = 0.02; k = 1/pi/AR; RC=0.51; clalpha = ...

circa 18 ore fa | 0

How can I add linspace in a For Loop

There is not enough information (such as a description of what you want to do). However one possibility is something like thi...

circa 20 ore fa | 0

Plot a function of three variables on a surface plot

If all the data are vectors (that would appear to be true since ‘x’ is a vector), it would be necessary to use either the gridda...

2 giorni fa | 0

How can I animate springs in MATLAB?

One approach — L = 1600; % Vector Lengths t = linspace(0, 16*pi-(1/L), L); ...

2 giorni fa | 0

| accettato

differentiate between month in dataset.

Perhaps something like this — secondsperyear = 60*60*24*365; DT = datetime(2023,1,1,0,0,0) + seconds(0:secondsperyear-1).'; ...

3 giorni fa | 0

Hot plate PID control according to measured graphs

I took another look at this, however this time using the second file. (This same approach will likely work on the first file as...

3 giorni fa | 0

To obtain the cumulative signal power spectrum from the single-sided spectrum of a biomechanical signal to identify the frequency under which 99% of the signal power is

I cannot find a time vector or sampling frequency. I need at least one of those. The article is open-source, however not ill...

3 giorni fa | 0

Using rlocus I am confused

You appear to be overthinking it. Try this — G = tf([1 1], conv([1 2 2], [1 2 5])); figure rlocusplot(G) grid % title...

3 giorni fa | 0

| accettato

nlarx is not working at all

Check to see if you have another function (or something else) with the same name. To do that, run this: which nlarx -all f...

4 giorni fa | 0

| accettato

Why am I getting the same colour of the legend for the last 2 plots?

I suspect that it is because ‘y2’ has more than one row. The solution is to return the handles of the plots, and select only ...

4 giorni fa | 0

| accettato

Choosing dimension for filter

I believe so. From the filtfilt documentation for x: ‘The function operates along the first array dimension of x unless x i...

4 giorni fa | 0

How to draw the delta signal in matlab

The function normally will not plot in MATLAB because it has infinite amplitude and infinitesimal width. So it is necessary ...

4 giorni fa | 0

Problem during the use of 'fzero'

I am not certain what you want to do. I suspect that you want to loop over varying values of ‘t’ however ‘t’ never appears as...

4 giorni fa | 1

| accettato

Extracting datetime and adding reference time

This was a bit more involved than I theught it would be — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uplo...

5 giorni fa | 0

3 subplots with the bottom one split in 2 vertically?

Perhaps this — clearvars x = -10:0.01:10; y = cos(x); figure(1) subplot(2,2,[1 2]) plot(x, y) subplot(2,2,3) plot(x,...

6 giorni fa | 0

| accettato

Why is my "plot" function not working?

Use the str2double function on the last four variables. EDIT — (26 Mar 2023 at 10:28) T = readtable('https://www.mathworks...

6 giorni fa | 0

| accettato

what test to use on z-scores

Since the zscore is simply a standardised method of expressing data, and if the mean values and standard deviation (std) values ...

7 giorni fa | 0

| accettato

Using the surf and meshgrid command

I am not certain what function you want to plot, since you did not create ‘z’ as a separate matrix. (I am creating it here in p...

7 giorni fa | 0

| accettato

How do I save a data in my excel to matlab folder, i e how do i create a path to matlab folder

I am not certain whether you want to read from the Excel file or write an Excel file from data you have created. Depending on...

7 giorni fa | 0

| accettato

Displacement from acceleration measurements

The slopes are due to a constant that is being integrated can be removed by subtracting the mean of the variable to be integrate...

7 giorni fa | 0

Change rlocus() axis units to Hz?

First, use rlocusplot since it allows options — sys = tf([2 5 1],[1 2 3]); hrlp = rlocusplot(sys); opts = getoptions(hrlp) ...

7 giorni fa | 1

| accettato

Problems with signal processing

For a time-frequency plot, I would use the pspectrum function with the 'spectrogram' option, at least for an initial approach, a...

8 giorni fa | 0

Plotting Level Curves after function

Use the contour function. You can use fcontour, however it will not be possible to export its results to plot with contour. ...

8 giorni fa | 0

How can I line up plot edges in subplots?

I was hoping that the 'Position' (actually 'InnerPosition') of the first and last subplot axes would automatically be set correc...

8 giorni fa | 0

| accettato

Sine curve fitting in MATLAB

@M — I was in the process of answering this when Win 11 crashed. Again. For the fifth time in two days, and three times when I...

8 giorni fa | 0

why am I getting the error "Incorrect number or types of inputs or outputs for function 'solve'."

For equality inside a symbolic expression, use double equal signs (==) — syms d e s=solve(7*d + 3*e == 71,d + 2*e == 20); s...

9 giorni fa | 0

| accettato

Plot complex signal with imaginary and complex

This is relatively straightforward — Fs = 1000; Tlen = 10; t = linspace(0, Tlen*Fs, Tlen*Fs+1)/Fs; s = exp(1j*t*2*pi); R...

9 giorni fa | 0

| accettato

Plotting 3D by rotate 2D plot around y-axis

Probably the easiest way is to define a cylinder and a shape vector — yv = [linspace(0.3, 1, 50)]; ys1 = yv.*exp(-1.75*yv)*5;...

9 giorni fa | 2

| accettato