# 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**

How to correctly do a Student Test for atmoshperic data

I’m not certain what you’re doing. I would use ttest2 on the filtered and unfiltered events themselves (since that is how ttest...

ungefär 5 timmar ago | 0

How to edit y-axis scale in pop_spectopo function to log power spectral density 10*log10(uV^2/Hz)

This ‘10*log10(uV^2/Hz)’ is the same a dB/Hz. Thi is the same as the units of the ‘pxx’ outputs of the pwelch and periodogram f...

ungefär 6 timmar ago | 0

| accepted

nonlinear regression for multiple variable parameter

Your code works. The only change required was to create the ‘pressure_Keq’ matrix as the independent variable and then change ‘...

ungefär 9 timmar ago | 0

I need help graphing a function.

It probably should be a decaying sinusoid. The problem is that it decays too fast. Decreasing the magnitude of ‘t’ helps to ...

ungefär 10 timmar ago | 0

| accepted

Find least frequent value in an array

One approach — H = [1 1 2 2 3 3 4 5 5 5]; [Hu,~,uidx] = unique(H, 'stable'); [Out,idx] = min(accumarray(uidx,(1:numel(uidx))...

ungefär 10 timmar ago | 0

Convert array of numbers to an array of padded strings

Use the compose function — stanums = 7:12; stastrings = compose("%02d", stanums) Note the format descriptor string. .

ungefär 12 timmar ago | 0

How to filter a certain range of values

I am not certain what you mean by ‘filt’ since I do not know if you want to keep those values or exclude them. M1 = readmatr...

ungefär 14 timmar ago | 0

Distance between 2 curves from one point

Using interp1 — % Gegebene Daten x = [29.069, 44.395, 59.528, 74.76, 90.036]; y = [0.07091, 0.076187, 0.081665, 0.087588, 0....

ungefär 15 timmar ago | 0

Graphics from 2D data

It would be nice to have ‘x’ since I suspect that ‘x(:,1)’ cycliically repeats. Using reshape to use the cyclic repeat informat...

en dag ago | 0

Bar plot with lower values not fixed

Use the patch function in a loop — x = (1 : 9).'; % Assume Column Vec...

2 dagar ago | 2

| accepted

How to make column vector from existing column vector

Perhaps create a second table. Tzoomed = T(1:1000,:) Then refer to it as you would the original ‘T’ with respect to its var...

2 dagar ago | 0

My graph is not picking up my time increments, its suppose to have a nice curve, but its coming out as a straight line.

Vectorised version — clear Ts=30; % ms Td=60; % ms Chs=.001; % L/mmhg Chd=.015; % L/mmhg N=800; % number of elements t=0...

2 dagar ago | 1

How to plot circular phase in planar axis without lines going from ymin to ymax when data goes from -pi to pi?

I am not certain what result you want. The phase plots appear to be radian measure and otherwise relatively continuous, so see ...

2 dagar ago | 0

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I'm trying to make a for loop that has if statments that use the increments from my i to run them. How can I make this work, it won't run.

It runs. For equalities such as you are using, use the any function. Try this — Ts=30; % ms Td=60; % ms sc=10^-3; % con...

3 dagar ago | 1

| accepted

Cannot create .txt file in Matlab online

I am not certain what the problem is. Using fopen only creates the file ID, as you discovewred. To write the file, you need ...

3 dagar ago | 0

extract audio features from music

The spectralCentroid function was introduced in R2019a. You need to have that or a later release to be able to use it.

3 dagar ago | 0

MATLAB R2023a unusable on brand new desktop computer

Use Windows Task Manager and Resource Monitor to see what else is running and what resources are being used. Also R2023b is c...

4 dagar ago | 0

How can I replace random elements of a matrix with some definite respective values in a single line command?

You are using ‘’inear indexing, and that will definitely work, although I am not certain what you want to do. For a full expl...

4 dagar ago | 0

Getting Matrix Dimensions Error from Using "/", help with understanding problem?

Without knowing the sizes of the two arrays, one problem could be due to: totalbyhour = sum(count, 1); totalbyintersection = ...

4 dagar ago | 0

Combine a signal with AM noise

The array sizes are not compatible, and the signals must be sampled at the same rate. That is the problem, because that would r...

4 dagar ago | 0

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Problems in using map

You are seeing floating-point approximation error. Changing the first loop slightly to check that: kount = 0; format long ...

5 dagar ago | 0

| accepted

Plotting 'HH:MM' format times against the X axis

I am not certain what ‘decimal times’ are, however it appears that they might be something like ‘HHMM’ where all are four-digit ...

5 dagar ago | 0

I want my line graph to Overlap

I believe what you want is to put the variable name at the end of each plotted line. If so, try this — x = linspace(0, 2*pi...

5 dagar ago | 0

I have a problem in performing a loop calculation

I cannot understand exactly what you want to do or what the logic vector ‘d’ does. If you simply want to get the RMS value of...

5 dagar ago | 0

| accepted

Find Average Peaks Function

The mean value of the function between any two peaks would be — x = linspace(0, 10, 250).'; filt_RLE = 50 * sin(2*pi*x*1.5) ....

5 dagar ago | 1

If statement for 2 different variables.

Try this — x = @(i,j) (10 / pi + j ./ sin(i-1)) .* cos(j .* (i-1) * pi); i = 2:6; j = 1:7; [I,J] = ndgrid(i,j); Iv = I(:...

5 dagar ago | 0

Plotting HSP in Matlab

Use the hold function — [x,y,z] = sphere; radius = 7.1; x = x * radius; y = y * radius; z = z * radius...

6 dagar ago | 0

Efficient way to run code multiple times

I would use the ndgrid function to create matrices from the parameters that you want to vary, convert the output matrices to ve...

6 dagar ago | 0

How can I do a 3D plot after simulation.

Try this — LD = load('output_a_f_LL_bus5.mat'); Data = LD.Id_6.Data; t = LD.t.Time; figure plot3(Data(:,1), Data(:,2), t...

6 dagar ago | 0

| accepted

Anonymous function of a series of nonlinear equations to accept vector input

Either: f= @(x1,x2,x3) [x1.^3;x2.^2;x3.^2]; x=[1;1.2;1.3]; f(x(1),x(2),x(3)) or: f= @(x) [x(1).^3;x(2).^2;x(3).^2]; x=[1...

6 dagar ago | 1