Star Strider

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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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How do use the annotation function to annotate specific x-values on my graph?
I wrote a couple anonymous functions recently to transform (x,y) coordinates to normalised coordinates for just this purpose. ...

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Can't get symbolic numbers.
The sympref function should work, specifically: sympref('FloatingPointOutput',false); or: sympref('FloatingPointOutput','de...

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Combining multiple matrices into a single vector
A single vector is not possible, however a 3D array is with the cat function — T1 = [2 3; 4 2]; T2 = [1 7; 9 ...

대략 23시간 전 | 0

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Plotting a heat map using surf function
It would help to have the matrices. What does it look like with: view(3) Otherwise, add a colorbar for information, and ex...

대략 24시간 전 | 0

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How can I change an entire column of dates into datetime format?
It appears to be UCT (or GMT in 1940). Perhaps this (the 'InputFormat' descriptor must match the format of the string you wan...

1일 전 | 0

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How to stack-up multiple cases in z axis?
clc clear x(1) = 0 ; y(1) = 0 ; zm = NaN(2,200); multiplier = 50 ; figure(1) hold on for i1 = 1:2 multi...

1일 전 | 0

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How to fill color between two curves?
If you only want the region between the curves before or after they cross, use ‘logical indexing’. Try this — % clc % clea...

2일 전 | 0

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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...

3일 전 | 0

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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...

3일 전 | 0

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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 ‘...

3일 전 | 0

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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 ...

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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))...

3일 전 | 0

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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. .

3일 전 | 0

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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...

3일 전 | 0

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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....

3일 전 | 0

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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...

4일 전 | 0

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Bar plot with lower values not fixed
Use the patch function in a loop — x = (1 : 9).'; % Assume Column Vec...

4일 전 | 2

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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...

5일 전 | 0

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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...

5일 전 | 1

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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 ...

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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...

5일 전 | 1

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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 ...

6일 전 | 0

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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.

6일 전 | 0

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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...

7일 전 | 0

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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...

7일 전 | 0

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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 = ...

7일 전 | 0

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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...

7일 전 | 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 ...

7일 전 | 0

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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 ...

7일 전 | 0

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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...

8일 전 | 0

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