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Star Strider


11,228 total contributions since 2012

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.

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Answered
Labelling peaks on a graph
Use the findpeaks (link) or islocalmax (link) function, and the text (link) function.

3 hours ago | 0

Answered
Surface plot form 1d data
We have absolutely no idea what result you are expecting. Try this: %% 1D line plot x = linspace(0,1000,1000); C = @(...

18 hours ago | 0

Answered
Ignore text in a txt file
It depends on the function you are using to read them. In the textscan (link) and other functions that use textscan, they are ...

19 hours ago | 0

Answered
Having trouble solving system of equations
Use the correct syntax for solve, and use the vpa function to get numeric results: syms c1 c2 [C1,C2] = solve(c1==18*c1-1200+...

20 hours ago | 0

Answered
help with ode solvers non-linear ode 1st law of thermodynamics
I let the Symbolic Math Toolbox have its way with your equations: syms w Ao q Ap Pa k L g t y(t) P(t) m(t) V c Y Dy = diff(y...

20 hours ago | 0

Answered
How to peform multiple paired-t tests
You need to be very careful doing multiple comparisons. See the documentation for this multcompare (link) function (there are t...

22 hours ago | 1

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Answered
Displaying for loop iterations as a matrix
I am guessing here: Rv=0.6:0.05:0.95; for k1 = 1:numel(Rv) R = Rv(k1); A=[(1.5*R-1.59), 0.5*R, 0; 0.5, -21.75, 0; 0...

23 hours ago | 0

Answered
Can't run an equation in a function that works in a script
Try this: function [y] = test(x) c1 = 0.5176; c2 = 116; c3 = 0.4; c4 = 5; c5 = 21; c6 = 0.0068; % equation 1 lamdai1 z...

23 hours ago | 0

Answered
What is the solution for below code? It shows error
I suspect the error refers to this assignment: [,F,T,P]= spectrogram(y,NW,[],[],fs); (that also seems to be missing an output...

1 day ago | 0

Answered
3D plotting in Matlab
If you are plotting vectors, use the plot3 (link) function. Other possibilities are scatter3 (linked to in the plot3 page), and...

1 day ago | 0

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Answered
Update Matlab's font list
There are a few font utilities in MATLAB. See the documentation on the listfonts (link) function, and links to related function...

1 day ago | 0

Answered
Integration is not evaluated inside a function file
In the MATLAB Symbolic Math Toolbox, the correct syntax for your int call would be: q1 = int(FF,b,0,a1) However, I do not und...

1 day ago | 1

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Answered
Why am I not getting an array of answers from this operation?
Because you coded it with incorrect syntax. Try this: t=linspace(0,3.5,1000); u=4*exp(-0.45*t).*sin(4*t + 0.5); figure ...

2 days ago | 0

Answered
Plotting 1402 data points for a voltammogram
‘... when i try 'plot(x,y)' it says I have too many input arguments ..’ You probably have a variable (or your own function) t...

2 days ago | 0

Answered
How to add header to a table?
Use the 'VariableNames' (link) name-value pair with your ‘header’ cell array.

2 days ago | 0

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Answered
Assignment has more non-singleton rhs dimensions than non-singleton subscripts
Your ‘x(i,i)’ references a single scalar value. To assign the result to a column of ‘x’, do this: x(:,i) = xl+(xu - xl).*rand...

2 days ago | 1

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Answered
Outputting solutions to symbolic variables in a matrix.
Assuming the vector elements are not functions of symbolic variables (i.e. are purely numeric) see if using the double (link) fu...

2 days ago | 0

Answered
How can I stretch a line of best fit to the limits of my axes?
You simply need to concatenate a ‘0’ to ‘xrefract’ in the polyval and plot calls: lobf = polyval(poly,[0, xrefract]) and: p...

2 days ago | 0

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Answered
Find all points of intersection between two functions
There are only 2 real intersection points. To find them, you simply need to find out the x-values where the functions equal eac...

3 days ago | 0

Answered
Creating a linear plot over a plot of giving numbers
Try this: plot (x1,y1,'p') hold on plot([0 20], 3+0.5*[0 20]) hold off It’s a linear function, so you only need the limits...

3 days ago | 0

Answered
how to solve laplace transform problem in matlab
We do not know what you did to solve this. (Always post what you’ve already attempted.) However, if you got frustrated, that i...

3 days ago | 0

Answered
Writeing a stings using Matlab 2015
The standard output (The Command Window) has a file identification number = 1. So: fprintf(fid, 'Hello\nWorld\n') will pr...

3 days ago | 0

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Answered
Step Fucntion in Matlab
Since the unit step functrion is defined as being equal to 1 for , I would use: Ustp0 = @(t) (t >= 0); Ustp1 = @(t) 0.5*(t =...

3 days ago | 0

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Answered
How can I subs 2 symbolic vectors in 1 comand?
You defined ‘Z’ to require 4 different arguments, so the substitution has to match them, either using subs or using ‘Z’ as a fun...

3 days ago | 0

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Answered
Bathymetric data into a surface plot
Try this: [D,S] = xlsread('Bathymetric data (XYZ).xlsx'); Lon = D(:,1); Lat = D(:,2); Dep = D(:,3); figure plot3(Lon, L...

3 days ago | 0

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Answered
When I run the program inaccurate results appear What is the problem?
The best approach to this is likely not the vpasolve function, since it takes forever. I have no idea of these are the ‘accur...

3 days ago | 0

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Answered
About MATLAB R2018B update
I installed the R2018b Update3 yesterday and when I checked just now, it said that I was running the latest update. I suggest...

3 days ago | 0

Answered
How I can Plots this function
Another approach: x = @(t) 3*exp(-2*t) .* (t >= 0); t = linspace(-10,10); figure plot(t, x(t))

3 days ago | 0

Answered
How to keep a patch object and its rotation in the same plot
Try this: x = [1 2 2 1]; y = [1 1 2 2]; figure bot = patch(x,y,'blue'); rotate(bot, [0 0 1], 45) hold on patch(x,y,'bl...

4 days ago | 0

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