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Star Strider


Last seen: Today Active 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
fzero returns "Too many input arguments"
Perhaps the order in the code is wrong. The functions must all be at the end of the script for included functions to work. T...

2 hours ago | 0

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Answered
histogram of x and y data from a txt file
It seems to produce the correct result on its own! T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_f...

6 hours ago | 0

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Answered
How can I assign a single column of a 0x10 empty table
Preallocation for table arrays is possible. myTable = table('Size',[10 1], 'VariableNames',{'firstVariable'}, 'VariableTypes'...

7 hours ago | 0

Answered
Fitting and parameter estimation of kinetic model ODE system
Optimising 14 parameters is asking a lot of fminsearch! I switched to lsqcurvefit here because fminsearch is not likely to be u...

8 hours ago | 0

Answered
How can I plot laplace transformed functions?
It might be easier to do this outside the Symbolic Math Toolbox. That aside, try this — syms x s js rs sigma omega f = sin...

12 hours ago | 0

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Answered
Feedback Function Not enough input arguments error
Please do not mix Symbolic Math Toolbox and Control System Toolbox commands. It only confuses both of them! k=0.0223; thet...

1 day ago | 0

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Answered
Unable to install Signal Processing Toolbox on Linux
Contact Support Include the URL of this thread in the note to Technical Support so that it is not necessary to repeat everyth...

1 day ago | 0

Answered
Find gradient ascent for 3D surface
This code finds the maximum of the surface and then uses griddedInterpolant with the calculated ‘xv’ and ‘yv’ vectors to draw th...

1 day ago | 1

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Answered
I want to colour the area between red line and black line below the intersection point. how am i going to do it?
Use ‘logical indexing’ to identify & fill the appropriate area — c=[3,5]; A=[1,2;1,1;0,1]; b=[2000;1500;600]; y1=0:1:ma...

1 day ago | 0

Answered
Simple way to create a block-diagonal matrix from a single vector.
I don’t understand exactly what ‘z’ is or what the desired result is. One possibility is to replicate the original matrix usi...

1 day ago | 0

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Answered
Output additional vectors from ode45
Adding additional outputs is permitted, providing that they are not used in the ode45 call. Normally, this is not a problem, be...

2 days ago | 1

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Answered
Why getting NaN's and other garbage from interp1?
I am not certain what the problem is (providing the data without the code and interp1 calls is not informative), however unless ...

2 days ago | 0

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Answered
Vectors must be the same length
The number of elements in ‘Y1’ in the plot need to be the same as the number in ‘x’ so one way would be to re-define ‘x’ to be t...

2 days ago | 0

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Answered
Problem with AlphaData property
The FaceAlpha (transparency) value is set to 'interp' and it is doing exactly what it is told to do! It will likely be necess...

2 days ago | 0

Answered
system of differential equations
Use the Symbolic Math Toolbox if available. Those all appear to have analytic solutions, since they all appear to be linear. S...

2 days ago | 0

Answered
Number of line for fcontour
A somewhat different approach — syms x y z(x,y) = exp(-(x-5)^2) + cos(y) figure hfc = fcontour(z, [0 10 -2*pi 2*pi]);...

3 days ago | 0

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Answered
ho to find index at which the 50% of the sum vector is included?
A least-squared-difference approach works — a=[3 5 7 3 5 8 9 3 1 41 6]; suma = cumsum(a); suma50 = suma(end)/2; [minv,idxv]...

3 days ago | 1

Answered
How can I skip the first to lines from a text file and proceed to read the file with header lines in between the values?
Try this — C1 = readcell('https://www.mathworks.com/matlabcentral/answers/uploaded_files/814274/BSH_HBM_tracer_productgrid_f...

3 days ago | 0

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Answered
How to activate the low-pass filter on NI-6115?
It will likely be best to Contact Support for this. I did an online search and could find no previous posts regarding the NI-61...

4 days ago | 0

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Answered
Function value and YDATA sizes are not equal. Can anyone help?
The problem is the randn call. With one argument, it creates an (nxn) matrix, not a vector, so of course the sizes will not mat...

4 days ago | 1

Answered
Error with the division
Use the table2array function to convert the contents of the table to an array. Assign the arrays to new variables rather than o...

4 days ago | 0

Answered
error [empty sym] using dsolve "Warning: unable to find symbolic solution"
It is likely not possible to derive a closed-form (analytic or symbolic) solution for those. Create an anonymous function to us...

4 days ago | 0

Answered
How to define values in a vector as NaN ?
Try this (using ismember) — A = [1 2 3; 4 5 6]; B = [2 3; 5 6]; C = ismember(A,B) A(C) = NaN .

4 days ago | 1

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Answered
Define an additional variable in ODE solver
This is all a bit confusing, since the differential equations are not them selves functions of ‘C1’ and ‘C2’, so a differential ...

4 days ago | 0

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Answered
Can't Uninstall, What Should I Do?
Option #1: Contact Support The uninstall function deletes registry entries as well, however a fresh install should over-write...

4 days ago | 0

Answered
symbolic variables into double array, observability matrix
The variable values need to be provided in order to use the Control System Toolbox funcitons. To do this symbolically, create...

4 days ago | 0

Answered
Question in continuous time signals
Everything in a computer are discrete, not continuous (except the voltages on the chips themselves and the outputs of a soundcar...

4 days ago | 0

Answered
How to solve the implicit equation
First, a multiplication operator (my best guess, anyway) is missing: ((alfa*Vt*Vmpp*(2*Impp-Isc))/((Vmpp*Isc+Voc*(Impp-Isc))*(...

4 days ago | 0

Answered
How can we combine the two figures?
‘When you execute the code below, two plots are drawn.’ No, not without knowing what the variables are. However the prob...

4 days ago | 0

Answered
Calculate this matrix in a more general and shorter way
Yes, actually. However since it appears that the objective is to do a Fourier transform, I would set it up a bit differently ...

5 days ago | 0

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