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.
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Content Feed
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]);...
12 hours ago | 0
| accepted
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]...
14 hours ago | 1
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...
19 hours ago | 0
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...
23 hours ago | 0
| accepted
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...
23 hours ago | 1
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...
24 hours ago | 0
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...
1 day ago | 0
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 .
1 day ago | 1
| accepted
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 ...
1 day ago | 0
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...
1 day ago | 0
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...
1 day ago | 0
How can I estimate the parameter of reaction kinetics using ODE solver?
I am not absolutely certain how to approach this because chemical engineering is not an area of my expertise. First, I would ...
2 days ago | 0
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...
2 days ago | 0
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))*(...
2 days ago | 0
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...
2 days ago | 0
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 ...
2 days ago | 0
ODE45/ODE15 inquiry about nonlinear spring
Since the system appears to describe a differential-algebraic equation, see the documentation section on Solve Differential Alge...
2 days ago | 0
Symbiological output using 'syms' and 'pretty' commands
Experiment with the indexing into the expressions (since this is a straightforward solution to a number of otherwise difficult p...
2 days ago | 0
How do I reflex a plot?
Try this — u = -8:1:1.3; v = -pi:pi/10:pi; for k = 1:numel(v) x{k,1} = 1 + u + exp(u)*cos(v(k)); y{k,1} = v(k) +...
3 days ago | 0
how to increase function values through its derivetive
Do some simple experiments to see what produces the desired result — syms k x dx1 = 2*x; ...
3 days ago | 0
Problem to solve integration
Change this — f = @x sin(x); to this — f = @(x) sin(x); That should work. .
3 days ago | 0
Removing a particular legend from plot
The first two lines have the same line style. To see them individually, choose a different line style for each. To label t...
3 days ago | 0
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how to solve the following equation?
Try this — a=[1,2,3]; afcn = @(b) ((b-2).*(b+1))./((b+3).*(b-1)); [estb,fval] = fminsearch(@(b) norm(afcn(b) - a), rand) ...
3 days ago | 0
| accepted
How to plot 3D filled contour ?
It would help to know the data and the desired result. One option is to use the surf function and contour3 — [X,Y,Z] = peak...
3 days ago | 0
Using ode45 for a non linear differential equation with a term in a vector form
I do not understand the problem. Is the objective to estimate a parameters of the differential equation from data? The tim...
3 days ago | 0
| accepted
why do I get an error "First input argument must be a function handle"
I have no idea what the code does. See if this paproximates the desired result — nUn = 2000; nU2n = 1500; nU3n = 200;...
4 days ago | 1
I need help solving RC circuit using Leplace inverse, then graph the output which is in the symsum form
Sometimes a bit fo force (such as using vpa) is necessary — syms s t Ys2(s)=((2*s^2+7*s+3)/(2*s^3+11*s^2+15*s+4)*(2*s+2)/(...
4 days ago | 1
| accepted
2D contour plot with given matrix
Two possibilities — M = [25, 25, 25 111.5, 137.8, 245.1 146.3, 178.3, 296.4 111.5, 137.8, 245.1 25, 25, 25]; figure ...
4 days ago | 0
| accepted
from curve fit to look up table
The question is a bit ambiguous. Interpolation of some sort would appear to be the best option, and of course the approach de...
4 days ago | 0
Curve fitting for multivariable
There are several options. I’m using fminsearch here. xdata = ... [0.882263937 0.882263937 0.882263937 0.882263937 0...
4 days ago | 0
| accepted
