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Star Strider


12 890 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

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Answered
Mldivide gives rank deficency when solving for large full system
See if the lsqr function will do what you want. Another option is to use pinv to do the matrix inversion (not normally an app...

environ 2 heures ago | 0

Answered
i am not able to import excel sheet
One approach would be to open Excel, then save your spreadsheet as a .txt file (likely a comma-delimited text file). Then impor...

environ 2 heures ago | 0

Answered
diff makes M less than what i want by 1 elment and i want to have second derivaitve numircal
Use the gradient function. Specifically: k = 0:0.1:5; figure(4) E=(k.^2)*(1.0540^2)/(2*1000*9.1); fx=gradient(E)./grad...

environ 3 heures ago | 0

Answered
Hello, how to solve this equation E*I*k^4-m*v^2*k^2+2*m*v*w*k+(m+M)w^2=0 numerically where w is variable,
Supply all the scalar parameters, then: Eqn = @(w) E*I*k^2-m*​v^2*k^2+2*​m*v*w*k+(m​+M)w^2; w0 = 42; [w,fval] = fsolve(Eqn, ...

environ 3 heures ago | 0

Answered
Plot ODE Bond Price Model
Not enough information, so I created the missing variables: tv = linspace(0, 100, 25); % Time...

environ 14 heures ago | 0

Answered
Simple system of ODES with starting condition
The only (relative) mistake I can see is that it is not good to use global variables. Pass the values as extra parameters inste...

environ 17 heures ago | 0

Answered
Struggling with iterative matrix multiplication
A loop is necessary. Assuming ‘lamda’, ‘omega’ and ‘phi’ are scalar constants already defined, I would do something like this...

environ 18 heures ago | 1

Answered
HOW TO FİND PEAKS OF FFT
I recognise my code! The second plot call is almost correct. Try this: [pks, locs]=findpeaks(x(Iv)); plot(Fv(locs), p...

environ 21 heures ago | 0

| accepted

Answered
Testing a created function
First, it is best not to use ‘ans’ as a variable, since it is the default variable and can be overwritten. Second, the the if...

1 jour ago | 0

| accepted

Answered
Solve a system of linear equations in matrix form
The problem is that the system is sparse, so you need to use sparse functions with it. Try this: Left = [1 -1 0 0 0; 1 0 0 ...

1 jour ago | 0

| accepted

Answered
Error plotting bode diagram of a transfer function inside a matrix
That is not the error. The error is that you are using the Symbolic Math Toolbox when you need to be using the Control System...

1 jour ago | 0

| accepted

Answered
how to plot 2D Vector field of a 3D ode
The easiest way is to just change the view direction: figure q=quiver3(x1,y1,z1,u,v,w ,2); figure(gcf); view(0, 90) Make ap...

2 jours ago | 0

Answered
Plot doesn't show anything
Try this slight edit of your code: orbit=zeros(1,300); j=0; % parameter range rv=2.8:0.001:4; for k = 1:numel(rv) r =...

2 jours ago | 0

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Answered
Scatter plot legend marker size is huge
The only possibility I can suggest is to use Yair Altman’s export_fig to export them to PDF.

2 jours ago | 0

Answered
3D plotting base surface
I am not certain what you are asking. The plot appears to be by the stem3 function. Try this: x = randn(1, 10); y = ran...

2 jours ago | 0

Answered
Solve Integral Equation with function handles
Every multiplication in ‘Fermi’ needs to be vectorised (with element-wise operations), the Symbolic Math Toolbox is not necessar...

2 jours ago | 1

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Answered
Graphs of mean and standard deviation
There are several ways, depending on what you want to do. See the errorbar function for one option.

2 jours ago | 0

Answered
scatter with custom color of point
I am not certain what you want. Try this: x = rand(1, 20); y = rand(1, 20); c = y >= 0.5; ...

2 jours ago | 0

Answered
Fitting Data to a Non-Linear Curve
One possibility: x=[0 1 2 3 4 5 6 7 8 9 10]; y=[.0242 0.1940 0.2792 0.2358 0.1386 0.0598 0.0238 0.0090 0.0034 0.0013 0.002]; ...

3 jours ago | 0

Answered
mono font not show up in matlab’s fonts
See: How can I add a new font to the list of available fonts in MATLAB?q - MATLAB Answers - MATLAB Central

3 jours ago | 0

Answered
How to use a timer most efficently for finding pings/second
One option for recording the times would be to use the clock function. Then use the etime function to recover the elapsed times...

3 jours ago | 0

| accepted

Answered
Subplots squished to top of page, manually setting position not working
The code tells subplot to plot 12 rows and 3 columns. Try this instead: ax(ii) = subplot(nplts/3, 3, ii); The result is mu...

3 jours ago | 0

| accepted

Answered
Filing/interpolation of irregular sample time series multivariate data
Try this: T1 = readtable('Edward Bam Eddata.txt'); T2 = table2timetable(T1, 'RowTimes','TimeStamp'); T3 = retime(T2, 'daily'...

3 jours ago | 0

| accepted

Answered
Need to plot the determinant of the matrix for t 0 to 1?
Try this: PHI = @(t) [ 1, t, t/3-(2*exp(-3*t))/9+2/9, (2*t)/3+(2*exp(-3*t))/9-2/9; 0, 1, (5*exp(-3*t))/12-(3*exp(t))/4+1/...

3 jours ago | 0

| accepted

Answered
MatLab Confidence interval range
Use the tinv function to calculate the critical values for normally-distributed data with varying sample sizes. (This is in the...

3 jours ago | 0

Answered
How can I insert the value of a symbol in symbolic matrix and convert it into a numerical matrix?
Please see Plotting error: Need to plot the evolution of symbolic matrix? to convert it to a numerical matrix (as an anonymous ...

3 jours ago | 0

Answered
for loop not working
We o not have your entire code. Note that the transpose call is not necessary, since the mean funciton also accepts a dimension...

3 jours ago | 0

| accepted

Answered
Plotting error: Need to plot the evolution of symbolic matrix?
Try this: PHI = @(t) [ 1, t, t/3-(2*exp(-3*t))/9+2/9, (2*t)/3+(2*exp(-3*t))/9-2/9; 0, 1, (5*exp(-3*t))/12-(3*exp(t))/4+1/...

3 jours ago | 0

| accepted

Answered
surface fixed point value Z
I do not have the function you used to create the surface in your Question. Try this with it: [X,Y] = ndgrid(-2.5:0.1:2.5);...

4 jours ago | 0

| accepted

Answered
X Y grids on 2D surface plot
If you want to see the grid lines, do not use shading interp Just do: [X,Y,Z] = peaks(25); figure surf(X, Y, Z) grid on ...

4 jours ago | 0

| accepted

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