# 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. Time Zone: UTC-7 (Standard); UTC-6 (Daylight Savings/Summer)

**Statistics**

RANK**3**

of 265,487

REPUTATION**58,926**

CONTRIBUTIONS

**0** Questions

**18,292** Answers

ANSWER ACCEPTANCE **
0.00%
**

VOTES RECEIVED**8,141**

RANK**2,629** of 18,136

REPUTATION**593**

AVERAGE RATING**4.70**

CONTRIBUTIONS**5** Files

DOWNLOADS **29**

ALL TIME DOWNLOADS**5553**

CONTRIBUTIONS**0 Posts**

CONTRIBUTIONS**0** Public Channels

AVERAGE RATING

CONTRIBUTIONS**0** Highlights

AVERAGE NO. OF LIKES

**Content Feed**

How to use num2str inside text with latex interpreter?

I prefer to use sprintf for this. (If you use any escape characters, you need to use double backslants. See the documentation ...

2 hours ago | 0

Error when trying to plot a polynomial with data.

Use the polyval function.

5 hours ago | 0

| accepted

How to fit my data with a custom equation meant to come out as a parabola?

The ‘constant’ (parameter vector) is giving back three values because you are giving it three values to begin with: [min(avera...

8 hours ago | 0

Get Lapalce transform from filter specifications

Not that I am aware of, however it would be relatively straightforward to create it — Rp = 1; Rs = 50; [b,a] = ellip(5, Rp,...

11 hours ago | 0

How to properly set ticks, numbers and the their decimal places on colorbar?

Try something like this — [X,Y,Z] = peaks(50); figure surf(X, Y, Z) grid on colormap(turbo) hcb = colorbar; % get(hcb)...

12 hours ago | 0

| accepted

How to evaluate numeric expression in a string, which contains "12u" (for 12e-6) and "0.1m" (for 0.1e-3) formated numbers (standing for micro and milli)?

Here is my regexprep attempt at ‘seval’ — str = 'max(1u,2m)'; out = seval(str) str = 'max(1.5u,2.01m)'; out = seval(str) ...

14 hours ago | 0

| accepted

System Identification Toolbox with Multiple Input Variables and one Output Variable

If by ‘parameter’ you mean inputs and outputs respectively, yes. See the iddata section on Input Arguments, then define the s...

15 hours ago | 0

| accepted

Error tolerance in matlab

Singularities occur when the denominator of a fraction approaches zero, or for certrain transcendental functions (e.g. exp, tan)...

15 hours ago | 0

Time Domain Data or Correct Data Structure for System Identification Toolbox

The signals appear to be regularly sampled, so that should work. The iddata function is an appropriate starting point for time ...

1 day ago | 0

| accepted

help create a positive sin wave

Perhaps — syms t positive_sine = sin(2*pi*t) + 1 figure fplot(positive_sine, [0 5]) grid ylim([-1 3]) hold on yline(0,...

1 day ago | 1

System of Nonlinear Equations exceeds function evaluation limit

You need to tell fsolve that the options sturcture exists — g = 9.81; Az_mech = 0.028*g; Az_dyn = 0.5*g; Ax_mech = 0.092*g;...

1 day ago | 1

| accepted

Plot will not graph lines

The ‘d’ values are all scalars. Perhaps plooting the ‘y’ values as a function of their associated ‘x’ values — g = 9.81; v...

1 day ago | 0

fitlm and exponential model help

The "exponential" option for modelspec does not appear to exist. The fitnlm function is likely more appropriate. That is mor...

1 day ago | 0

Graph not showing plots

The loop is not necessary. However if you choose to use it, the variables must be subscripted in order to save them to vectors ...

1 day ago | 0

vector partial derivative of a two variable function

Use the gradient function — x=[0:0.1:1]; y=[0:0.1:1].'; z=x.^2+y.^2; [Dx,Dy] = gradient(z) figure surf(x,y,z) hold o...

2 days ago | 0

Date/Time Processing and Formatting Issues

The 'yyyy' needs to be 'uuuu' (ISO year) to avoid problems with the conversion — C = {'2022:246:10:00:02.593994140',4.44E+01 ...

2 days ago | 0

| accepted

MATLAB is not displaying my numbers as what they should be.

Use the format function to display the data as you want them.

2 days ago | 0

| accepted

How to find inflection point of a curve

First, use the sgolayfilt function to eliminiate as much of the noise as possible, since taking the derivative will amplify it. ...

3 days ago | 2

| accepted

Creating a log probability plot for particle size distribution

See the Statistics and Machine Learning Toolbox probplot function.

3 days ago | 1

| accepted

Print different name than that of the index in figure inside for loop

Probably the easiest way would be to specify a vector for the names and index into it — v = [10 100:100:900]; for i = 1 : 10 ...

3 days ago | 0

| accepted

Formatting exel import in readtable()

It would help to have the Excel file to experiment with. In its absence see the documentation on detectImportOptions and expe...

3 days ago | 1

| accepted

problem using the solve method

‘but matlab wont give me an exact solution’ Yes, it will — syms t eqn = 1000/(exp(log(4) - t/40) + 1) == 800; ts = solve(...

3 days ago | 1

Application of Logical operators

Perhaps something like this — figure hold on for k = 1:4 patch([1 2 2 1]+2*(k-1), [1 1 4 4], 'b', 'FaceAlpha',0.5) ...

3 days ago | 0

Does MATLAB have inverse tangent integral TI2(z)?

The polylog function exists in the Symbolic Math Toolbox. It supports symbolic and numeric (double) arguments.

4 days ago | 0

How do I apply a function to every resulting element of a buffer function?

‘How do I apply a function, e.g. hamming(256), to each column?’ Do an element-wise multiplication — v = randn(256,2) vh ...

4 days ago | 0

| accepted

How can I fix "Error in sym/subsref (line 898) R_tilde = builtin('subsref',L_tilde,Idx); ?

Perhaps — syms xQ xQ = sym('xQ',[1 3]) xQ2 = xQ(2) See the documentation on sym for details.

4 days ago | 0

Second order to first order system

One approach (that involves doing an interim Laplace transform on the differential equation) — omega = 2; zeta = sqrt(3)/4...

4 days ago | 0

Saving population individauls for each generation of GA Multiobjective optimisation.

I created a function for ga (not the multiobjective version) that will do that. See if the approach in How to save data from Ge...

5 days ago | 0

Sometimes my 2-D plots won't show up.

Normally, that sort of problem is caused by using matrix division (/) instead of element-wise array division (./) however the ‘x...

5 days ago | 0

| accepted

lsqcurvefit - initial condition

The problem with nonlinear parameter estimation is that the results can be highly dependent on the initial parameter estimates. ...

5 days ago | 0

| accepted