# 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)

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**Feeds**

Curve fitting with multiple variables?

I recognise my code, so I’ll do my best to help. What do you want to do with these data? Are the ‘Vivm’ matrix supposed to...

4 hours ago | 0

I am recieving an error in creating the solution however it still prints a result.

In the last iteration of the loop, the results are all empty. One way to avoid the error is to test for at least one field to ...

20 hours ago | 0

| accepted

Solving ODE using laplace

Your code looks correct to me, and when I checked the result with dsolve, its solution agreees with yours — syms t s y(t) Y X ...

23 hours ago | 0

Old Matlab example of 1D FFT filter

The only function that I am aware of that might do what you want is the fftfilt function (introduced before R2006a). It require...

2 days ago | 0

| accepted

Plot a vector with a given angle against the y-axis

Another approach — thetad = 280; % Desired Angle (Guessing Value) x...

2 days ago | 0

Decreasing bin size FFT options for increased resolution

You can minimise the spectral leakage by windowing the fft (except for a rectangular window, which is the default if no others a...

3 days ago | 0

| accepted

Could anyone explain the example provided in thr help for understanding the use of fft?

This calculation of the frequency vector for the displayed Fourier transform is not the easiest to understand: f = Fs*(0:(L/2)...

4 days ago | 0

| accepted

Need help in assigning frequency and normalising amplitude to the fft plot

There may be several approaches to your problem. One of them is this — clear all close all clc L=10; n=1.45; c=2.9979e...

4 days ago | 0

| accepted

Left and Right side have different elements

You need to subscript ‘t’. Then, it works — t = 0:0.01:4; % Timesteps for robotic arm motion for i = 1:length(t...

5 days ago | 0

Error using Odearguments - vector must return a column

You only have one differential equation, so only one initial condition is necessary. %r_H2= -(-Rds - Rwf - Rh); %Rd = kds*(C...

5 days ago | 0

| accepted

I want to change the symbolic variables in my matrix to numbers

Use the fplot function — clear all ; close all; close ; clear syms s Expr = (sin(s)); F1 = int(Expr) syms n expr2 = 1/n ...

5 days ago | 0

| accepted

How to remove (or isolate) side peaks except main peak after FFT

Using: NFFT = 2^nextpow2(numel(signal)) and a window function (for example hann) in the fft call could improve the fft result...

5 days ago | 0

Trying to combine two IR spectra where x is wavenumber (cm-1) and y is transmittance (0 to 1), having trouble.

It would help to have the data. The best way is probably to interpolate the longer series to the length of the shorter series...

6 days ago | 0

Tornado chart with colormap gradient

Perhaps something like this — % Data data = [0.496; % Electrical conversion efficiency 0.426; % Biogas efficiency val...

6 days ago | 0

I'm trying to find displacement from acceleration datas

Your original ac celeration data have a trend, and you are integrating the trend. Use the detrend function tto remove it (alter...

6 days ago | 0

Fitting an anonymous function: Debye Callaway Model

I do not have your data so I cannot run your code. However it is always appropriate to compltely vectorise objective function...

7 days ago | 0

How to Reshape a Matrix into a Cell

Transpose the row vector, call reshape, then transpose that result — syms R11 R12 R13 R21 R22 R23 R31 R32 R33 k = 1; timest...

7 days ago | 0

Curve fit autocatalytic model

if ‘x’ is greater than 1 and ‘n’ is not an integer, the result will be complex. Example — k = rand m = rand n = rand x ...

7 days ago | 0

fsolve function not solving nonlinear equations, I had observed "Invalid datatype. Options argument must be created with OPTIMOPTIONS"; could you assist me, pse

One problem is that fsolve wants the initial parameter estimates as a single vector, and the third argument is the ‘options’ str...

7 days ago | 0

| accepted

apply hanning window for signal processing

I do not understand your code, so I am not certain where to suggest adding the hann call in that context. (I specifically do no...

7 days ago | 0

How to assign new variables?

Use the strrep function instead of the if block — jj = 1; dependent_vars{jj} = 'act_per_ha'; jj = 2; dependent_vars{jj} = ...

9 days ago | 0

Latex, sprintf and variable that changes

Your sprintf statement has fields for 3 variables, however you only provide 2. Provide all 3 and it works — i = 1; j = 1; ...

9 days ago | 0

| accepted

Why I have the error Genetic algorithm script error no Global Optimization Toolbox ?

You have to license, download and install the Global Optimization Toolbox. There is no separate license for gamultobj. You m...

9 days ago | 0

I need to plot precipitation data. First, adjust y limits of a stacked plot to accommodate totals for the month. Second, have dates on the x axis.

Convert the table to a timetablee and ‘Column2’ will automatically be plotted as a funciton of the time variable. However I d...

10 days ago | 1

How to get the Z-transform and tf of this function y[n] = 0,5y[n − 1] + x[n] ?

Perhaps something like this — syms n x(n) y(n) z t X(z) Y(z) assume(n>=0 & in(n,"integer")) Eqn = y(n) == 0.5*y(n - 1) + x(...

10 days ago | 0

Finding and integrating peaks in a data array

The findpeaks function will accurately locate the peaks. Integrating them depends on what you want to do. In the past, I have ...

10 days ago | 0

Finding length of time in between peaks.

I already addressed this in my Answer to your previous question on exactly the same topic. If you are having problems with it...

10 days ago | 0

| accepted

whats wrong with this code?

It works here. How are you calling your ‘aero_drag’ function? dens = rand v = rand A = randn(1,5) drag = aero_drag(de...

11 days ago | 1

usage of ode45

imshow(imread('WhatsApp Image...16.45 PM.jpeg')) syms M(t) I_1(t) I_2 V(t) t g mu A Y T Eq1 = diff(M) == -g*V*A Eq2 = diff(...

11 days ago | 0

Identifying PTT of ECG and PPG signals

Without your data, it is going to be nearly impossible to suggest an approach to this. Also, without your data, it is impossibl...

11 days ago | 0

| accepted