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Create a fit for data with a polynom first degree
I would expect R² to be 1 (or close to it) if a lilnear model is a perfect firt to the data. Using fitlm — x = [0.1201 0.13...

2 years ago | 0

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unable to plot columns of multiple cells
Logarithms of time variables do not actually exist (probably anywhere), however there are ways to get round that problem. Thi...

2 years ago | 1

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how to fit the coupled differential equations and get the coefficients?
See: Parameter Estimation for a System of Differential Equations (and similar posts) for an easy way to estimate the parameters....

2 years ago | 0

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Trouble using the ode45 input
The call to ‘f’ in the ode45 call (and the correct ode45 call) should be: [t,Y] = ode45(@(t,y)f(t,y,omega0), [0, 15], [y0,v0])...

2 years ago | 0

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Entry and exit points / trajectories through a rectangle (orbits)
This should be a relatively straightforward interpolation problem in that the only calculations necessary should be to first fin...

2 years ago | 0

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calculate boolinger bandwidth using matlab function
The std2 function takes the standard deviation of all the elements in an array (it only has one argument, that being the entire ...

2 years ago | 0

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strange behavior of plot and freqz
Thje angle functon returns angles in radians. If you add a call to the rad2deg function, the results will be in degrees, and t...

2 years ago | 0

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Answered
System Identification - Matlab 2023a not launching
Try running these from a script or your command window — restoredefaultpath rehash toolboxcache It might also be necessary...

2 years ago | 3

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Answered
Root Locus from equation?
It might if you aske it to and give it a causal system it can work with — s = tf('s'); eqn = @(u) 1 / (1472*s^4 - 99.2*s^3 -2...

2 years ago | 0

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Answered
How to implement Complex Exponential Function Using Matlab ?
I am not certain what you are doing or what ‘w1’ and ‘w2’ are, so using my best guess — format longE F = 40E+3; N = (0:20).'...

2 years ago | 1

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Parse through .txt file to create vector
Use the fixedWidthImportOptions function and readmatrix (since there are apparently no header lines or variable names) — opts...

2 years ago | 0

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Change intensity of zplane figure
Changing the properties requirees a bit of handle-spelunking, however it is possible. Try this — [z,p,k] = ellip(4,3,30,20...

2 years ago | 1

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Answered
color region in the plot based on the values
Try this — LD = load('matlab.mat'); A = LD.A thrshld = 5; Lv = A(:,2) > thrshld; idx1 = find(Lv); idx2 = idx1(diff([0; ...

2 years ago | 0

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Problem with fill()/patch() between two lines in R2023a
I am not certain what result you want. For column vectors, use flip (or flipud) and concatenate the vector arguments vertica...

2 years ago | 1

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xlim in boxchart not working
It would help to have the data and code to test, since I cannot find any examples in the boxchart documentation that could prov...

2 years ago | 0

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Is it possible to implement an array as a variable inside a state space matrix?
You would have to integrate your model using one of the numerical integrators such as ode45. It is definitely possible to use ...

2 years ago | 0

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Fitting an exponential equation to this data with CFtool
I get this result with fitnlm — y=[10 80 120 180 280 415 680 972 1178 1322 1445]; t=[50 300 410 600 900 1190 1797 2400 3000 3...

2 years ago | 0

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Get datetime from variable name
When I look at the .png files, all the values appear to be the same among all the other variables. I am not certain what you wa...

2 years ago | 0

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How to create a FRF graph of the real and imaginary parts of a signal
It appears that is its default behaviour if you request outputs — load modaldata figure subplot(2,1,1) plot(thammer,Xhamm...

2 years ago | 1

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Answered
How to label names in bar graph?
One approach (using xticklabels introduced in R2016b, as was string) — Data = rand(8,3); xlables = ["THD" 3 5 7 9 11 13 15]; ...

2 years ago | 0

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Answered
I loaded a data file, but why is matlab not able to name the different columns of data within the txt file?
It would be best not to convert the .csv file to a text file (or to anything else) initially. Instead, use readtable to read ...

2 years ago | 0

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Error "First input argument must be a function handle." function used fzero Please help to resolve the issue. Thanks
The assignment statements are out-of-order (so ‘n’ and ‘hf_0’ do not yet exist when they are assigned in ‘LHS’) and two functon...

2 years ago | 1

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Answered
how to code equation
Using the Symbolic MAth Toolbox — syms xi lambda psi Eqn = psi - log(psi) == -3 * -4 * log(lambda/2) + 4 * log(xi) + 2 * la...

2 years ago | 0

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Error when using interpolation method
The serial numbers change position because timetable arrays require that the time vector be the first column, regardless of how ...

2 years ago | 0

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want to calculate std_value and mean_value
There are 395449 ‘Inf’ values in ‘img’ (probably the result of the subtraction in the denominator of the transformation) so thos...

2 years ago | 0

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Finding y-intercept for loop
I made some minor changes to your code, and added a loop to return reasonably precise values of ‘y’ for each intersection. Your...

2 years ago | 0

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Removing the noise/filter
The signal has broadband noise, so ffrequency-selective filters will not work well to limit that noise. The best approach fro b...

2 years ago | 0

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i have to read an exel file which has iterations and cl/cd/cm and make a loop for plotting subplots for cl/cd/cm vs iteration which has different angle of attacks.
If you need to do those plots in a loop, and assuming that the table variable names are (in order): iteration1, cl, iteration2, ...

2 years ago | 0

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Help in integration in MATLAB?
If you want a numeric result, use the vpaintegral function — syms w L = (5.*(i.*w).^5 - 170.*(i.*w).^3 + 1125.*(i.*w))./(5.*(...

2 years ago | 1

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Answered
How can I find the peak location from the FFT output?
Missing data file. However this is straightforwazrd — Fs = 1000; L = 10; t = linspace(0, L*Fs, L*Fs+1)/Fs; % [1 2 3]'...

2 years ago | 0

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