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Matlab - inputs must be scalar when using linspace
The problem is that the original ‘i’ value in each loop returned a vector, and that vector became the subscript for the ‘velocit...

2 years ago | 0

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solve not working for symbolic equation
When in doubt, plot the function. The ‘ib’ function has a minimum value of -146.3 and a maximum of -28.2. It never crosses...

2 years ago | 0

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How to know exactly what row (or index number?) in a table based on user input?
The file posted in your previous Question had only time values. Assuming the data you refer to here is different, the matchin...

2 years ago | 0

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Voltage find equation diagramm
Perhaps this — imshow(imread('LI.jpg')) T1 = readtable('Versuch.txt'); T1.Properties.VariableNames = {'Time','Voltage'} ...

2 years ago | 0

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Answered
My calculation for respiratory rate shows the same bpm for my 3 waveforms.
Perhap;s this — LD1 = load('USaverageImageIntensity_R1.mat'); Corr(:,1) = LD1.Corr; LD2 = load('USaverageImageIntensity_R2.m...

2 years ago | 0

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Add initial conditions when using laplace function
That requires a subs call for each equation. (The sympref call here makes this easier. You can remove it later if desired.) ...

2 years ago | 1

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Answered
3D plot two curves
Perhaps something like this — p = linspace(-pi/2, pi/2, 50)+pi/2; x1 = cos(p); y1 = 1.01*sin(p); x2 = cos(p); y2 = 0.99*...

2 years ago | 0

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Answered
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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Answered
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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Answered
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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Answered
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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