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How to find the coordinates of contours when they go out of bounds and form multiple contours?
Here is my approach to this — load('contours.mat') pk = -32; [c2] = contourf(x2,y2,z35b, [pk pk] ,'ShowText','on',FaceAlpha...

quasi 3 anni fa | 0

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How to combine columns from large dataset to datetime with correct vector or doublestring?
Use curly brackets {} instead of parentheses when referring to numbered table variables — Date=datetime(dataTable{:,3:5})+hour...

quasi 3 anni fa | 0

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How can I selectively multiplying the negative values with (-1) in an excel file?
Multiplying the negative values of column 2 by -1 will of course create them as positive values for all the entries. Use the ...

quasi 3 anni fa | 1

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How to estimate Y using a linear regression and an uncertain X value.
If I understand corectly what yoiu want to do, the best approach might be to use fitlm and then use the appropriate predict func...

quasi 3 anni fa | 0

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Why does expm command work too slow?
If you want to multiply it by scalar or vector ‘t’, create an anonymous function rather than doing it symbolically — A_aug = r...

quasi 3 anni fa | 1

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How to draw a semi circle filled with jet color (like in the image) ?
Try this — N = 250; th1 = linspace(pi, 3*pi/2, N); r = linspace(0, 1, N); z = r; x1 = r(:)*cos(th1); y1 = r(:)*sin(th1)...

quasi 3 anni fa | 0

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Time-dependent parameter in ODE solver
The interp1 use in the documentation section for time-dependent parameters refers to vector arguments with a dependent variable ...

quasi 3 anni fa | 0

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Connecting different sets of 3D points
I assume the rows are the (x,y,z) coordinates, If so, try this — A_3Dpts= [-0.91, 0.53, 0.32; -.88, .51, .3; -.84, .43, .16...

quasi 3 anni fa | 1

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How do I perform several iterations in MATLAB?
Since ‘y’ appears to be a column vector, the loop is not necessary. Just use: L = 1.56*(y.^2)*tanh(61.58/L); If you are loo...

quasi 3 anni fa | 0

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How do i find x from given y that is closest to my peak or at x=0?
One approach — x = linspace(-10,10,500); y = 1 - x.^2; L = numel(x); yval = -6; zxi = find(diff(sign(y -yval))); for ...

quasi 3 anni fa | 0

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Symbolic function Gaussian Beam
You need to use element-wise operations. See the documentation on Array vs. Matrix Operations for details. Also, you can use...

quasi 3 anni fa | 0

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Using repelem to vertially concatonate non-numeric variable
I am not certain what you want to do, however the repmat function might be a better choice, since it allows the dimensions to be...

quasi 3 anni fa | 1

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Is using alphabetical characters in the area (x,y) syntax possible?
‘Is using alphabetical characters instead of numeric arguments as x-variables in the area (x,y) syntax possible?’ Yes, in the...

quasi 3 anni fa | 0

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How to plot Rankine Half Body Streamlines
I can’t run that because the relevant data aren’t provided. Tha atan calls could be the problem. Substituting‘atan(y/x)’ with ...

quasi 3 anni fa | 1

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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...

quasi 3 anni fa | 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...

quasi 3 anni fa | 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...

quasi 3 anni fa | 0

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

quasi 3 anni fa | 0

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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...

quasi 3 anni fa | 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.) ...

quasi 3 anni fa | 1

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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*...

quasi 3 anni fa | 0

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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...

quasi 3 anni fa | 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...

quasi 3 anni fa | 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....

quasi 3 anni fa | 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])...

quasi 3 anni fa | 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...

quasi 3 anni fa | 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 ...

quasi 3 anni fa | 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...

quasi 3 anni fa | 0

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

quasi 3 anni fa | 3

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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...

quasi 3 anni fa | 0

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