Answered
displaying 2 graphs in singe run
‘... but evry time it replace the first graph ...’ It does not replace them. It creates a second figure and that figure is o...

5 years ago | 0

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Answered
Find two x values for one y value
C=1*10^(-4); L=3*10^(-1); R=100 N2=100; frez=1/(2*pi*sqrt(L*C)) %f value for Imax(theory of RLC c...

5 years ago | 1

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Answered
Finding position of main peak and difference between main peak and next peak in a 1d plot
x = linspace(0,10); y = 1.5*exp(-(x-2).^2) + 2*exp(-(x-7).^2*2.5) + exp(-(x-9).^2*5); [pks,locs] = findpeaks(y) [maxpk,...

5 years ago | 0

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Answered
string data in function
Perhaps something like this — data('Character Vector', pi, 42) data("String Variable", pi, pi) function data(a,b,c) displ...

5 years ago | 0

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Answered
Printing an error message if jacobi's method, does not converges.
One approach would be to set a limit on ‘itc’. If it fails to converge before ‘itc’ reaches some value (perhaps ‘iteration_limi...

5 years ago | 0

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Answered
Solve a system of two second-order differential equations using ode
Start by using the Symbolic Math Toolbox to set the equations up, then use odeToVectorField and matlabFunction to create an anon...

5 years ago | 0

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Answered
How to fit a log curve to a scatterplot?
If you have the Statistics and Machine Learning Toolbox, use the lsline funciton. Otherwise use polyfit and polyval. x =...

5 years ago | 0

Answered
The inbuilt code "bode " is not working
The same code works here, and runs without error, with either bode or bodeplot. I switched from bode to bodeplot because bode...

5 years ago | 1

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Answered
How to make a cross section of the 3D plot ?
Choose the appropriate ‘X’ and ‘Z’ (or ‘Y’ and ‘Z’) values from the matrix to get a cross-section. [X,Y,Z] = peaks(50); fi...

5 years ago | 2

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Answered
lsqcurvefit to estimate parameters in ODE15s
The problem is in the definition of ‘theta0’ and not including the initial conditions in ‘theta0’. Changing those produces — ...

5 years ago | 0

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Answered
Findpeaks from the excel data graph
To create a logical vector for ‘J’, just do: J = (x2>90 & x2<120); Then the reference to it works correctly. However there...

5 years ago | 0

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Answered
Filter data series on amplitude as a function of time
Try this — s = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/632075/data.txt'); t = linspace(0,n...

5 years ago | 0

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Answered
How to solve equation by iteration
One problem is that ‘Psi’ is used before it is defined. Preallocating fixes that, however it may not solve the larger problems....

5 years ago | 0

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Answered
Bifurcation Diagram will not graph
Plot the points — figure; ax(1) = axes; hold on xlabel ('k'); ylabel ('C'); xlim([-2 2]); ylim(...

5 years ago | 0

Answered
How do ı convert rad/sample to Hz?
Note that radians/sample is equivalent to the Nyquist frequency, one-half of the sampling frequency. In fvtool, click on the...

5 years ago | 1

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Answered
How to filter a signal with a transfer function?
The easiest approach is to first let the Control System Toolbox solve it, then realise it as a discrete filter using the numerat...

5 years ago | 0

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Answered
Vertical and horizontal line standard equations
The problem is that the axes are set to be limited to [0 1] while the lines are all negative. (The second line was originally c...

5 years ago | 0

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Answered
Matlab contour plot with color
Use the contourf function, and choose the colormap that most closely represents what you want (for shades-of-gray, the gray colo...

5 years ago | 0

Answered
plot 3D function
I have no idea what ‘plotn’ is. That aside, ‘X’, ‘Y’, and ‘u’ are all (40x40x40) matrices. To plot them as a mesh for exampl...

5 years ago | 0

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Answered
problem with the function y
Define it as a function. (This has been possible since R2012a.) syms x T(x) = taylor (asinh (x), x, 'Order' ,16); figure...

5 years ago | 1

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Answered
Issues with my Bifurcation Diagram
One problem is that ‘ax(1)’ does not have anything assigned to it, at least in the posted code. Fixing that makes the axes magi...

5 years ago | 0

Answered
read Barcode is showing error- Undefined function or variable 'readBarcode'.
According to the documentation, the readBarcode function was introduced in R2020a. The version posted is R2019a, so to use it...

5 years ago | 2

Answered
Quiver is not working about drawing vector field.
It appears to work correctly here — x = linspace(-2, 2, 40); y = linspace(-2, 2, 40); [X,Y] = meshgrid(x,y); Z = (x.^2 + Y....

5 years ago | 0

Answered
Invalid expression on using log(t) and [exp(t) * cos(t)] functions
There are too many parentheses in ‘V’. Also, it is necessary to use element-wise operations in the vector calculations. See ...

5 years ago | 0

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Answered
scatterplot with the datetime
One approach — Uz = unzip('https://www.mathworks.com/matlabcentral/answers/uploaded_files/630240/household_power_consumption_2...

5 years ago | 2

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Answered
X-ray diffraction (XRD) Base line removal
See if the detrend function will do what you want. (This appears to be a relatively straightforward application of it.) More ...

5 years ago | 7

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Answered
How do I detect the desired peaks
‘There are multiple data points between the peaks, so finding two maximas would not work.’ It would definitely help to have a...

5 years ago | 0

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Answered
Using datenum to calculate acceleration
I’m not certain that I understand in detail what you’re doing. Using datenum is likely the best option here. I experimented ...

5 years ago | 0

Answered
How to prevent readtable excluding rows with "NA"?
Try this — C1 = readcell('https://www.mathworks.com/matlabcentral/answers/uploaded_files/629630/exampletxt.txt'); VN = C1(1,:...

5 years ago | 0

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Answered
inverse of tan at 90 degree
A more robust approach would be atan2d, since it provides a 4-quadrant angle. y2 = 20; y1 = 10; x2 = 42; x1 = 42; The...

5 years ago | 0