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How to exported formatted text and create files in array with specified variables ?
There are several ways to do this — VariantModel = compose('%c', 'A':'E') files = sprintf('''Model%c.$2k'' (or it may be .txt...

1 month ago | 0

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Issue with legend colours in scatter plots with tranparency set 'ON'
The legend function has at least two other undocumented outputs (those are all that I experimented with, anyway), that can chang...

1 month ago | 0

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How to add two different surface curves in a single plot?
Try this — ‘I want to add another surface to the same plot for the same data which is at z=1 and parallel to x- and y-axis.’ ...

1 month ago | 0

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connecting each data points in a bar graph with an error bar
Sure! The easiest way is probably to return the handles of the errorbar calls to get the ‘XData’, ‘YData’, ‘’YPOsitiveDelta’,...

1 month ago | 0

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Average data points of different X,Y range
You have too interpolate all the curves to a single common independent variable. Then you can average them. x1 = sort(rand(...

1 month ago | 0

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How to achieve symbolic numerical integration
Without knowing more about ‘chi’ and the characteristics of its integrated result, one option (especially if the integration lim...

1 month ago | 0

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High Frequency Noise baseline filter
Your data have broadband noise, so as might be expected, a frequency-selective filter is going to have very little effect. Prob...

1 month ago | 1

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How to interface symbolic solutions with numeric ode solvers
With an initially symbolic set of differential equations, the symbolic versions should not be part of a numerical integration. ...

1 month ago | 0

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How do I obtain the area of each contour on a contour3 plot?
I wrote some utility routines to get information from contour plots a while ago, and tweaked them for this project. The ap[proa...

1 month ago | 0

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How to plot direction of forces on a body with polar plots or similar?
I can’t figure out what you’re plotting. The data are vectors, so any sort of surface plot isn’t possible, and I don’t understa...

1 month ago | 1

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Can someone help me display the area bounded by the curve and the linear line. Pls see attached photo.
One approach — clear all; close all format shortG filename = 'GT+10-ubc-X-Axis - Static.csv'; T1 = readtable(file...

1 month ago | 0

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I want to find the least negative non positive number in a vector
Perhaps this — V = [-10 , -5 , -1 , -0.1 , 0 , 1 , 2 , 3 , 4 , 5] [Vmax,idx] = max(V(V<0)) V(idx) .

1 month ago | 1

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Answered
Plot Piecewise function graph
To do this in the Symbolic Math Toolbox, just write it essentially as in your original post — syms x f(x) = piecewise((-3*...

1 month ago | 0

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Surf plot from excel file
It would help to know what the data are, and what you want to do with the NaN values. That aside, just plot all but the firs...

1 month ago | 0

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How to Curvefit amplitude output of a spring-mass-damper system to find coefficients?
Try this — load('sampleData.mat') % whos objfcn = @(b,t) b(1) .* exp(b(2).*t) .* cos(2*pi*b(3)*t + b(4)) + b(5); Lvlm =...

1 month ago | 0

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Using string variable names for dot indexing
That approach can work, however it is necessary to put the variable name from the cell array in parentheses — varnames = {'rs...

1 month ago | 0

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Normalized graph not showing
The timeseries ‘out.Q_i_nd.Data’ is a 3D matrix. You need to use the squeeze function to remove the extra singleton dimensions. ...

1 month ago | 0

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I am trying to plot a graph of two variables z1 and z2 versus t. but for some values of t I am getting z2 values negative in a graph. How to make these z2 values zero?
One approach — z2 = randn(1,10) z2(z2<0) = 0 .

1 month ago | 0

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Want to truncate an array
There are a few options, including using the vpa function in the Symbolic Math Toolbox, and to use sprintf to display the values...

1 month ago | 0

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bug in sprintf 2024a, can't use other variable and just repeating the first variable
The residue funciton produces column vectors in its output. To use sprintf with them, concatenate them in a matrix and then tra...

1 month ago | 0

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Graph lines not showing
See if the yline function will do what you want.

1 month ago | 1

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Two sets of data with two date ranges and y-axis values
Try this — x1 = 1:250; y1 = 20*sin(2*pi*x1/100) + 20 + randn(size(x1))*5; x2 = 15:250; y2 = cos(2*pi*x2/150)*60 + 150 + ...

1 month ago | 1

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Parameters identification providing derivative
The differential equation needs to be integrated in order to use . This does not appear to be as straightforward as I would hav...

1 month ago | 1

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How to use values from excel file in genetic algorithm
Use the readmatrix function instead of readtable since there are no variable names. It produces a matrix that can be address...

1 month ago | 1

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How to do fft of a csv file to plot amplitude spectrum
See the documentation for both fft and nufft. One of those should apply to your problem. Another optioon is the pspectrum fu...

1 month ago | 0

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Parameter estimation of SEIHRDBP model
The time values are incorrect. The complete table of those values should be — Date Infected Death ____ ___...

1 month ago | 0

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Fitting an custom equasion where i only want to optimize specific parameters
You would need to supply pre-determined values for ‘sigk’, ‘h1’, ‘g1’, and ‘Dwir’ if you have them (you have already calculated ...

1 month ago | 1

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Grid in MIMO nyquist diagram
I am not certain what you want to do or how much of the documentation you have explored. Most of the Control System Toolbox a...

1 month ago | 1

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Fittype issue: unrealistic results and problems with upper and lower bounds
The bounds may not be set correctly. Note that while ‘a’ is supposed to be between 0.1 and 1, your bounds for it are between 10...

1 month ago | 0

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Answered
Parameter estimation of SEIHRDBP model
Thank you for quoting my code! The problem was here: c0=theta(end-3:end); use this instead: c0=theta(end-7:end); Since m...

1 month ago | 0

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