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How simplify numeric symbolic fraction coefficients
This almost gets there, however vpa apparently does not work on anyting except integers, so not on decimal fractions. syms ...

5 years ago | 1

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Answered
How can I calculate the angles between a polygons vertices?
Try this — X_Y_Val = [0.29218, 0.17609 0.56518, 0.27635 0.69555, 0.16324 0.83819, 0.4948...

5 years ago | 1

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Answered
Start Geoscience with MATLAB
Given your background, visit the Geophysics faculty in the Geosciences school in your university. They should be ablle to guide...

5 years ago | 0

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How to find all the intersections where multiple lines cutting a curve?
It would help to have the curve coordinates. Try this — t = linspace(0, 2*pi, 150); ...

5 years ago | 0

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Minor x-ticks not appearing.
It’s plotting a duration array, so there actually are no minor ticks. Likely the only way to deal with that is to change the 'X...

5 years ago | 1

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Answered
Some data not showing up
All the data are there, and are visible with sufficient scrolling. For example — Data = randi(9, 7, 3, 4) Scroll down t...

5 years ago | 1

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Need help setting up the piece-wise functions for Fourier transfer in MATLAB
Since the homework problem specifies symbolic calculations, the piecewise funciton could be appropriate here. .

5 years ago | 0

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Calculate R^2 of two graphs
One approach — x = linspace(0.1, 85, 50); % Create Data y = atanh((x-mean(x))/ma...

5 years ago | 0

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Outer edges on a patch surface
One option could be contour3. .

5 years ago | 0

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Pulling a column from a matrix to a vector
Try this — M = [1 0.318524 5 2 0.534064 4 3 0.0899507 3 4 0.111706 2 5 0.136293 1]; vector1 = M(:,1) And so for the ...

5 years ago | 1

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Answered
how to extract the data for specific interval?
I am not exactly certain what the desired result is, however the retime funciton will likely produce it, regardless. Assuming...

5 years ago | 0

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Answered
preparing symbolic ODE for ode45
Try something like this — syms gamma(t) T Y C1 = 2.4 C2 = 3.1 ode = diff(gamma, t, 2) == C1 * sin(gamma) + C2 * cos(diff...

5 years ago | 0

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Answered
find local minima within a time window of interest
To find the minimum using findpeaks, multiply the first argument (‘y’) by -1 so the minimum becomes a maximum. Do not use the s...

5 years ago | 0

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I want to find the position of cells with a specific content, but the empty cells are not counted, so I take a wrong result of position
The ‘b’ variable will contain the numeric indices from the logical vector that ismember returns, so ‘a{b,1}’ should return the d...

5 years ago | 0

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Finding a change in a variable due to a change in another variable
See if the griddedInterpolant function will produce the desired result p=200:1000; t=210:305; [P,T] = ndgrid(p,t); Z = T.*...

5 years ago | 0

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Answered
matrix, value, comparing
One option is pdist2 — MA = [0 4.4710 8.8828 13.6977 17.7027 21.7184]; TA = [0 5.0490 9.3733 ...

5 years ago | 0

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SYMBOLIC integration often gives complex integrands
I have absolutely no idea what the actual question is, however a possible solution would be the assume function. Experiment! ...

5 years ago | 0

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Subs with 2 numbers returns a number
It is doing the substitution and the calculation at the same time, and providing the answer. Using symbolic arguments instead...

5 years ago | 0

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plotting values that comes from a if else loop
I am not certain what you are doing, so I cannot suggest specific changes. The ‘Prf’ value plots, however it is a scalar so t...

5 years ago | 0

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Legend with 15 colors
Try this — x = linspace(0, sqrt(300), 15); y = x; z = x(:)*y; figure surf(1:15, 1:15, z) grid on colormap(turbo(15))...

5 years ago | 1

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Answered
I need a picture of a graph similar to the one I posted
Add these calls after the surf call — colormap(turbo) shading('interp') The surf plot should then be close to what appears t...

5 years ago | 0

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How to create a colored, with three equally spaced rows of colors horizontally with a dimension of 6x5x3
Try this — yellow = [1,1,0]; orange = [0.8500,0.3250,0.0980]; pink = [1, 0.5, 0.8]; tci = cat (3,yellow,orange,pink); x ...

5 years ago | 2

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Answered
Log normal Distribution Equation
Since the objective is to use MATLAB for this eventually, see the documentation section on the Lognormal Distribution. .

5 years ago | 1

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Datetimes don't seem to be recognised
I’m not certain what you’re doing and I can’t run the posted code. I’m also not certain what the actual problem is. See if t...

5 years ago | 0

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how do you make a scatter plot with categorical data with connecting lines?
The data being used would help produce an appropriate response. The ‘connecting lines’ request eliminates scatter as an opt...

5 years ago | 0

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How to convolve signal and transfer function
Try this — t = linspace(0, 10) u = @(t) heaviside(t); Vin = @(t) u(t)-u(t-3); h = @(t) ( exp(-2*t)/6 ) + ( 3/16*exp(-t) )...

5 years ago | 1

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Answered
I want to read a text file that contains both text and numbers. How can I extract just certain values from it?
Try this — WingTable = readtable('FileName.txt', 'NumHeaderLines',4, 'VariableNamingRule','preserve') See the documentation f...

5 years ago | 1

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Answered
Poly with negative coefficients reverses the order
Use flip on the symbolic result instead — P=[1 -16]; %P = fliplr(P); %with or without it makes no difference syms x f =...

5 years ago | 1

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fsolve yields wrong answer
Give fsolve a complex initial estimate to get a complex root — F = @(x)((x-20.6667).^2+57.89); opts = optimoptions('fsolve'...

5 years ago | 0

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Answered
Plotting the parametric curve and its second derivative
Is that is necessary to subscript ‘k’ so that it is the same size as the other elements in the calculation — t = linspace(0...

5 years ago | 1

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