Answered
Heat transient equation not executing
The terms in your series do not agree with the formula you posted. You must decide which one is correct and which one is wrong...

4 years ago | 0

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How to keep a specific value in binary matrix with column constraint?
@Maria Your last question was quite interesting - so I invested some time ... If A becomes larger, you will have to work with ...

4 years ago | 0

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How to solve a large symbolic system of equations with boundary conditions
Don't solve symbolically, but numerically if you plan to work with so many equations. clearvars; clc %--- Cantidad de elemento...

4 years ago | 1

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Why are the output variables, that I expect to be real, complex?
%Constant parameters% a = 0.005; %sheet half thickness% eps0 = 8.9*10^-12; %vacuum dielectric constant% eps_2 = 80; %water ...

4 years ago | 0

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Answered
Euler method table problem.Why my fprintf(y(i+1)) only has the last ans, my y1-y(i+1) is incorrect and how to let the table be tidy?
h=0.002; x=0:h:1; y=zeros(size(x)); y(1)=0; n=numel(y); y1=exp(x)-x-1; for i=1:n-1 f = x(i)+y(i); y(i+1) = y(i) ...

4 years ago | 1

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Parameter adjust for complex functions
fminsearch also works with functions, not only function handles. fun = @(f)FUN(f(1),f(2),f(3),f(4)); f10 = ...; f20 = ...; f...

4 years ago | 0

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Answered
I have a 1x6 array X = {‘a’,’b’,’c’,’d’,’e’,’f’}. I want a command that returns the element of X that contains a particular string. E.g. a command that if I tell it to find ‘d
str = ["asdfsd","bfgfd","cyf","ddfhf","effdg","dgdgdf"]; pat = "d"; [~,i] = find(contains(str,pat)==1)

4 years ago | 0

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Solving constrained differential equations
Solving the above system is only possible in the form M = [1 0 0 0 0; ... 0 m1 0 0 0; ... 0 0 1 0 0; ... 0 0 ...

4 years ago | 0

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Answered
Please how do I get rid of local variables may have been changed to match the globals error?
Can you take it from here for your case ? f = @(x,a) x.^2 + a.^2; x = -2:0.01:2; a = 0:0.1:1; array = zeros(numel(a),numel(x...

4 years ago | 0

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Answered
How do I add "internal" upper and lower bounds to the function lsqcurvefit?
The condition lambda_1 <= lambda_2 has to be set in A,b of the mimimizer "fmincon". "lsqcurvefit" is not suited in this case.

4 years ago | 0

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Answered
What is the pdf of Jakes' Model
You mean the equation of the pdf in the histogram ? theta = rand(1000000,1); v_max = 1.0; v = v_max*cos(theta); histogram(v,...

4 years ago | 0

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lsqcurvefit with custom equation
The saturation concentration for your model is 9.35e-4. So you will never reach 5.6e-3 as in your data. Note that the infinite ...

4 years ago | 0

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how to plot this equation
syms x y k f = y^3 + k^2*y^2 + k*y + 3; s = solve(f==0,y,'Maxdegree',3); s1 = sqrt(s); s2 = -sqrt(s); k = 0:0.1:10; s11 = ...

4 years ago | 0

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How to convert this equation to a matlab code?
It's written as it stands: a = 0.5*[1-zeta.^2,2-zeta.^2,1-alpha,2-alpha,1-beta,2-beta]; b = [1]; c = 0.5*[0,1]; d = 0.5*[-ze...

4 years ago | 1

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Answered
Solving a system of equations symbolically
Better ? syms F0 R1 R2 d1 d2 d12 thta thta12 m1 m2 assume(thta12,'real') assume(thta, 'real') assume(thta~=0) eq1=((F0/R1...

4 years ago | 0

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Answered
Unable to integrate a function using integral and vpaintegral
syms x theta = 6.3*pi/180; f = (1+cosh(2*theta*x))/sinh(2*pi*x)*tanh((pi-theta)*x); vpaintegral(f,x,0,Inf)

4 years ago | 0

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Answered
Changing for loop to backslash
A = [6 -1 0 0 0; -3 3 0 0 0; 0 -1 9 0 0; 0 -1 -8 11 -2; -3 -1 0 0 4]; b = [10:10:100;repmat([0; 160; 0; 0],1,10)]; dA = decomp...

4 years ago | 0

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Answered
my question is after ploting (x,y) , i want to count the number of signals that is above 0.5 at time for example : 1.05e-7, how to do that in matlab
xx = 1.05e-7; [~,i] = min(abs(x-xx)); count = nnz(y(i(1),:) > 0.5)

4 years ago | 1

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Fitting a hyperbola through a set of points
Remove the NaN value in the last position of data.P2 and data.I2: clear all; data=readtable("https://de.mathworks.com/matlabce...

4 years ago | 1

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How to segregate data according to its temperature value?
Use MATLAB's "discretize" for the temperature array and use the so received vector Y of bins to split the vector of water levels...

4 years ago | 0

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Options for solving a system of non-linear equations
"fsolve" is the only MATLAB tool to be used for this purpose.

4 years ago | 0

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Answered
How can I calculate the moments of an exponential random variable
syms mu x lower upper n assume(n,'integer') assume(n>0) lower = 0; upper = 5; mu = 3; f = 1/mu*exp(-x/mu) / int(1/mu*exp(-...

4 years ago | 0

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Data plot for different values
%store your outputs for each xi thetaxivalues(ixi,:,:) = theta(:,:); vxivalues(ixi,:,:) = v(:,:); What is ixi ? I guess, it's...

4 years ago | 0

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Answered
How to interchange position of a matrix?
Are you sure that the changes should be performed subsequently with the new vectors obtained from the steps before ? My guess ...

4 years ago | 1

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why error occurring in the program, i already define the z1 correctly i think?
Where do you define z1(1),z2(1),z3(1),z4(1),z5(1), x1(1),x2(1),x3(1),x4(1),x5(1), o1(1),o2(1),o3(1),o4(1),o5(1) needed to st...

4 years ago | 0

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How to find unknown y values from known x values on a graph with no clear line equation?
y_whole_number = interp1(x_experimental,y_experimental,(0:100))

4 years ago | 0

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Answered
how can i get a slope in the loglog plot?
ID = ...; dID = gradient(log10((1:600).'),log10(ID)); loglog(ID) hold on plot(log10((1:600).'),dID)

4 years ago | 0

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Answered
For loop for Covariance of two vectors
The covariance between two given vectors is a scalar, namely cov(x,y) = 1/(n-1) * sum_{i=1}^{i=n} (x(i)-mean(x))*(y(i)-mean(y))...

4 years ago | 0

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How to calculate rate constant if population vs time table data is given?
I assume N is given after 1 second each and starts at t=0 with N(0) = 1. t = 1:9; N = [2 3 4.5 7 10 16 29 56 104]; fun = @(p,...

4 years ago | 0

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Index exceeds the number of array elements. Index must not exceed 1.
In the expression CAn(i)=inct*((CA0-CA(i-1))/tresid-k*CA(i-1))+CA(i-1); , you reference CA as an array, but only CA(1) is defi...

4 years ago | 0